Indian Patents
Title of Invention

"A COMPOUND OF FORMULA (I)"
Abstract Described are spiroalkyl- and -alkenylketones and esters thereof, a method for their production and fragrance compositions comprising them.
Full Text ORGANIC COMPOUNDS
The present invention refers to a novel class of spiroalkyl- and -alkenylketones and esters thereof possessing damascone-like odour notes and to their use as odorants. This invention relates furthermore to a method for their production and for fragrance compositions comprising them.
In the fragrance industry there is a constant demand for new compounds that enhance, modify or improve on odour notes. Damascones, also known as rose ketones, constitute an important class of perfume ingredients. They display particular floral (rosy)-fruity notes reminiscent of dried fruits. Thus, there is a constant desire to find new compounds possessing a damascone-like odour note.
The present invention refers in one of its aspects to the use as fragrance of a compound of formula (I)
(Formula Removed)
wherein
n is 1, 2, 3, or 4;
m is 0 or 1;
R1 is selected from C1-C4 alkoxy (e.g. methoxy, ethoxy, propoxy, butoxy), C3-C4
cycloalkyloxy (e.g. cyclopropyloxy, methylcyclopropyloxy), C2-C4 alkenoxy (e.g.
allyloxy), C2-C5 alkyl (e.g. butyl, pentyl), C2-C5 alkenyl (e.g. prop-1-enyl, prop-2-enyl,
methylpropenyl), cyclopropyl, 2-methylcyclopropyl, 1-methylcyclopropyl, and
cyclopropylmethyloxy;
R2 is selected from hydrogen, methyl, ethyl, methylene, and ethylidene;
ring A is saturated, or unsaturated comprising 1 double bond (i.e. between C-1 and C-2,
C-2 and C-3, C-3 and C-4, or C-4 and C-5) or 2 double bonds (between C-1 and C-2
and C-3 and C-4, between C-1 and C-2 and C-4 and C-5, or between C-2 and C-3 and
C-4 and C-5); and
ring B is saturated, or unsaturated comprising 1 double bond or 2 double bonds.
The compounds of the present invention comprise several chiral centres and as such may exist as a mixture of stereoisomers, or they may be resolved as isomerically pure forms. Resolving stereoisomers adds to the complexity of manufacture and purification of these compounds, and so it is preferred to use the compounds as mixtures of their stereoisomers simply for economic reasons. However, if it is desired to prepare individual stereoisomers, this may be achieved according to methods known in the art, e.g. preparative HPLC and GC, crystallization or stereoselective synthesis.
Non-limiting examples are those compounds of formula (I) wherein m is 1, n is 1 or 3, and R2 is methyl.
Further non-limiting examples are compounds of formula (I) wherein m is 1, n is 1, R1 is prop-1-enyl and R2 is hydrogen or methyl, or compounds of formula (I) wherein m is 1, n is 1, R1 is methoxy or ethoxy, and R2 is methyl or methylene.
In particular embodiments are compounds of formula (I) selected from (E)-1-(7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (Ex. 1), methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (Ex. 2), ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (Ex. 3), allyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (Ex. 4), methyl 7-methylspiro[4.5]decane-6-carboxylate (Ex. 5), ethyl 7-methylspiro[4.5]decane-6-carboxylate (Ex. 6), 1-(7-methylspiro[4.5]decan-6-yl)butan-1-one (Ex. 7), 1-(7-methylspiro[4.5]dec-8-en-6-yl)butan-1-one (Ex. 8), (E)-1-(7-methylspiro[4.5]decan-6-yl)but-2-en-1-one (Ex. 9), (E)-1-(spiro[4.5]dec-6-en-6-yl)but-2-en-1-one (Ex. 10), (E)-1-(5-methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one(Ex. 11, 12), (E)-1-(5-methylspiro[2.5]oct-5-en-4-yl)but-2-en-1-one (Ex. 13), ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (Ex. 14 & 18), (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one (Ex. 15), (E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one (Ex. 15), ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate (Ex. 16), ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate (Ex. 16 & 22), ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate (Ex. 16), (2-methylcyclopropyl)(7-methylspiro[4.5]dec-8-en-6-yl)methanone (Ex. 17),
methyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (Ex. 25),
methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate (Ex. 26),
ethyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate (Ex. 27),
(E)-1 -(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1 -one,
methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate,
ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (Ex. 19),
(E)-1-(7-methylspiro[4.5]dec-9-en-6-yl)but-2-en-1-one (Ex. 21),
(E)-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)but-2-en-1-one(Ex. 31),
(E)-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)but-2-en-1-one(Ex. 33),
(E)-1 -(7-methylenespiro[4.5]dec-8-en-6-yl)but-2-en-1 -one (Ex. 32),
methyl 2-methylspiro[4.4]non-1-ene-1-carboxylate,
ethyl 2-methylspiro[4.4]non-1 -ene-1 -carboxylate,
(E)-1-(2-methylspiro[4.4]non-1-en-1-yl)but-2-en-1-one,
methyl 2-methylspiro[4.4]non-2-ene-1 -carboxylate,
ethyl 2-methylspiro[4.4]non-2-ene-1 -carboxylate,
(E)-1-(2-methylspiro[4.4]non-2-en-1-yl)but-2-en-1-one,
cyclopropyl(7-methylspiro[4.5]dec-8-en-6-yl)methanone,
(2-methylcyclopropyl)(7-methylspiro[4.5]deca-6,8-dien-6-yl)methanone,
cyclopropyl(7-methylspiro[4.5]deca-6,8-dien-6-yl)methanone,
methyl 7-ethylidenespiro[4.5]decane-6-carboxylate,
ethyl 7-ethylidenespiro[4.5]decane-6-carboxylate,
(2E)-1-(7-ethylidenespiro[4.5]decan-6-yl)but-2-en-1-one,
methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (Ex. 20),
methyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate (Ex. 23),
methyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate (Ex. 24),
ethyl 7-methylenespiro[4.5]decane-6-carboxylate (Ex. 28),
methyl 7-methylenespiro[4.5]decane-6-carboxylate (Ex. 29),
(E)-1-(7-methylenespiro[4.5]decan-6-yl)but-2-en-1-one (Ex. 30),
(E)-1-(spiro[4.5]deca-2,6-dien-6-yl)but-2-en-1-one (Ex. 34),
(E)-1-(7-methylspiro[4.5]deca-2,6-dien-6-yl)but-2-en-1-one,
(E)-1 -(7-methylspiro[4.5]deca-2,7-dien-6-yl)but-2-en-1 -one,
(E)-1 -(7-methylspiro[4.5]deca-2,8-dien-6-yl)but-2-en-1 -one,
(E)-1-(7-methylenespiro[4.5]dec-2-en-6-yl)but-2-en-1-one, and
(E)-1-(7-methylspiro[4.5]deca-2,6,8-trien-6-yl)but-2-en-1-one.
The compounds according to the present invention may be used alone or in combination with known odorant molecules selected from the extensive range of natural and synthetic molecules currently available, such as essential oils and extracts, alcohols, aldehydes and ketones, ethers and acetals, esters and lactones, macrocycles and heterocycles, and/or in admixture with one or more ingredients or excipients conventionally used in conjunction with odorants in fragrance compositions, for example, carrier materials, and other auxiliary agents commonly used in the art, e.g., solvents such as dipropylen glycol, isopropylmyristate, and triethylcitrate.
The following list comprises examples of known odorant molecules, which may be combined with the compounds of the present invention:
- essential oils and extracts, e.g. oak moss absolute, basil oil, tropical fruit oils, such as bergamot oil and mandarine oil, mastic absolute, myrtle oil, palmarosa oil, patchouli oil, petitgrain oil, wormwood oil, lavender oil, rose oil, jasmin oil, ylang-ylang oil and sandalwood oil.
- alcohols, e.g. cis-3-hexenol, cinnamic alcohol, citronellol, Ebanol®, eugenol, farnesol, geraniol, menthol, nerol, rhodinol, Super Muguet™, linalool, phenylethyl alcohol, Sandalore®, terpineol and Timberol®(1-(2,2,6-Trimethylcyclohexyl)hexan-3-ol).
- aldehydes and ketones, e.g. citral, hydroxycitronellal, Lilial®, methylnonylacetaldehyde, anisaldehyde, allylionone, verbenone, nootkatone, geranylacetone, a-amylcinnamic aldehyde, Georgywood™, hydroxycitronellal, Iso E Super®, Isoraldeine® (methylionone), Hedione®, maltol, methyl cedryl ketone, and vanillin.
- ethers and acetals, e.g. Ambrox®, geranyl methyl ether, rose oxide or Spirambrene®.
- esters and lactones, e.g. benzyl acetate, cedryl actetate, -decalactone, Helvetolide®, -undecalactone, vetivenyl acetate, cinnamyl propionate, citronellyl acetate, decyl acetate, dimethylbenzylcarbinyl acetate, ethyl acetoacetate, cis-3-hexenyl isobutyrate, linalyl acetate and geranyl acetate.
- macrocycles, e.g. ambrettolide, ethylene brassylate or Exaltolide®.
- heterocycles, e.g. isobutylquinoline.
The compounds of the present invention may be used in a broad range of fragrance applications, e.g. in any field of fine and functional perfumery, such as perfumes, household products, laundry products, body care products and cosmetics. The
compounds can be employed in widely varying amounts, depending upon the specific application and on the nature and quantity of other odorant ingredients. The proportion is typically from 0.0001 to 2 weight percent of the application. In one embodiment, compounds of the present invention may be employed in a fabric softener in an amount of from 0.0001 to 0.005 weight percent. In another embodiment, compounds of the present invention may be used in an alcoholic solution in amounts of from 0.01 to 3 weight percent, more preferably between 0.5 and 2 weight percent. However, these values are given only by way of example, since the experienced perfumer may also achieve effects or may create novel accords with lower or higher concentrations, e.g. up to about 20 weight percent based on the fragrance composition.
The compounds of the present invention may be employed into the fragrance application simply by directly mixing the fragrance composition with the fragrance application, and/or they may, in an earlier step, be entrapped with an entrapment material such as polymers, capsules, microcapsules and nanocapsules, liposomes, film formers, absorbents such as carbon or zeolites, cyclic oligosaccharides and mixtures thereof, and/or they may be chemically bonded to substrates, which are adapted to release the fragrance molecule upon application of an external stimulus such as light, enzyme, or the like, and then mixed with the application.
Thus, the invention additionally provides a method of manufacturing a fragrance application and consumer products resulting therefrom. The method comprises the incorporation therein of a compound of formula (I) as a fragrance ingredient, either by directly admixing the compound to the application or by admixing a fragrance composition comprising a compound of formula (I) or a precursor thereof, which may then be mixed to a fragrance application, using conventional techniques and methods. Through the addition of an olfactory acceptable amount of a compound of the present invention, the odour notes of a fragrance application will be improved, enhanced or modified.
By "precursors" is meant, in particular, reaction products of a compound of formula (I) with a compound comprising at least one functional group selected from the group of primary amine, secondary amine, sulfhydril (thiol), hydroxyl and carboxyl, in which a covalent bond is formed between at least one carbon atom of the compound of formula
(I) and at least one of the hetero atoms of said compounds comprising at least one functional group selected from the group of N, S and O.
In a further aspect, the invention provides a method for improving, enhancing or modifying a fragrance application through the addition thereto of an olfactory acceptable amount of a compound of formula (I), or a mixture thereof.
The invention also provides a fragrance application comprising:
a) as odorant a compound of formula (I) or a mixture thereof; and
b) a consumer product base.
As used herein, "fragrance application" means any consumer products, such as fine fragrances, e.g. eaux de perfume and eaux de toilette; household products, e.g. detergents for dishwasher, surface cleaner, air freshener; laundry products, e.g. softener, bleach, detergent; body care products, e.g. after-shave lotion, shampoo, shower gel, shower and bath salt, hygiene product; and cosmetics, e.g. deodorants, vanishing creams, comprising an odorant. This list of products is given by way of illustration and is not to be regarded as being in any way limiting.
As used herein, "consumer product base" means a composition for use as a consumer product to fulfill specific actions, such as cleaning, softening, and caring or the like. Examples of such products include fabric care and personal care products such as laundry care detergents, rinse conditioners, personal cleansing compositions. The composition may comprise a variety of active ingredients such as surfactants, polymers, fillers and auxiliary agents, such as dyes and solvents.
Most of the compounds of formula (I) are described hereinabove for the first time and thus are novel in its own right.
Accordingly, the present invention refers in a further aspect to compounds of formula (I)
(Formula Removed)
wherein
n is 1, 2, 3, or 4;
m is 0 or 1;
R1 is selected from C1-C4 alkoxy (e.g. methoxy, ethoxy, propoxy, butoxy), C3-C4
cycloalkyloxy (e.g. cyclopropyloxy, methylcyclopropyloxy), C2-C4 alkenoxy (e.g.
allyloxy), C2-C5 alkyl (e.g. butyl, pentyl), C2-C5 alkenyl (e.g. prop-1-enyl, prop-2-enyl,
methylpropenyl), cyclopropyl, 2-methylcyclopropyl, 1-methylcyclopropyl, and
cyclopropylmethyloxy;
R2 is selected from hydrogen, methyl, ethyl, methylene, and ethylidene;
ring A is saturated, or unsaturated comprising 1 double bond (i.e. between C-1 and C-2,
C-2 and C-3, C-3 and C-4, or C-4 and C-5) or 2 double bonds (between C-1 and C-2
and C-3 and C-4, between C-1 and C-2 and C-4 and C-5, or between C-2 and C-3 and
C-4 and C-5);
ring B is saturated, or unsaturated comprising 1 double bond or 2 double bonds;
provided that compounds of formula (I) wherein
m = 0, n = 4, R1 = ethoxy, R2 = hydrogen, and ring A comprises 1 double bond between
C-3 and C-4 (i.e. ethyl spiro[4.5]dec-3-ene-1-carboxylate);
m = 0, n = 1, R1 = ethoxy, R2 = hydrogen, and ring A comprises double bonds between
C-1 and C-2 and C-3 and C-4 (i.e. ethyl spiro[2.4]hepta-4,6-diene-4-carboxylate);
m = 0, n =1, R1 = methoxy, R2 = hydrogen, and ring a comprises double bonds between
C-1 and C-2 and C-3 and C-4 (i.e. methyl spiro[2.4]hepta-4,6-diene-4-carboxylate);
m = 0, n = 3, R1 = methoxy, R2 = hydrogen, and ring A is saturated (i.e. methyl
spiro[4.4]nonane-1-carboxylate);
m = 1, n = 3, R1 = tert-butoxy, R2 = hydrogen, and ring A is saturated (i.e. tert-butyl
spiro[4.5]decane-6-carboxylate);
m = 1, n = 4, R1 = methoxy, R2 = hydrogen, and ring A comprises a double bond
between C-4 and C-5 (i.e. methyl spiro[5.5]undec-4-ene-1-carboxylate)
are excluded.
The compounds of formula (I) are accessible from spiroolefines by acylation (Kondakov reaction) or from the corresponding spiroalkanones either by Rupe rearrangement via the corresponding tertiary alkynols, or by cyanide addition followed by water elimination and further transformations as shown in Scheme 1.
(Scheme Removed)
More specifically, compounds of formula (I) wherein m is 1 may be prepared by acid-catalyzed cyclization of cycloalkylidenylolefines, as shown in Scheme 2, a). Alternatively, cyclocondensation of alkylidenones with malonic acid derivatives allows the preparation of compounds according to formula (I), and of some of their double bond-isomers, and of more unsaturated analogues, as depicted in Scheme 2, b). Optionally the compounds of formula (I) wherein m is 1 may also be prepared, using the appropriated alkylidenone or 5-cycloalkylidene-2,2-dimethyl-1,3-dioxane-4,6-dione as dienophile in the presence of a diene, as shown in Scheme 2, c), followed by hydrolysis of the resulting compound.
Moreover, cyclic beta-ketoesters are also starting material for the synthesis of the compounds of formula (1) wherein m is 1 (see Scheme 3).
Spiroalkylketones and esters, i.e. compounds of formula (I) wherein ring A is saturated, are accessible by hydrogenation of the corresponding spiroalkenylketones and esters under conditions known to the person skilled in the art.
(Table Removed)
A further aspect of the present invention refers to the preparation of compounds of formula (I) comprising elimination of HX from a compound of formula (II) under acidic or basic conditions
(Formula Removed)
wherein n, m, R1 and R2 have the same meaning as given above for formula (I);
ring A is saturated, or unsaturated comprising 1 double bond (i.e. between C-1 and C-2,
C-2 and C-3, C-3 and C-4, or C-4 and C-5);
ring B is saturated, or unsaturated comprising 1 double bond or 2 double bonds; and
X is selected from -OR" wherein R" is selected from hydrogen, C1-C12 alkyl, or C1-C12
alkenyl, -O-C(O)R'" wherein R'" is C1 to C12 alkyl, or-O-CO2RlV wherein RIV is C1 to
C12 alkyl, and X is bound to C-2, C-3 or C-4.
Preferably compounds of formula (II) may be selected form the group wherein X is OH bound to C-2 or C-4, and ring A is saturated; or X is OH bound to C-2 and ring A comprises 1 double bond between C-3 and C-4, or X is OH bound to C-3 and ring A comprises 1 double bond between C-1 and C-2; or X is OH bound to C-4 and ring A comprises 1 double bond between C-2 and C-3.
The invention is now further described with reference to the following non-limiting examples. These examples are for the purpose of illustration only and it is understood that variations and modifications can be made by one skilled in the art.
Example 1: (E)-1-(rel-(6S.7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one and (EV
1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one
a) 3,3,15-Trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione
A mixture of 5-cyclopentylidene-2,2-dimethyl-1,3-dioxane-4,6-dione (194 g, 0.92 mol,
prepared from cyclopentanone and Meldrum acid in pyridine in the presence of
piperidine), 1,3-pentadiene (409 ml, 90%, 3.69 mol), and BHT (50 mg) was heated at
110°C for 42 h. The reaction mixture was then concentrated (95°C, 0.1 mbar) and the
residue (204 g) purified by thin film evaporation (at 180°C and 0.09 mbar, head
temperature: 85°C) giving the desired diester (177 g, 89% pure, 61% yield). Boiling point: 190°C(0.09 mbar).
1H-NMR (400MHz, CDCI3): δ5.67 {ddt, J = 2.9, 4.3, 10.1, 1 H), 5.54 (dq, J = 2.0, 10.1, 1
H), 3.23-3.14 (m, H-C(7')), 2.19-2.08 (m, 1 H), 2.06-2.02 (m, 2 H), 1.72 (br. s, MeCO),
1.69 (br. s, MeCO), 1.67-1.61 (m, 5 H), 1.54-1.46 (m, 1 H), 1.43-1.36 (m, 1 H), 1.08 (d,
J = 7.3, MeC(T)).
13C-NMR (100MHz, CDCI3): δ168.51 (s, CO), 165.77 (s, CO), 129.90 (d), 124.04 (d),
104.77 (s, CMe2), 61.44 (s, C(6')), 50.32 (s, C(5')), 36.76 (0, 35.92 (0, 34.61 (d, C(7')),
32.75 (0, 31.42 (q, MeCO), 27.86 (q, MeCO), 24.11 (0, 23.52 (t), 16.73 (q).
MS (El): 278 (1), 263 (1), 220 (5), 202 (14), 176 (20), 174 (12), 161 (37), 147 (29), 134
(12), 133 (16), 119 (65), 117 (21), 107 (29), 105 (54), 91 (100), 79 (32), 77 (29), 67
(18), 65 (17), 58 (22), 44 (25), 43 (55).
b) 1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)ethanone (trans) and 1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone (cis)
At-20°C, a solution of 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione (85 g, 80% pure, 244 mmol) in tetrahydrofuran (850 ml) was treated within 15 min. with methyllithium (427 ml, 1.6M in diethyl ether, 683 mmol). The resulting solution was warmed to 10°C by removing the cooling bath before being refluxed for 3 h, cooled at 0°C, poured into a mixture of 2N aqueous NaOH and ice, and extracted twice with methyl-tert-butyl ether (MTBE, 400 ml). The combined organic phases were washed with water, dried (MgSO4), and concentrated giving unreacted starting material (20 g, 46% pure). The aqueous phase was acidified with 2N aqueous HCI to pH 1 and extracted three times with MTBE (450 ml), washed twice with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated giving the crude intermediate ketoacid (52.2 g) which was refluxed in pyridine (520 ml) during 2 h. The resulting mixture was concentrated and the residue was poured into 2N aqueous HCI and ice, and extracted three times with MTBE (350 ml). The combined organic phases washed to pH 7, dried (MgSO4), and concentrated. Short-path distillation (bath temperature 110°C, head temperature: 70-85°C, 0.09 mbar) of the crude product (39.3 g) gave a diastereomeric mixture of the desired methyl ketones (30.7 g, 66%, rel-(6S,7R)/rel-(6R.7R) 30:70). Sodium (2.2 g, 96 mmol) was added to ethanol (300 ml) and the resulting solution was treated with a solution of 30:70 mixture of 1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone and 1 -(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-
6-yl)ethanone (30.7 g, 160 mmol) in ethanol (30 ml). The resulting solution was refluxed for 48 h, cooled to 0°C, poured into 2N aqueous HCI and ice, and extracted three times with MTBE (350 ml). The combined organic phases washed three times with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. Short-path distillation (bath temperature 110°C, head temperature 85°C, 0.09 mbar) of the crude product (32.9 g) gave a diastereomeric mixture of the desired methyl ketones (26.8 g, 87%, rel-(6S,7R)/rel-(6R,7R) 85:15). Boiling point: 80°C (0.09 mbar).
Data of 1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone (cis):
1H-NMR (400MHz, CDCI3): δ 5.69 (dquint, J = 2.6,10.0,1 H), 5.45 (dm, J = 10.0, 1 H),
2.64 (d, J = 6.3, H-C(6')), 2.57-2.48 (m, H-C(7')), 2.16 (s, MeCO), 2.10 (dm, J = 17.9,1
H), 1.82 (dm, J = 17.9,1 H), 1.72-1.28 (m, 8 H), 0.99 (d, J = 7.6, MeC(7')).
13C-NMR (100MHz, CDCI3): δ211.97 (s, CO), 129.57 (d, C(8')), 125.89 (d, C(9')), 60.48
(d, C(6')), 43.69 (s, C(5')), 38.86 (0, 38.61 (t), 34.06 (q, MeCO), 33.44 (t), 32.49 (d,
C(7')), 23.97 (0, 23.39 (0, 17.59 (q).
MS (El): 192 (14), 177 (6), 174 (4), 159 (3), 150 (13), 149 (100), 134 (21), 119 (16), 109
(17), 108 (27), 107 (29), 105 (24), 98 (25), 95 (22), 93 (41), 91 (43), 81 (51), 79 (35), 77
(22), 67 (26), 55 (14), 43 (50), 41 (19), 39 (11).
Data of 1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone (trans):
1H-NMR (400MHz, CDCI3): δ5.55 (dm, J = 10.2, 1 H), 5.49 (br. d, J = 10.5, 1 H), 2.56-
2.48 (m, H-C(7", H-C(6')), 2.22 (s, MeCO), 1.96 (br. dd, J = 4.8,17.6, 1 H), 1.91-1.81
(m, 2 H), 1.67-1.36 (m, 7 H), 0.91 (d, J = 6.6, WeC(7')).
13C-NMR (100MHz, CDCI3): δ213.73 (s, CO), 132.74 (d, C(8')), 124.42 (d, C(9')), 61.35
(d, C(6')), 44.79 (s, C(5')), 39.08 (t), 38.35 (0, 35.02 (q, MeCO), 32.79 (d, C(7')), 29.78
(t),24.25(0,23.44(t), 19.96(q).
1H-NMR (400MHz, C6D6): δ5.49-5.40 (m, H-C(8'), H-C(9')), 2.69-2.57 (m, H-C(7')), 2.25
(d, J = 10.1, H-C(6')), 2.23-2.13 (m, 1 H), 1.86 (s, MeCO), 1.75 (dm, J = 17.4,1 H), 1.64
(dsext, J = 2.0,17.4,1 H), 1.59-1.29 (m, 6 H), 1.18-1.10 (m, 1 H), 0.79 (d, J = 7.1,
MeC(7)).
13C-NMR (100MHz, C6D6): δ211.18 (s, CO), 132.95 (d, C(8')), 124.36 (d, C(9')), 60.81
(d, C(6')), 44.75 (s, C(5')), 39.22 (0, 38.40 (0, 34.60 (q, MeCO), 32.92 (d, C(7')), 29.83
(0,24.49(0,23.69(0, 19.77(q).
MS (El): 192 (15), 177 (2), 174 (2), 159 (1), 150 (12), 149 (100), 134 (14), 119 (13), 107 (21), 105 (17), 93 (26), 91 (26), 81 (48), 79 (23), 77 (14), 67 (21), 55 (10), 43 (35), 41 (13), 39 (7).
c) (E)-1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one and (E)-1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one
At -70°C, a solution of diisopropylamine (49.7 ml, 352 mmol) in tetrahydrofuran (200 ml) was treated with n-butyl lithium (224 ml, 1.6M in hexane, 358 mmol). The resulting solution was warmed to -30°C, cooled to -78°C, and treated with a solution of a 83:17 mixture of 1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone and 1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone (56.4 g, 290 mmol) in tetrahydrofuran (150 ml). The resulting solution was stirred 20 min. at -70°C and treated within 50 min. with a solution of acetaldehyde (82.8 ml, 1.47 mol) in tetrahydrofuran (100 ml). After 45 min. stirring, the reaction mixture was poured into an ice-cold saturated aqueous solution of NH4CI (400 ml) and extracted twice with MTBE (300 ml). The combined organic phases were washed with water (150 ml) and with a saturated aqueous solution of NaCI (250 ml), dried (MgSO4), and concentrated giving the desired intermediate ß-hydroxyketones as diasteromeric mixture (75.7 g) which was dissolved in acetic anhydride (58.2 ml, 616 mmol) and treated with sodium acetate (36.1 g, 440 mmol). The resulting mixture was heated at 80°C for 19 h, cooled to 20°C, poured into water and ice (400 ml), and extracted three times with MTBE (300 ml). The combined organic phases were washed three times with 2N aqueous NaOH solution, twice with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. Short-path distillation (bath temperature 60 to 180°C, head temperature 70-115°C, 0.09 mbar) of the crude product (87 g) over K2CO3 (1 g) gave a diastereomeric mixture of the desired butenones (50.5 g, 79%, rel-(6S,7R)/rel-(6R,7R) 80:20).
Data of (E)-1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (Boiling point: 114°C (0.13 mbar))
1H-NMR (400MHz, CDCI3): δ6.83 (dq, J = 6.8,15.7, H-C(3)), 6.23 (dq, J = 1.7,15.5, H-C(2)), 5.58-5.50 (m, H-C(8'), H-C(9')), 2.72 (d, J = 10.4, H-C(6')), 2.66-2.56 (m, H-C(7')), 2.00-1.85 (m, 3 H), 1.90 (dd, J = 1.6, 6.9, MeC(3)), 1.62-1.45 (m, 4 H), 1.45-1.36 (m, 2 H), 1.34-1.25 (m, 1 H), 0.86 (d, J = 7.1, MeC(7')).
13C-NMR (100MHz, CDCI3): δ204.31 (s, CO), 141.70 (d, C(3)), 135.01 (d, C(2)), 133.16
(d, C(8')), 124.32 (d, C(9')), 57.88 (d, C(6')), 45.11 (s, C(5')), 39.50 (t), 38.37 (0, 32.62
(d, C(7')), 30.02 (t), 24.39 (t), 23.62 (t), 19.96 (a), 18.22 (q).
MS (El): 218 (9), 203 (2), 149 (43), 135 (12), 134 (26), 121 (9), 119 (17), 107 (15), 106
(11), 105 (18), 93 (18), 91 (26), 81 (33), 79 (20), 77 (15), 69 (100), 55 (14), 41 (41), 39
(15).
Odour description: Damascone-like, fruity, floral.
Data of (E)-1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (Boiling point:
110°C(0.08mbar))
1H-NMR (400MHz, CDCI3): .56.79 (dq, J = 6.8, 15.6, H-C(3)), 6.22 (dq, J = 1.7, 15.5, H-
C(2)), 5.70 {dquint, J = 2.5,10.1, H-C(879*)), 5.48 (dm, J = 10.1, H-C(978')), 2.71 (d, J =
6.1, H-C(6')), 2.60-2.50 (m, H-C(7')), 2.13 (dm, J = 17.7,1H), 1.87 (dd, J = 1.8, 6.8,
MeC(3)), 1.81 (dm, J = 17.8,1H), 1.71-1.55 (m, 5 H), 1.47-1.32 (m, 2 H), 1.31-1.23 (m,
1 H), 0.94 (d, J = 7.6, MeC(7')).
13C-NMR (100MHz, CDCI3): δ202.58 (s, CO), 141.28 (d, C(3)), 134.19 (d, C(2)), 130.15
(d, C(8')), 125.92 (d, C(9')), 57.38 (d, C(6')), 44.12 (s, C(5')), 39.01 (0, 38.55 (0, 33.81
(0, 31.17 (d, C(7')), 24.06 (t), 23.24 (t), 18.14 (q), 17.76 (q).
MS (El): 218 (10), 203 (5), 189 (5), 149 (43), 135 (17), 134 (31), 124 (14), 123 (15), 122
(12), 121 (16), 119 (19), 109 (30), 107 (22), 106 (12), 105 (24), 93 (28), 91 (37), 81
(40), 79 (28), 77 (20), 69 (100), 55 (19), 41 (61), 39 (23).
Odour description: fruity, earthy, agrestic, green.
d)(E)-1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one At -70°C, a solution of diisopropylamine (0.5 g, 4.93 mmol) in tetrahydrofuran (4 ml) was treated with n-butyl lithium (3.3 ml, 1.6M in hexane, 5.14 mmol). The resulting solution was stirred at -70°C for 20 min. and treated with a solution of 1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)ethanone (0.79 g, 4.11 mmol) in tetrahydrofuran (4 ml). The resulting solution was stirred 20 min. at -70°C warmed to 0°C, cooled to -70°C, and treated with a solution of acetaldehyde (0.9 g, 20.5 mmol) in tetrahydrofuran (4 ml). After 20 min. stirring, the reaction mixture was warmed to -5°C, treated with a 1:1 mixture of a 2N aqueous HCI solution and saturated aqueous NaCI solution (25 ml) and extracted three times with MTBE (60 ml). The combined organic phases were washed
with a saturated solution of NaHCO3, with a saturated solution of NH4CI, and with water, dried (MgSO4), and concentrated. Fluid chromatography (FC, SiO2, hexane/MTBE 35:1) of the crude product (1.3 g) gave the desired intermediate ß-hydroxyketone (0.47 g, 1.98 mmol, 48%) which was dissolved in cyclohexane (1 ml). The resulting solution was treated with para-toluene sulfonic acid monohydrate (13 mg, 6.7 mmol) and refluxed 1.5 h. The reaction mixture was cooled to 0°C, treated with a saturated aqueous solution of NaHCO3 and the aqueous phase was extracted twice with MTBE. The combined organic phases were washed with water, dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 50:1) of the crude product (0.42 g) gave (E)-1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (0.34 g, 79%).
e) (E)-1-(rel-(6R,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one
FC (200 g SiO2, hexane/MTBE 30:1) of a crude 30:70 mixture of (E)-1-rel-(6S,7R)-7-
methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one and(E)-1-(rel-(6R,7R)-7-
methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (1.51 g) gave (E)-1-(rel-(6S,7R)-7-
methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (0.24 g, 16%) and (E)-1-(rel-(6R,7R)-7-
methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (0.48 g, 32%).
Example 2: rel-(6S.7R)-Methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate and rel-(6R,7R)-methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
In an autoclave, a mixture of 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione (100 g, 78% pure, 280 mmol) and copper powder (1.37 g, 21 mmol) in methanol (44.9 g, 1.4 mol) and pyridine (360 ml) was heated at 135°C for 48 h. The resulting mixture was concentrated and the residue poured into a mixture of 2N aqueous HCI and ice and extracted three times with methyl-tert-butyl ether (MTBE, 250 ml). The combined organic phases were washed with a saturated aqueous NaCI solution, dried (MgSO4), and concentrated. Short-path distillation (bath temperature 110°C, head temperature: 60-80°C, 0.1 mbar) of the crude product (81 g) gave a diastereomeric mixture of the desired methyl ester (48.9 g, 84%, rel-(6S,7R)/rel-(6R,7R) 30:70). Boiling point: 80°C (0.12 mbar).
Odour description: fruity, floral, agrestic, Damascone-like
Data of rel-(6S,7R)-methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ5.55 (dquint, J = 2.4, 10.1, 1 H), 5.50
(dm, J = 10.1,1 H), 3.68 (s, MeO), 2.60-2.49 (m, H-C(7')), 2.25 (d, J = 10.6, H-C(6')),
2.00-1.83 (m, 3 H), 1.68-1.30 (m, 7 H), 0.94 (d, J = 6.8, MeC(7')).
13C-NMR (100MHz, CDCI3): δ175.49 (s, CO), 132.15 (d), 124.69 (d), 56.00 (d, C(6')),
51.09 (q, OMe), 43.97 (s, C(5')), 39.62 (t), 38.54 (t), 32.43 (d, C(7')), 30.47 (r), 24.87 (t),
24.44(0, 19.95(q).
MS (El): 208 (8), 193 (2), 177 (5), 176 (12), 149 (74), 148 (100), 141 (9), 133 (16), 119
(18), 107 (33), 106 (47), 105 (39), 93 (41), 91 (61), 81 (46), 79 (49), 77 (33), 68 (30), 67
(55), 59 (15), 57 (7), 55 (23), 41 (41).
Data of rel-(6R,7R)-methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.69 (dquint, J = 2.5,10.1, 1 H), 5.42 (dm, J = 10.1, 1 H),
3.62 (s, MeO), 2.57-2.47 (m, H-C(7')), 2.43 (d, J = 6.3, H-C(6')), 2.25 (dm, J = 17.7, 1
H), 1.81 (ddq, J = 1.6, 5.1, 17.7, 1 H), 1.71-1.61 (m, 4 H), 1.60-1.52 (m, 1 H), 1.52-1.43
(m, 1 H), 1.39-1.28 (m, 2 H), 0.99 (d, J = 7.3, MeC(7')).
13C-NMR (100MHz, CDCI3): δ173.84 (s, CO), 129.13 (d), 125.97 (d), 54.05 (d, C(6')),
50.64 (q, OMe), 43.44 (s, C(5')), 38.87 (t), 38.38 (t), 33.78 (0, 30.50 (d, C(7')), 24.00 (0,
23.73(0, 17.79 (q).
MS (EI): 208 (6), 193 (1), 177 (6), 176 (22), 149 (89), 148 (100), 141 (9), 133 (29), 119
(24), 107 (41), 106 (60), 105 (52), 93 (54), 91 (75), 81 (40), 79 (49), 77 (35), 68 (28), 67
(48), 59 (15), 57 (12), 55 (25), 41 (40).
Example 3: rel-(6S.7R)-Ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate and rel-(6R,7R)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
In an autoclave, a mixture of 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione (3 g, 10.8 mmol) and copper powder (53 mg, 0.83 mmol) in ethanol (3.6 ml, 61.7 mmol) and pyridine (22 ml) was heated at 120°C for 37 h. The resulting mixture was poured into a mixture of 2N aqueous HCI and ice and extracted three times with MTBE. The combined organic phases were washed with a saturated aqueous NaCI solution, dried (MgSO4), and concentrated. Ball-to-ball distillation (120°C, 0.1 mbar) of the crude product (2.3 g) gave a diastereomeric mixture of the desired ethyl ester (1.65 g, 69%, rel-(6S,7R)/rel-(6R,7R) 26:74). Boiling point: 87°C (0.13 mbar).
Odour description: Damascone-like, fruity, plum, floral, slightly agrestic
Data of rel-(6S,7R)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ5.55 (dquint, J = 2.4,10.1, 1 H), 5.42
(dm, J = 10.1,1 H), 4.19-4.08 (m, CH2O), 2.57-2.43 (m, H-C(7')), 2.22 (d, J = 10.4, H-
C(6')), 1.28 (t, J = 7.1, MeCH2O), 0.95 (d, J = 6.8, MeC(7')).
13C-NMR (100MHz, CDCI3): δ174.99 (s, CO), 132.21 (d), 124.65 (d), 59.83 (t, OCH2),
55.99 (d, C(6')), 43.94 (s, C(5')), 39.74 (t), 38.40 (t), 32.42 (d, C(7')), 30.50 (0, 24.94 (t),
24.51 (0,19.86 (q), 14.38(q).
MS (El): 222 (11), 207 (1), 193 (1), 177 (8), 176 (9), 149 (79), 148 (100), 141 (13), 139
(9), 134 (16), 133 (14), 119 (16), 107 (25), 106 (43), 105 (33), 93 (30), 91 (40), 81 (37),
79 (32), 77 (20), 73 (1), 67 (32), 55 (15), 45 (1), 41 (21).
Data of rel-(6R,7R)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.68 (dquint, J = 2.5, 10.1, 1 H), 5.42 (dm, J = 10.1, 1 H),
4.17-4.04 (m, CH2O), 2.58-2.46 (m, H-C(7')), 2.40 (d, J = 6.3, H-C(6)), 2.25 (dm, J =
17.9,1 H), 1.80 (ddq, J = 1.7, 5.1, 17.7, 1 H), 1.70-1.62 (m, 4 H), 1.60-1.46 (m, 2 H),
1.40-1.28 (m, 2 H), 1.24 (t, J = 7.1, MeCH2O), 1.00 (d, J = 7.6, MeC(7')).
13C-NMR (100MHz, CDCI3): δ173.27 (s, CO), 129.13 (d), 125.87 (d), 59.39 (t, OCH2),
54.07 (d, C(6')), 43.47 (s, C(5')), 38.76 (t), 38.40 (t), 33.82 (t), 30.52 (d, C(7')), 24.00 (t),
23.71(0, 17.73(q), 14.38 (q).
MS (El): 222 (9), 207 (1), 193 (1), 177 (9), 176 (24), 149 (91), 148 (100), 134 (10), 133
(30), 119 (21), 107 (30), 106 (55), 105 (45), 93 (39), 91 (53), 81 (31), 79 (34), 77 (22),
73 (1), 67 (27), 55 (14), 45 (1), 41 (18).
Example 4: rel-(6S.7R)-AIIyI 7-methylspiro[4,5]dec-8-ene-6-carboxylate and rel-(6R.7R)-allyl 7-methylspiro[4,5]dec-8-ene-6-carboxylate
In an autoclave, a mixture of 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione (3 g, 10.8 mmol) and copper powder (53 mg, 0.83 mmol) in allyl alcohol (4.2 ml, 61.4 mmol) and pyridine (22 ml) was heated at 135°C for 44 h. The resulting mixture was poured into a mixture of 2N aqueous HCI and ice and extracted three times with MTBE. The combined organic phases were washed twice with a saturated aqueous NaCI solution, dried (MgSO4), and concentrated. FC (SiO2, hexane/MTBE 40:1) of the crude product (2.41 g) gave a diastereomeric mixture of the desired allyl ester (1.49 g, 60%, rel-(6S,7R)/rel-(6R,7R) 31:69). Boiling point: 76°C (0.1 mbar).
Odour description: floral, woody, fruity, rosy, agrestic
Data of rel-(6S,7R)-methyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ5.93 (ddt, J = 5.8,10.6,17.2, 1 H), 5.55
(dquint, J = 2.4, 9.9,1 H), 5.50 {dm, J = 10.1,1 H), 5.34 (dq, J = 1.6, 17.3,1H), 5.24
(dq, J = 1.3, 10.6, 1 H), 4.60 (dtd, J = 1.3, 4.5, 5.8, CH2O), 2.27 (d, J = 10.4, H-C(6')),
0.95 (d, J = 6.8, MeC(7')).
13C-NMR (100MHz, CDCI3): δ174.67 (s, CO), 132.38 (d), 132.15 (d), 124.68 (d), 118.28
(0, 64.70 (t, OCH2), 56.01 (d, C(6')), 43.99 (s, C(5')), 39.68 (t), 38.44 (t), 32.49 (d,
C(7')), 30.54 (t), 24.91 (t), 24.48 (t), 19.91 fa).
MS (El): 234 (2), 193 (18), 177 (1), 176 (2), 165 (10), 149 (20), 148 (27), 147 (100), 133
(9), 119 (8), 107 (12), 106 (14), 105 (32), 93 (17), 91 (26), 81 (23), 79 (21), 77 (13), 74
(1), 67 (18), 55 (10), 41 (25).
Data of rel-(6R,7R)-methyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ5.92 (ddt, J = 5.8,10.4, 17.2, 1 H), 5.68
{dquint, J = 2.5,10.1,1 H), 5.43 (dm, J = 10.2,1 H), 5.32 (dq, J = 1.5, 17.2,1 H), 5.21
(dq, J = 1.4, 10.4, 1 H), 4.55 (dtd, J = 0.5, 1.3, 5.8, CH2O), 2.61-2.48 (m, H-C(7')), 2.45
(d, J = 6.6, H-C(6')), 1.01 (d, J = 7.6, MeC(7')).
13C-NMR (100MHz, CDCI3): δ172.95 (s, CO), 132.52 (d), 129.17 (d), 125.90 (d), 118.01
(0, 64.30 (t, OCH2), 55.12 (d, C(6')), 43.52 (s, C(5')), 38.84 (t), 38.40 (t), 33.79 (0, 30.58
(d, C(7')), 23.99 (0, 23.69 (0, 17.80 (q).
MS (El): 234 (6), 193 (7), 177 (5), 176 (22), 165 (7), 149 (37), 148 (63), 147 (100), 133
(21), 119 (16), 107 (20), 106 (36), 105 (52), 93 (27), 91 (46), 81 (29), 79 (29), 77 (19),
74(1), 67 (23), 55 (15), 41 (34).
Example 5: rel-(6S,7R)-methyl 7-methylspiro[4,5]decane-6-carboxylate and rel-(6R,7R)-methyl 7-methylspiro[4.5]decane-6-carboxylate
A solution of a 25:75 mixture of rel-(6S,7R)-methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate and rel-(6R,7R)-methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (1.1 g, 5.28 mmol) in ethanol (10 ml) was treated with 10% Pd/C (0.1 g) and hydrogenated (1 atm.) for 1.5 h. The resulting mixture was filtered and concentrated. FC (SiO2, hexane/MTBE 80:1) of the crude product (1.1 g) gave a diastereomeric mixture of the desired ester (0.82 g, 74%, rel-(6S,7R)/rel-(6R,7R) 30:70). Boiling point: 76°C (0.1 mbar).
Odour description: agrestic, fruity-floral, woody.
Data of rel-(6S,7R)-methyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ3.65 (s, CH3O), 2.00 (d, J = 11.1, H-
C(6')), 2.06-1.99 (m, 1 H), 0.82 (d, J = 6.3, MeC(7)).
13C-NMR (100MHz, CDCI3): δ175.34 (s, CO), 59.63 (d, C(6')), 50.84 (q, MeO), 45.12 (s,
C(5')), 40.03 (0, 39.81 (0, 34.26 (t), 33.00 (d, C(7')), 29.96 (0, 25.84 (r), 24.70 (0, 22.46
(t), 20.78 (q).
MS (El): 210 (6), 195 (1), 192 (1), 179 (14), 178 (80), 151 (15), 141 (4), 136 (40), 134
(25), 129 (29), 121 (18), 115 (6), 109 (30), 108 (21), 107 (24), 101 (62), 96 (62), 95
(94), 94 (38), 93 (40), 82 (47), 81 (88), 79 (48), 77 (24), 74 (13), 69 (47), 67 (100), 59
(22), 55 (62), 41 (69), 29(13).
Data of rel-(6R,7R)-methyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ3.62 (s, CH3O), 2.30 (d, J = 5.1, H-C(6')),
1.86 (tdd, J = 0.9, 4.0, 13.4, 1 H), 0.87 (d, J = 6.8, MeC(7)).
13C-NMR (100MHz, CDCI3): δ174.62 (s, CO), 55.84 (d, C(6')), 50.40 (q, MeO), 44.80 (s,
C(5')), 39.61 (0, 36.55 (0, 31.66 (t), 31.36 (d, C(7')), 28.81 (0, 24.32 (0, 23.74 (t), 22.64
(0, 20.24(q).
MS (El): 210 (7), 195 (1), 179 (14), 178 (79), 151 (21), 141 (32), 136 (48), 134 (20), 129
(25), 121 (19), 115 (13), 109 (42), 108 (25), 107 (25), 101 (50), 96 (58), 95 (100), 94
(36), 93 (50), 82 (40), 81 (92), 79 (49), 77 (26), 74 (11), 69 (40), 67 (92), 59 (22), 55
(66), 41 (70), 29 (14).
Example 6: rel-(6S.7R)-Ethyl 7-methylspiro[4,5]decane-6-carboxylate and rel-(6R.7R)-Ethyl 7-methylspiro[4,5]decane-6-carboxylate
A solution of a 1:2 mixture of rel-(6S,7R)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate and rel-(6R,7R)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (3.3 g, 16 mmol) in ethanol (30 ml) was treated with 10% Pd/C (0.4 g) and hydrogenated (20 bar) for 1.5 h. The resulting mixture was filtered and concentrated. FC (SiO2, hexane/MTBE 30:1) of the crude product (3.1 g) gave a diastereomeric mixture of the desired ester (2.90 g, 87%, rel-(6S,7R)/rel-(6R,7R) 1:2). Boiling point: 90°C (0.07 mbar).
Odour description: Damascone-like, fruity, floral, agrestic.
Data of rel-(6S,7R)-ethyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ4.12 (qd, J = 1.26, 7.1, CH2O), 2.06-1.99
(m, 1 H), 1.98 (d, J = 11.2, H-C(6')), 1.26 (t, J = 7.2, MeCH2O), 0.83 (d, J = 6.2,
MeC(T)).
13C-NMR (100MHz, CDCl3): δ174.84 (s, CO), 59.61 (of, C(6')), 59.22 (t, CH2O), 45.12
(s, C(5')), 39.91 (t), 39.87 (0, 34.31 (0, 32.11 (d, C(7')), 29.98 (0, 25.91 (t), 24.75 (t),
22.48 (0, 20.70 (qr), 14.34 (q).
MS (El): 224 (7), 209 (1), 195 (1), 179 (23), 178 (100), 160 (8), 155 (3), 151 (30), 143
(25), 136 (45), 134 (26), 127 (4), 121 (18), 115 (42), 109 (35), 108 (21), 107 (22), 96
(61), 95 (98), 94 (39), 93 (36), 88 (16), 87 (47), 81 (92), 79 (40), 77 (20), 69 (34), 67
(84), 55 (54), 41 (58), 29 (32).
Data of rel-(6R,7R)-ethyl 7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): selected signals: δ4.11 (q, J = 7.1, CH2O), 2.27 (d, J =4.8,
H-C(6')), 1.87 (tdd, J = 0.8, 4.2, 13.1, 1 H), 1.26 (t, J = 7.8, MeCH2O), 0.87 (d, J = 6.8,
MeC(7')).
13C-NMR (100MHz, CDCI3): δ174.13 (s, CO), 59.22 (t, CH2O), 55.89 (d, C(6')), 44.84
(s, C(5')), 39.51 (0, 36.59 (0, 31.71 (0, 31.39 (d, C(7")), 28.88 (0, 24.30 (t), 23.74 (t),
22.66(0, 20.18(q), 14.44(q).
MS (El): 224 (7), 209 (1), 195 (2), 179 (21), 178 (95), 160 (7), 155 (28), 151 (37), 143
(20), 136 (56), 134 (20), 127 (22), 121 (19), 115 (34), 109 (36), 108 (22), 107 (21), 96
(54), 95 (100), 94 (33), 93 (38), 88 (12), 87 (34), 81 (87), 79 (39), 77 (20), 69 (29), 67
(71), 55 (52), 41 (52), 29 (30).
Example 7:1 -(rel-(6S.7R)-7-methylspiro[4,5]decan-6-yl)butan-1 -one A solution of (E)-1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (2.0 g, 9.16 mmol) in ethanol (30 ml) was treated with 10% Pd/C (0.4 g) and hydrogenated (20 bar) for 1.5 h. The resulting mixture was filtered and concentrated. FC (SiO2, hexane/MTBE 50:1) of the crude product (1.9 g) gave 1-(rel-(6S,7R)-7-methylspiro[4.5]decan-6-yl)butan-1-one (0.75 g, 37%). Boiling point: 95°C (0.08 mbar).
Odour description: fruity, floral, woody, Damascone-like.
1H-NMR (400MHz, CDCI3): δ2.51 (ddd, J = 6.4, 8.3,17.9,1H), 2.33 (ddd, J = 6.1, 8.3, 17.9, 1H), 2.24 (d, J = 10.9, H-C(6')), 2.10-2.00 (m, 1 H), 1.80-1.28 (m, 14 H), 1.17-1.05 (m, 1 H), 0.99-0.83 (m, 1 H), 0.91 (t, J = 7.4, MeC(3)), 0.75 (d, J = 6.3, MeC(7')). 13C-NMR (100MHz, CDCI3): δ215.66 (s, CO), 64.48 (d, C(6')), 50.53 (0, 46.11 (s, C(5')), 40.15 (t), 39.53 (0, 34.82 (t), 32.69 (d, C(7')), 29.07 (0, 25.08 (0, 24.29 (0, 22.35 (r),20.75(q), 16.45(0, 13.75 (q).
MS (El): 222 (2), 204 (20), 189 (1), 179 (10), 151 (37), 136 (26), 126 (6), 121 (8), 113 (24), 109 (25), 95 (100), 83 (17), 81 (35), 71 (28), 69 (20), 67 (25), 55 (27), 43 (34), 41 (31).
Example 8:1 -(rel-(6S.7R)-7-methylspiro[4,5]dec-8-en-6-yl)butan-1 -one After argon bubbling, a mixture of benzene (70 ml) and water (0.15 ml) was treated with triphenylphosphine-cooper (l)-hydride hexamer (3.3 g, 1.68 mmol). The resulting mixture was stirred for five min., treated with a solution of (E)-1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (2 g, 9.16 mmol) in benzene (10 ml) and stirred for 2 h at 20°C. The reaction mixture was then stirred for 30 min under air, filtered, and concentrated. FC (SiO2, hexane/MTBE 70:1) of the crude product (4.07 g) gave 1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)butan-1-one (0.80 g, 40%). Boiling point: 100°C(0.08 mbar).
Odour description: floral, fruity, slightly woody, Damascone-like.
1H-NMR (400MHz, CDCI3): δ5.54 (dquint, J = 2.0, 10.0, 1 H), 5.49 (dm, J = 10.0, 1 H),
2.54 (ddd, J = 6.4, 8.3, 17.7, 1H), 2.58-2.48 (m, H-C(7')), 2.48 (d, J = 10.1, H-C(6')),
2.36 (ddd, J = 6.1, 8.3,17.7,1H), 1.99-1.88 (m, 2 H), 1.84 (dsext, J = 1.8,17.7,1 H),
1.67-1.33 (m, 9 H), 0.92 (t, J = 7.4, MeC(3)), 0.88 (d, J = 6.6, MeC(7)).
13C-NMR (100MHz, CDCI3): δ215.30 (s, CO), 132.96 (d, C(3)), 124.42 (d, C(2)), 60.55
(d, C(6")), 49.99 (0, 45.00 (s, C(5')), 39.03 (0, 38.25 (0, 32.83 (d, C(7')), 29.76 (0, 24.20
(0, 23.34 (0, 20.00 (q), 16.49 (0, 13.77 (q).
MS (El): 220 (5), 205 (1), 191 (1), 177 (3), 149 (100), 134 (14), 126 (4), 119 (10), 109
(9), 107 (17), 106 (10), 105 (14), 93 (22), 91 (22), 81 (45), 71 (51), 67 (16), 55 (11), 43
(36), 41 (23).
Example 9: (E)-1-(rel-(6R.7R)-7-Methylspiro[4,5]decan-6-yl)but-2-en-1-one
A solution of 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadec-13-ene-1,5-dione (11.3 g, 28 mmol) in ethanol (50 ml) was treated with 10% Pd/C (1.1 g) and hydrogenated (20 bar) for 1.5 h. The resulting mixture was filtered and concentrated. The crude 3,3,15-trimethyl-2,4-dioxadispiro[5.0.4.4]pentadecane-1,5-dione (10 g) was dissolved in THF (100 ml) and treated at -20°C within 15 min. with methyllithium (45 ml, 1.6M in diethyl ether, 71 mmol). The resulting solution was refluxed for 3 h, treated with methyllithium (10 ml, 1.6M in diethyl ether, 16 mmol), refluxed for 1 h, cooled, poured into a mixture of 2N aqueous NaOH and ice (300 ml), and extracted twice with methyl-tert-butyl ether (MTBE, 80 ml). The combined organic phases were washed with 2M aqueous NaOH (50 ml) and the aqueous phases were combined, acidified with cone. HCI to pH1 and extracted twice with MTBE (100 ml). The resulting organic phases were combined, washed with water, with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated giving the crude intermediate ketoacid (7 g) which was refluxed in pyridine (70 ml) during 4 h. The resulting mixture was poured into 2N aqueous HCI and ice (300 ml), and extracted twice with cyclohexane (100 ml). The combined organic phases were washed with 2M aqueous HCI (50 ml), with water (50 ml), with a saturated aqueous solution of NaCI (100 ml), dried (16 g MgSO4), and concentrated to give the crude 1-(rel-(6R,7R)-7-methylspiro[4.5]decan-6-yl)ethanone (4.44 g, 56%).
1H-NMR (400MHz, CDCI3): selected signals: δ2.60 (br. d, J = 4.0, H-C(6")), 2.15 (s,
MeCO), 1.85 (br. td, J = 3.6,13.1, 1 H), 1.83-1.72 (m, 1 H), 1.17 {dm, J = 12.7,1 H),
0.81 (d, J = 6.9, MeC(7')).
13C-NMR (100MHz, CDCI3): δ213.54 (s, CO), 60.95 (d, C(6')), 45.51 (s, C(5')), 39.21
(0, 36.62 (0, 36.39 (q, MeCO), 32.20 (d), 31.16 (0, 28.59 (0, 23.87 (t), 23.80 (t), 22.54
(t), 20.35 (q).
MS (El): 194 (5), 180 (1), 179 (3), 161 (6), 147 (8), 136 (46), 125 (51), 121 (13), 109
(27), 95 (100), 85 (30), 81 (39), 67 (41), 55 (35), 43 (74), 41 (33).
At-60°C, a solution of diisopropylamine (4.1 ml, 28.8 mmol) in tetrahydrofuran (30 ml) was treated with n-butyl lithium (18 ml, 1.6M in hexane, 28.8 mmol). The resulting solution was stirred at -30°C for 20 min., cooled to -70°C, and treated with a solution of crude 1-(rel-(6R,7R)-7-methylspiro[4.5]decan-6-yl)ethanone (4.3 g, 22 mmol) in tetrahydrofuran (10 ml). The resulting solution was stirred 45 min. at -70°C, and treated within 15 min. with a solution of acetaldehyde (5 ml, 88.5 mmol) in tetrahydrofuran (10 ml). After 2 h stirring, the reaction mixture was poured into 2N aqueous HCI and ice
(150 ml) and extracted twice with MTBE (100 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous NaCI solution (100 ml), dried (MgSO4), and concentrated. The crude product (5.5 g) was dissolved in toluene (60 ml). The resulting solution was treated with para-toluene sulfonic acid monohydrate (0.5 g, 2.8 mmol) and heated at 60°C for 1.5 h. The reaction mixture was cooled, poured into a cold saturated aqueous solution of NaHCO3 (100 ml) and the aqueous phase was extracted with MTBE (80 ml). The combined organic phases were washed with a saturated aqueous NaCI solution (80 ml), dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 30:1) of the crude product (5.5 g) gave (E)-1-(rel-(6R,7R)-7-methylspiro[4.5]decan-6-yl)but-2-en-1-one (1.6 g, 33%). Boiling point: 100°C (0.07 mbar).
Odour description: Damascone-like (fruity, floral, agrestic), earthy, slightly spicy.
1H-NMR (400MHz, CDCI3): δ6.74 (dq, J = 6.9, 15.5, H-C(3)), 6.14 {dq, J = 1.6, 15.5, H-
C(2)), 2.76 (br. d, J = 4.8, H-C(6')), 1.91 (dddd, J = 0.7, 3.9, 13.2, 13.4,1 H), 1.87 (dd, J
= 1.7, 6.8, MeC(3)), 1.85-1.75 (m, 1 H), 1.70-1.50 (m, 7 H), 1.44-1.15 (m, 6 H), 0.83 (d,
J = 7.1,MeC(7')).
13C-NMR (100MHz, CDCI3): δ204.34 (s, CO), 140.70 (d, C(3)), 135.99 (d, C(2)), 57.77
(d, C(6')), 45.81 (s, C(5')), 39.32 (t), 36.97 (0, 32.56 (d, C(7')), 31.82 (t), 29.05 (t), 24.14
(0, 23.94 (0, 22.73 (t), 20.44 (q), 18.08 (q).
MS (El): 220 (12), 205 (14), 202 (3), 191 (5), 187 (4), 178 (3), 177 (4), 151 (91), 138
(31), 136 (16), 125 (13), 123 (19), 121 (13), 111 (37), 109 (32), 95 (66), 84 (5), 81 (30),
79 (22), 69 (100), 67 (34), 55 (38), 41 (60).
Example 10: (E)-1-(Spiro[4,5]dec-6-en-6-yl)but-2-en-1-one At 5°C, a solution of lithium acetylide ethylene diamine complex (200 g, 2.17 mol) in THF (1 I) was treated dropwise with a solution of spiro[4.5]decan-6-one (196 g, 1.29 mol, prepared from cyclohexanone and 1,4-dibromobutane in the presence of potassium te/t.-butylate in toluene) in THF (0.8 I). The resulting mixture was stirred for 3 h at 20°C, poured into a saturated aqueous solution of NH4CI, acidified with cone. HCI and extracted three time with MTBE (500 ml). The aqueous phase was extracted twice with MTBE (150 ml) and the combined organic phases were washed twice with water (500 ml), once with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. Short-path vigreux-distillation (0.08 mbar, bath temperature: 140°C, head
temp.: 100-105°C) of the crude product (257 g) gave 6-ethynylspiro[4.5]decan-6-ol (180.8 g, 79%).
13C-NMR (100MHz, CDCI3): δ87.60 (s, CCH), 73.85 (s, C(6)), 72.38 (d, CCH), 50.23 (s, C(5)), 37.26 (t), 35.49 (br. 0, 34.89 (br. t), 32.83 (br. 0, 26.22 (0. 25.84 (t), 22.16 (br. 0, 21.75(t).
At 20-27°C, a solution of 6-ethynylspiro[4.5]decan-6-ol (180 g, 1 mol) in pyridine (1 I) was treated dropwise with POCI3 (207 g, 2 mol). The resulting mixture was heated for 5.5 h heating at 85-90°C, poured into ice and extracted twice with pentane (800 and 300 ml). The combined organic phases were washed twice with water (500 ml), with a saturated aqueous solution of NaCI (300 ml), dried (MgSO4), and concentrated. Short-path Vigreux-distillation (8 mbar, head temperature: 85°C) of the crude product (146 g) gave 6-ethynylspiro[4.5]dec-6-ene (122.9 g, 76%).
13C-NMR (100MHz, CDCI3): δ136.43 (d, C(7)), 128.92 (s, C(6)), 84.16 (s, CCH), 75.39 (d, CCH), 44.69 (s, C(5)), 38.62 (t, 2 C), 35.39 (t), 25.93 (t), 25.21 (t, 2 C), 19.58 (t)-MS (El): 160 (42), 145 (21), 132 (21), 131 (56), 118 (42), 117 (100), 115 (41), 104 (25), 103 (36), 91 (78), 78 (28), 77 (29), 67 (15), 65 (18), 63 (14), 51 (16), 41 (15), 39 (18).
A mixture of 6-ethynylspiro[4.5]dec-6-ene (120 g, 0.748 mol) and sulfuric acid (11.6 g) in acetic acid (500 ml) was heated for 2 h at 75°C, poured into ice, treated with 2N aqueous NaOH (10 ml) and extracted twice with MTBE (150 ml). The combined organic phases were treated with 2N aqueous NaOH (pH>7), washed with water (400 ml), with a saturated aqueous solution of NaCI (400 ml), dried (MgSO4), and concentrated. Short-path V/areux-distillation (0.08 mbar, head temperature: 85-90°C) of the crude product (125 g) gave 1-(spiro[4.5]dec-6-en-6-yl)ethanone (62 g, 46%).
13C-NMR (100MHz, CDCI3): δ200.07 (s, CO), 146.84 (s, C(6)), 141.38 (d, C(7)), 43.86 (s, C(5)), 38.70 (t, 2 C), 38.26 (t), 27.62 (q), 26.50 (t), 26.17 (t, 2 C), 19.17 (t). MS (El): 178 (11), 163 (9), 150 (4), 149 (8), 136 (15), 135 (100), 121 (9), 107 (14), 93 (26), 91 (22), 79 (22), 77 (17), 67 (20), 43 (31), 39 (7).
At -70'C, a solution of diisopropylamine (40.9 g, 0.4 mol) in tetrahydrofuran (200 ml) was treated within 10 min. with n-butyl lithium (271 ml, 1.6M in hexane, 0.437 mol). The
resulting solution was stirred at -40°C for 20 min., cooled to -78°C, and treated within 20 min. with a solution of 1-(spiro[4.5]dec-6-en-6-yl)ethanone (62 g, 0.35 mol). The resulting solution was stirred 20 min. at -70oC and treated with a solution of acetaldehyde (76.6 g, 1.75 mol) in tetrahydrofuran (100 ml). After 90 min. stirring, the reaction mixture was poured into a cold saturated aqueous solution of NH4CI (400 ml) and extracted twice with MTBE (400 and 200 ml). The combined organic phases were washed with a water (200 ml), and twice with a saturated solution of NaCI, dried (MgSO4), and concentrated to give the desired intermediate 3-hydroxy-1-(spiro[4.5]dec-6-en-6-yl)butan-1-one (97.8 g) which was dissolved in acetic anhydride (70 ml, 0.73 mol). The resulting solution was treated with sodium acetate (31.4 g, 0.383 mol), heated at 80°C for 8 h, treated with sodium acetate (10 g, 0.122 mol), heated at 80°C for 15 h, treated with sodium acetate (10 g, 0.122 mol), heated at 80°C for 2 h. The reaction mixture was cooled to 0°C, poured into ice/water and extracted three times with MTBE (200 ml). The combined organic phases were washed with 2N aqueous NaOH (300 ml), with a saturated aqueous NaCI solution (250 ml), dried (30 g MgSO4) and concentrated. Short-path Vigreux distillation (0.08 mbar, bath temperature 140-180°C, head temperature: 80-146°C) of the crude product (89.6 g) followed by distillation (0.08 mbar, bath temperature 150-180°C, head temperature: 98°C) using a microdistillation column (20 x 1.5 cm, filled with 3x3 mm rolled wire netting) gave (E)-1-(spiro[4.5]dec-6-en-6-yl)but-2-en-1-one (55.6 g, 58%).
Odour description: fruity, Damascone-like, agrestic, tobacco.
1H-NMR (400MHz, CDCI3): δ6.76 (dq, J = 6.8, 15.3, H-C(3)), 6.52 (t, J = 3.9, H-C(7')), 6.46 {dq, J = 1.5, 15.3, H-C(2)), 2.19 (dt, J = 4.0, 6.2, 2 H), 2.05-1.95 (m, 2 H), 1.88 (dd, J = 1.7, 7.0, MeC(3)), 1.85-1.74 (m, 2 H), 1.67-1.57 (m, 4 H), 1.51-1.46 (m, 2 H), 1.41-1.33 (m, 2 H).
13C-NMR (100MHz, CDCI3): δ194.65 (s, CO), 146.57 (s), 142.40 (d), 137.81 (d), 130.57 (d), 44.23 (s, C(5')), 38.53 (t, 2 C), 37.47 (t), 25.89 (0, 25.83 (r, 2 C), 19.16 (t), 18.21
(q)-
MS (EI): 204 (17), 189 (100), 186 (7), 175 (32), 171 (9), 162 (15), 161 (38), 147 (43), 135 (30), 134 (17), 133 (29), 129 (10), 119 (17), 107 (20), 105 (28), 95 (21), 93 (31), 91 (61), 81 (16), 79 (37), 77 (36), 69 (57), 67 (35), 55 (22), 41 (71), 39 (32).
Example 11: (E)-1-(rel-(4R.5R)-5-methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one
a) 1-Ethoxycyclopropanol/1-methoxycyclopropanol
A solution of (1-ethoxycyclopropyl)oxy-trimethylsilane (25 ml, 124.9 mmol) in methanol (60 ml) was treated with conc. HCI (3 drops), stirred at 20°C for 16 h, concentrated at 20°C, and the residue distilled (55°C, 19-20 mbar) to give 1-ethoxycyclopropanol/1-methoxycyclopropanol (92:8,10.36 g, 82%).
1H-NMR (400MHz, CDCI3): data of 1-Ethoxycyclopropanol: δ3.76 (q, 2H, J = 8.0, OCH2), 3.44 (s, OH), 1.21 (t, 3H, J = 8.0, Me), 0.96-0.89 (m, 4 H).
b) 1 -Cyclopropylidenepropan-2-one
Under N2, a mixture of 1-ethoxycyclopropanol/1-methoxycyclopropanol (92:8, 10.36 g, 102.4 mmol), 1-triphenylphosphoranylidenepropan-2-one (38.84 g, 121.9 mmol) and benzoic acid (24 g, 10.2 mmol) in anhydrous benzene (500 ml) was refluxed for 20 h and then concentrated. The residue was filtered, and distilled (68°C, 40 mbar) giving 1-cyclopropylidenepropan-2-one (4.35 g, 45%).
1H-NMR (400MHz, CDCI3): δ6.47-6.43 (m, H-C(1)), 2.34 (s, Me), 1.54-1.48 {m, 2 H), 1.40-1.32 (m, 2 H).
13C-NMR (100MHz, CDCI3): δ198.8 (s, CO), 143.8 (s, C(1)=C), 121.6 (d, C(1)), 27.1 (q. Me), 5.1 (t), 2.6 (t).
c) rel-(4R,5R)-1 -(5-Methylspiro[2.5]oct-6-en-4-yl)ethanone
At 20°C under N2, a suspension of anhydrous ZnCI2 (0.31 g, 2.29 mmol) in Et2O (1.5 ml) was treated with 1,3-pentadiene (65% pure, 3.34 ml, 22.9 mmol) then with a solution of 1-cyclopropylidenepropan-2-one (0.44 g, 4.58 mmol) in Et2O (1,5 ml). After 24 h stirring, the resulting mixture treated with 6N aq. NaOH (3.1 ml) and the aqueous phase extracted three time with Et2O. The combined organic phases were washed twice with a saturated aqueous solution of NH4CI, once with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. FC (100 g SiO2, pentane/Et2O 10:0.5) of the crude product (1.12 g) gave rel-(4R,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (279 mg, 36%).
1H-NMR (400MHz, CDCI3): δ5.72-5.66 (m, 1 H), 5.62-5.57 {dm, 1 H), 2.68-2.58 (m, C(4)H), 2.48-2.39 {dm, 1 H), 2.16 (s, MeCO), 1.97 (d, J = 5.6, C(5)H), 1.32-1.24 {dm, 1 H), 1.05 (d, J = 7.6, C(5)Me), 0.67-0.64 (m, 1 H), 0.51-0.48 {m, 1 H), 0.40-0.32 {m, 2 H). 13C-NMR (100MHz, CDCI3): δ209.3 (s, CO), 131.1 (d), 125.3 (d), 58.6 (d, C(4)), 32.8 (t, C(8)), 31.9 (q, OCMe), 31.7 (d, C(5)), 17.9 (s, C(3)), 17.5 {q, C(5)Me), 14.8 (t), 11.2 (t). MS (El): 164 (10), 149 (14), 144 (3), 135 (5), 131 (9), 121 (72), 106 (27), 105 (29), 93 (87), 91 (100), 79 (59), 77 (48), 65 (15), 43 (98), 39 (22).
d)rel-(4R,5R)-1-(5-Methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one At -78°C under N2, a solution of diisopropylamine (2.57 ml, 18.2 mmol) in anhydrous THF (13.50 ml) was treated dropwise with a solution of 1.6M n-BuLi in hexane (11.40 ml, 18.2 mmol). The resulting solution was stirred 10 min. at 0°C, cooled to -78°C and treated dropwise with rel-(4R,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (2.3 g, 14.0 mmol, rel-(4R,5R)-/rel-(4S,5R)- 98:2) in anhydrous THF (2.2 ml). The resulting solution was stirred 1 h at -78°C, warmed to -20°C, cooled to -78°C and treated with a solution of acetaldehyde (4.40 ml, 70.1 mmol) in anhydrous THF (13.5 ml). The resulting solution was stirred for 15 min. at -78°C, warmed to -30°C, cooled to -78°C, and treated slowly with a mixture of 2N HCI (11.62 ml) and of a saturated aqueous solution of NaCI (7 ml). The mixture was then warmed to 0°C, the aqueous phase extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NaHCO3, a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, dried (Na2SO4) and concentrated to give 4.06 g of crude product. A solution of the crude product (2.92 g, 14.0 mmol) in toluene (85 ml) was treated with para-toluene sulfonic acid monohydrate (133.5 mg, 0.702 mmol) stirred at 80°C for 2 h, cooled, poured into a saturated aqueous solution of NaHCO3. The aqueous phase was extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, and concentrated. FC (500 g SiO2, hexane/Et2O 10:0.5) of the crude product (3.4 g) gave two fractions of rel-(4R,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one (Fraction 1: 0.613 g, 23%, 2 steps, rel-(4R,5R)-/rel-(4S,5R)- 93:7; Fraction 2: 1.36 g, 51%, 2 steps, rel-(4R,5R)-/rel-(4S,5R)- 99.3:0.7).
Odour description: agrestic, fruity, floral.
1H-NMR (400MHz, CDCI3): δ6.83-6.76 {dq, J = 7, J = 15.4, CH=CHMe), 6.24-6.18 {dq, J=1,6Hz, J = 15.2, CH=CHMe), 5.75-5.70 (m, 1H), 5.62-5.58 {d, J = 8, 1 H), 2.70-2.60 (m, C(4)H), 2.52-2.42 {dm, J = 18, 1 H), 2.14 {d, J = 5.6, C(5)H), 1.90-1.83 {dm, J = 5.2, CH=CHMe), 1.33-1.23 {dm, J = 18, 1 H), 1.02 {d, J = 7.6, C(5)Me), 0.65-0.58 {m, 1 H), 0.47-0.32 (m, 3 H).
13C-NMR (100MHz, CDCI3): δ200.4 (s, CO), 141.5 (of), 132.6 (d), 131.2 (d), 125.7 (d), 55.6 (d, C(4)), 32.9 {t, C(8)), 32.0 (d, C(5)), 18.0 (q), 17.7 (s, C(3)), 17.6 {q), 14.4 (t), 10.8(t).
Example 12: (E)-1-(rel-(4S.5R)-5-methylspiro[2,5]oct-6-en-4-yl)but-2-en-1-one: a) rel-(4S,5R)-1 -(5-Methylspiro[2.5]oct-6-en-4-yl)ethanone Na (22.7 mg, 0.987 mmol) was added to MeOH (24 ml). The resulting solution was treated at 25°C with rel-(4R,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (1.62 g, 9.97 mmol, prepared in example 11), and heated at 80°C for 64 h. The resulting solution was cooled, diluted pentane and poured into a saturated aqueous NH4CI solution. The aqueous phase was extracted twice with pentane and the combined organic phases were washed with a saturated aqueous NaCI solution, dried (Na2SO4) and concentrated. FC (250 g SiO2, pentane/Et2O 10:0.5) of the crude product (1.5 g) gave rel-(4S,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (930 mg, 57%) and a rel-(4R,5R)-1 -(5-methylspiro[2.5]oct-6-en-4-yl)ethanone / rel-(4S,5R)-1 -(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (60:40, 408 mg, 25%).
1H-NMR (400MHz, CDCI3): δ5.63 (d, J = 1.2, 2 H), 2.70-2.62 (m, H-C(4)), 2.22 (d, J =
5.6,1 H), 2.18 (s, MeCO), 1.86 {m, 2 H), 1.04 (d, J = 7.2, MeC(5)), 0.62-0.58 {m, 1 H),
0.48-0.41 (m, 2 H), 0.37-0.30 (m, 1 H).
13C-NMR (100MHz, CDCI3): δ209.95 (s, CO), 132.04 (d), 124.70 (d), 58.52 (d, C(4)),
35.04 {t, C(8)), 32.15 (d, C(5)), 31.23 {q, MeCO), 20.37 {q, C{5)Me), 15.99 (s, C(3)),
12.28(r),8.97(t).
b)rel-(4S,5R)-1-(5-Methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one At-78°C under N2, a solution of diisopropylamine (1.04 ml, 7.37 mmol) in anhydrous THF (2.2 ml) was treated dropwise with a solution of 1.6M n-BuLi in hexane (4.6 ml, 7.37 mmol). The resulting solution was stirred 10 min. at 0°C, cooled to -78°C and treated dropwise with a solution of rel-(4S,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)ethanone (930 mg, 5.67 mmol) in anhydrous THF (2.2 ml). The resulting solution was
stirred 10 min. at -78°C, warmed to -20°C, cooled to -78°C and treated with a solution of acetaldehyde (1.6 ml, 28.35 mmol) in anhydrous THF (2.2 ml). The resulting solution was stirred for 1 h at -78°C, warmed to -40°C, cooled to -78°C, and treated slowly with a mixture of 2N HCI (11.62 ml) and of a saturated aqueous solution of NaCI (7 ml). The mixture was then warmed to 0°C, the aqueous phase extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NaHCO3, a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, dried (Na2SO4) and concentrated to give 1.44 g of crude product. A solution of the crude product (1.41 g, 5.67 mmol) in toluene (28.4 ml) was treated with para-toluene sulfonic acid monohydrate (0.054 g, 0.284 mmol), stirred at 80°C for 1 h, cooled, poured into a saturated aqueous solution of NaHCO3. The aqueous phase was extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, and concentrated. FC (140 g SiO2, hexane/Et2O 10:0.5) of the crude product (1.19 g) gave rel-(4S,5R)-1-(5-methylspiro[2.5]oct-6-en-4-yl)but-2-en-1-one (0.69 g, 64%, 2 steps). Boiling point: 55°C (0.08 mbar).
Odour description: Damascone-like, fruity, floral, agrestic.
1H-NMR (400MHz, CDCI3): δ6.84 (dq, J = 6.8, 15.7, CH=CHMe), 6.19 (dq, J = 1.7, 15.7, CH=CHMe), 5.65 (dddd, J = 2.0, 2.8, 4.0, 10.0, 1 H), 5.59 (ddd, J = 2.0, 4.0, 10.1, 1 H), 2.74-2.62 (m, H-C(4')), 2.63 (d, J = 7.3, H-C(5')), 2.19 (dm, J = 17.9, 1 H), 1.90 (dd, J = 1.8, 6.8, CH=CHMe), 1.64 {dm, J = 17.9,1 H), 0.97 (d, J = 6.8, C(5')Me), 0.54 {dddd, J = 0.8, 4.3, 5.6,10.1,1 H), 0.41-0.30 (m, 2 H), 0.21 (br. ddd, 4.6, 5.6, 9.6, 1 H). 13C-NMR (100MHz, CDCI3): δ200.78 (s, CO), 142.27 (d), 132.82 (d), 132.53 (d), 124.99 (d), 54.86 (d, C(4')), 36.26 (t, C(8')), 32.58 (d, C(5')), 20.24 {q), 18.07 (q), 16.75 (s, C(3')), 10.80 (t),8.51 (t).
MS (El): 190 (1), 175 (6), 161 (5), 157(2), 147 (5), 121 (33), 106 (30), 105 (18), 93 (32), 91 (42), 79 (22), 77 (20), 69 (100), 41 (36), 39 (21).
IR: vmax2963, 2873, 1691, 1662, 1627, 1442, 1376, 1316, 1289, 1202, 1183, 1140, 1018, 1001, 970, 910, 875, 806, 695 cm-1.
Example 13: (E)-1-(5-methylspiro[2.5]oct-5-en-4-yl)but-2-en-1-one
At-78oC, a of solution of bis(cyclopentadienyl)zirconium dichloride (18.68 g, 63.9 mmol)
in THF (200 ml) was treated dropwise with a solution of 3M ethylmagnesium bromide in
Et2O (42.5 ml). The resulting mixture was stirred for 1 h at -78°C, warmed to 0°C, stirred at 0°C until the color of the solution turned red, and treated with a solution of 3-methylcyclohex-2-enone (7 g, 63.9 mmol) in THF (100 ml). After 3 h stirring at 20°C, the resulting mixture was concentrated. The residue was dissolved in dichloromethane (300 ml) and treated with TiCI4 (7.0 ml, 63.9 mmol). The resulting mixture was stirred for 20 min. and treated with a saturated aqueous solution of NH4CI. The aqueous phase was extracted with dichloromethane. The combined organic phases were washed with a saturated aqueous solution of NaHCO3, with a saturated aqueous solution of NaCI, and concentrated. FC (SiO2, pentane) of the crude product (9.53 g) gave 5-methylspiro[2.5]oct-4-ene (3.42 g, 44%).
1H-NMR (400MHz, CDCI3): δ4.74 (sext, J = 1.5, H-C(4)), 1.96 (tm, J = 6.3, 2 H), 1.77-1.70 (m, 2 H), 1.66 (dt, J = 1.0, 1.3, Me), 1.45-1.40 (m, 2 H), 0.50-0.40 (m, 4 H). 13C-NMR (100MHz, CDCI3): δ133.25 (s), 128.65 (d), 33.12 (t), 29.90 (t), 23.51 (q), 22.56 (0, 18.24 (s), 14.32 (t, 2 C).
A mixture of 5-methylspiro[2.5]oct-4-ene (1.41 g, 11.5 mmol), acetic anhydride (2.83 ml, 29.9 mmol), and zinc chloride (203 mg, 1.5 mmol) was heated at 50°C for 14.5 h, cooled to 20°C, poured into a mixture of a saturated aqueous solution of NaHCO3 and ice, and extracted with pentane. The aqueous phase was extracted twice with pentane and the combined organic phases were washed with a saturated aqueous solution of NH4CI, with a saturated aqueous solution of NaCI, dried (Na2SO4), and concentrated. FC (300 g SiO2, pentane/Et2O10:0.5) of the crude product (1.91 g) gave unreacted 5-methylspiro[2.5]oct-4-ene (765 mg) and 1-(5-methylspiro[2.5]oct-5-en-4-yl)ethanone (479 mg, 25%).
1H-NMR (400MHz, CDCI3): δ5.76-5.71 (m, H-C(6')), 2.20 (s, MeCO), 2.18-2.11 (m, 3
H), 2.10-1.99 (m, 1 H), 1.62 (dt, J = 0.7, 1.5, MeC(5')), 0.73 (dm, J = 13.0, 1 H), 0.61
(ddd, J = 0.5, 4.8, 9.6, 1 H), 0.45 {ddd, J = 4.7, 5.8, 8.9, 1 H), 0.36 (ddd, J = 4.3, 5.8,
9.1,1 H), 0.35-0.29 (m, 1 H),
13C-NMR (100MHz, CDCI3): δ210.07 (s, CO), 131.26 (s), 125.40 (d), 62.42 (d, C(4')),
29.46 (q), 28.00 (t), 24.38 (t), 22.95 (q), 18.07 (s, C(3')), 14.06 (t), 10.45 (t).
MS (El): 164 (1), 149 (2), 135 (1), 121 (100), 106 (8), 105 (23), 93 (85), 91 (58), 79 (58),
77 (37), 65 (11), 55 (13), 51 (9), 43 (42), 41 (13), 39 (16).
At -78°C under N2, a solution of diisopropylamine (0.53 ml, 3.72 mmol) in anhydrous THF (2.75 ml) was treated dropwise with a solution of 1.6M n-BuLi in hexane (2.33 ml, 2.75 mmol). The resulting solution was warmed to -10°C, cooled to -78°C, and treated dropwise with a solution of 1-(5-methylspiro[2.5]oct-5-en-4-yl)ethanone (470 mg, 2.87 mmol) in anhydrous THF (2.75 ml). The resulting solution was warmed to -20°C, cooled to -78°C and treated with a solution of acetaldehyde (0.81 ml, 14.3 mmol) in anhydrous THF (2.75 ml). The resulting solution was warmed to -10°C, cooled to -78°C, and treated slowly with a mixture of 2N HCI (6 ml) and of a saturated aqueous solution of NaCI (3.6 ml). The mixture was then warmed to 0°C, the aqueous phase extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NaHCO3, a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, dried (Na2SO4), and concentrated. The residue (596 mg) was dissolved in toluene (20 ml) and treated with para-toluene sulfonic acid monohydrate (27 mg, 0.143 mmol). The resulting solution was stirred at 80°C for 3 h, cooled, and poured into a saturated aqueous solution of NaHCO3. The aqueous phase was extracted three times with Et2O and the combined organic phases washed with a saturated aqueous solution of NH4CI, a saturated aqueous solution of NaCI, and concentrated. FC (200 g SiO2, hexane/Et2O 10:0.5) of the crude product (730 mg) gave (E)-1-(5-Methylspiro[2.5]oct-5-en-4-yl)but-2-en-1-one (0.354 g, 64%, 2 steps). Boiling point: 50°C (0.07 mbar).
Odour description: Damascone-like, fruity, floral, agrestic.
1H-NMR (400MHz, CDCI3): δ6.88 {dq, J = 7.0, 15.4, CH=CHMe), 6.35 (dq, J = 1.7,
15.4, CH=CHMe), 5.78-5.73 (m, H-C(6'), 2.35 (br. s, C(4')H), 2.19-2.11 (m, 2 H), 2.11-
2.02 (m, 1 H), 1.91 (dd, J = 1.6, 7.0 CH=CHMe), 1.61-1.59 (m, C(5')Me), 0.71 (br. dtd, J
= 0.8, 3.8, 12.9, 1 H), 0.60 (m, 1 H), 0.39-0.28 (m, 3 H).
13C-NMR (100MHz, CDCI3): δ200.54 (s, CO), 142.80 (d), 131.48 (s), 130.76 (d), 125.58
(d), 59.14 (d, C(4)), 28.05 (t), 24.45 (t), 23.00 (q), 18.54 (s, C(3)), 18.25 (q), 13.68 (0,
10.15(0.
Example 14: Ethyl 7-methylspiro[4,5]dec-7-ene-6-carboxylate a) At 35°C, a solution of vinylmagnesium bromide (0.8 mol, prepared from Mg and vinylbromide) in THF (268 ml) was treated within 1.5 h with a solution of cyclopentanone (47.5 ml, 0.534 mol) in THF (80 ml). The resulting mixture was refluxed
for 30 min., cooled to 35°C, treated with a saturated aqueous solution of NH4CI, and extracted with MTBE (300 ml). The organic phase was washed with a saturated aqueous solution of NaHCO3 (200 ml), with a saturated aqueous solution of NaCI (250 ml), dried (MgSO4) and concentrated. Vigreux-Distillation (0.1 mbar, bath temperature 60°C, head temp. 27°C) of the crude product (46.1 g) gave 1-vinylcyclopentanol (28.78 g, 48%).
In an autoclave under N2, a mixture of 1-vinylcyclopentanol (65 g, 0.58 mol), 2-methoxypropene (108 ml, 1.15 mol), 85% phosphoric acid (0.29 ml), triethylamine (0.63 ml) was heated at 130°C for 15 h. The reaction mixture was cooled to 20°C, diluted with MTBE (500 ml), washed three times with water (25 ml), once with a saturated aqueous solution of NaCI (25 ml), dried (MgSO4) and concentrated. Widmer-Distillation (0.13 mbar, head temp. 58°C) of the crude product gave 5-cyclopentylidenepentan-2-one (63.67 g, 72%).
A suspension of NaH (8.2 g, 55% in oil, 184 mmol, washed with hexane) in THF (300 ml) was treated dropwise within 1.5 h with a solution of triethylphosphonoacetate (35 ml, 176 mmol) in THF (40 ml). The resulting mixture was stirred for 1 h, treated dropwise with a solution of 5-cyclopentylidenepentan-2-one (25.48 g, 167 mmol) in THF (80 ml), heated at reflux for 20 h, cooled to 15°C, and treated with a saturated aqueous solution of NH4CI (150 ml). The aqueous phase was extracted with MTBE (80 ml) and the combined organic phases were washed twice with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4) and concentrated. Widmer-Distillation (0.08 mbar, head temp. 80-90°C) of the crude product (35.65 g, 67:24 E/Z) gave 84:16 (E/Z)-ethyl 6-cyclopentylidene-3-methylhex-2-enoate (24.7 g, 69%). Boiling point: 92°C (0.08 mbar).
IR: vmax2953, 2868, 1717, 1649, 1449, 1368, 1273, 1222, 1148, 1050, 862 cm-1.
(E)-ethyl 6-cyclopentylidene-3-methylhex-2-enoate
13C-NMR (100MHz, CDCI3): δ166.79 (s, CO), 159.77 (s), 144.15 (s), 118.38 (d), 115.49 (d), 59.34 (t, CH2O), 40.72 (0, 33.48 (t), 28.54 (t), 27.51 (t), 26.32 (0, 26.24 (t), 18.69 (q), 14.25(q).
(Z)-ethyl 6-cyclopentylidene-3-methylhex-2-enoate
13C-NMR (100MHz, CDCI3): δ166.22 (s, CO), 160.08 (s), 143.74 (s), 119.06 (d), 116.11 (d), 59.29 (t, CH2O), 40.72 (0, 33.20 (t), 28.42 (0, 28.26 (t), 26.34 (t), 26.28 (t), 25.23 (q), 14.25 (q).
b) At -20°C, cone, sulphuric acid (83 ml) was treated dropwise within 1 h with a solution of 84:16 (E/Z)-ethyl 6-cyclopentylidene-3-methylhex-2-enoate (20 g, 90 mmol) in diisopropyl ether (28 ml). The resulting mixture was poured into ice (140 g)/water (100 ml), diluted with MTBE (140 ml), washed three times with a saturated aqueous solution of NaHCO3 (70 ml), three times with a saturated aqueous solution of NaCI (70 ml), dried (MgSO4) and concentrated. Vigreux-Distillation (0.1 mbar, head temp. 80°C) of the crude product (18.3 g) gave ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (4.76 g, 24%). Boiling point: 90°C (0.1 mbar).
Odour description: fruity, floral, agrestic.
1H-NMR (400MHz, CDCI3): δ5.60-5.56 (m, H-C(8')), 4.18 (dq, J = 7.2, 10.9, CHO), 4.13
(dq, J = 7.1,10.9, CHO), 2.62 (br. s, H-C(6')), 2.15-2.03 (m, 2 H), 2.03-1.95 (m, 1 H),
1.65 (dt, J = 1.7, MeC(7')), 1.73-1.58 (m, 4 H), 1.58-1.41 (m, 2 H), 1.35-1.29 (m, 1 H),
1.27 (t, J = 7.1, MeCH2O), 1.30-1.21 (m, 2 H).
13C-NMR (100MHz, CDCI3): δ173.96 (s, CO), 130.11 (s, C(7')), 124.47 (d, C(8')), 60.13
(t, CH2O), 55.81 (d, C(6')), 43.78 (s, C(5')), 37.69 (0, 36.63 (t), 28.23 (0, 24.00 (t), 23.90
(0, 23.12 (0, 23.03 (q), 14.34 (q).
MS (El): 222 (31), 207 (2), 193 (1), 179 (3), 177 (2), 176 (9), 149 (98), 148 (100), 141
(18), 134 (12), 133 (11), 128 (14), 119 (9), 113 (13), 107 (21), 106 (30), 105 (28), 93
(23), 91 (29), 81 (31), 79 (20), 77 (13), 67 (15), 55 (6), 41 (9).
Example 15: (E)-1-[7-methylspiro[4,5]dec-7-en-6-yl)but-2-en-1-one and (E)-1-(7-methylspiro[4,5]dec-6-en-6-yl)but-2-en-1-one Method1
At 20°C, a solution of lithium diisopropylamine (9.3 ml, 2M in THF/heptane) was treated dropwise within 10 min. with a solution of allylmagnesium chloride (15 ml, 2 M in THF). The resulting mixture was heated at 33°C, treated dropwise with a solution of ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (6 g, 27 mmol) in THF (7 ml), stirred at 20°C for 1 h and at 40°C for 24h, treated with a mixture of allylmagnesium chloride (15 ml, 2 M in THF) and lithium diisopropylamine (9.3 ml, 2M in THF/heptane), stirred at 30°C for 2 h, poured into a mixture of a saturated aqueous solution of NH4CI (100 ml) and ice (115 g), and diluted with MTBE (200 ml). The organic phase was washed with 10% aqueous HCI (80 ml), with a saturated aqueous solution of NaHCO3 (80 ml), with a
saturated aqueous solution of NaCI (50 ml), dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 100:1 to 90:10) of the crude product (8.3 g) gave (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one and(E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one (1 g, 17%).
(E)-1-(7-Methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one
Boiling point: 115°C (0.09 mbar)
1H-NMR (400MHz, CDCI3): δ6.87 (dq, J = 6.9, 15.4, H-C(3)), 6.33 (dq, J = 1.7, 15.4, H-
C(2)), 5.63-5.59 (br. s, H-C(8')), 2.91 (br. s, H-C(6')), 2.19-2.01 (m, 2 H), 1.88 (dd, J =
1.7, 6.9, MeC(3)), 1.83 (ddd, J = 7.1, 10.5, 13.2,1 H), 1.68-1.56 (m, 4 H), 1.58-1.55 (br.
m, MeC(7')), 1.52-1.41 (m, 2 H), 1.35-1.29 (m, 1 H), 1.28-1.21 (br. dd, J = 6.0, 14.0, 1
H), 1.20-1.11 (m, 1 H).
13C-NMR (100MHz, CDCI3): δ202.17 (s, CO), 142.39 (d), 131.95 (d), 131.12 (s), 124.28
(d), 60.45 (d), 44.41 (s), 37.45 (0, 37.25 (0, 28.29 (t), 23.90 (0, 23.61 (q), 23.57 (t),
23.13(t), 18.32 (q).
MS (El): 218 (14), 203 (4), 189 (2), 175 (2), 161 (2), 149 (56), 135 (5), 121 (6), 119 (3),
107 (19), 106 (6), 105 (13), 93 (21), 91 (24), 81 (43), 79 (20), 77 (14), 69 (100), 55 (10),
41 (34), 39 (15).
Odour description: green, floral, rosy.
(E)-1-(7-Methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one
Boiling point: 117°C (0.1 mbar)
1H-NMR (400MHz, CDCI3): δ6.73 (dq, J = 6.9, 15.7, H-C(3)), 6.13 (dq, J = 1.6, 15.7, H-
C(2)), 1.97 (br. t, J = 6.3, 2 H), 1.91 (dd, J = 1.6, 7.0, MeC(3)), 1.77-1.35 (m, 12 H), 1.51
(s, MeC(7)).
13C-NMR (100MHz, CDCI3): δ202.8 (s, CO), 145.7 (d, C(3)), 139.0 (s, C(7')), 134.9 (d,
C(2)). 131.1 (s, C(6")), 45.1 (s, C(5')), 37.6 (t, C(1'), C(4')), 34.7 (t, C(10')), 31.0 (t,
C(8')), 23.9 (t, C(2'), C(3')), 21.5 (t), C(4)), 19.5 (t, C(9')), 18.4 (t), MeC(7')).
MS (El): 218 (46), 203 (74), 189 (37), 175 (46), 161 (51), 149 (100), 133 (29), 121 (18),
119 (22), 109 (25), 107 (40), 106 (8), 105 (45), 93 (39), 91 (68), 81 (32), 79 (43), 77
(41), 69 (65), 55 (31), 41 (83), 39 (35).
Odour description: green, floral, rosy, woody.
Method 2.
(E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one was prepared as described in the synthesis of (E)-1-(rel-(6S,7S)-7-methylspiro[4.5]dec-9-en-6-yl)but-2-en-1-one (Example 21) from ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (2.5 g, 11 mmol) by allylmagnesium chloride addition followed by treatment of the crude product with KOt-Bu in DMF leading to a mixture of (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-3-en-1-one and (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one that was treated with PTSA.H2O in toluene (2.5 h, 60°C) to give (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one (0.6 g, 24% overall yield) after FC.
Method 3.
(E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one. Spiro[4.5]decan-6-one was transformed in three steps into 7-methylspiro[4.5]decan-6-one by methoxycarbonylation (MeOCO2Me, NaH, THF, reflux, 93%) followed by methylation of the resulting ketoester (Mel, K2CO3, acetone, reflux, 2.5 d) and subsequent demethoxycarbonylation of the crude product (AcOH/H2O/H2SO410:4:3, reflux, 2h, 79%). The required intermediate 1-(7-methylspiro[4.5]dec-6-en-6-yl)ethanone was then prepared from 7-methylspiro[4.5]decan-6-one according to the Example 10 via 6-ethynyl-7-methylspiro[4.5]decan-6-ol (lithium acetylide ethylenediamine complex, THF, 2 h, 0-20°C, 75%, 78:22 diastereomeric mixture) and 6-ethynyl-7-methylspiro[4.5]dec-6-ene (POCI3, pyridine, 100°C, 19h, 45%) that was treated with AcOH/H2SO4 (20°C, 50 min., 34%) to give 1-(7-methylspiro[4.5]dec-6-en-6-yl)ethanone. Subsequent aldol condensation with acetaldehyde (LDA, THF; according to the Example 10) followed by treatment of the crude with acetic anhydride/sodium acetate (80°C, 5 h, 59%; according to the Example 10) gave (E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one.
7-methylspiro[4.5]decan-6-one
Boiling point: 57°C (0.09 mbar)
13C-NMR (100MHz, CDCI3): δ215.63 (s), 56.79 (s, C(5)), 41.98 (d), 40.48 (t), 36.50 (t),
36.39 (t), 34.16 (t), 25.37 (t), 24.81 (t), 22.78 (t), 15.01 (q).
6-ethynyl-7-methylspiro[4.5]decan-6-ol
MS (El): 192 (1), 191 (1), 177 (9), 166 (5), 164 (5), 163 (10), 159 (22), 151 (40), 149 (23), 145 (15), 135 (77), 131 (21), 125 (12), 121 (26), 117 (21), 110 (73), 108 (63), 97 (50), 95 (100), 93 (66), 91 (49), 82 (86), 81 (72), 79 (61), 77 (41), 67 (98), 55 (71), 53 (74), 41 (75), 39 (43).
6-ethynyl-7-methylspiro[4.5]dec-6-ene
1H-NMR (400MHz, CDCI3): δ3.03-3.02 (br. m, H-CC(6)), 2.01 (tm, J = 6.2, 0.9, 2 H),
1.97-1.86 (m, 1 H), 1.90 (m, Me), 1.76-1.53 (m, 7 H), 1.47-1.36 (m, 4 H).
13C-NMR (100MHz, CDCI3): δ143.25 (s, C(7)), 122.62 (s, C(6)), 82.87 (s, CCH), 80.16
(d, CCH), 45.02 (s, C(5)), 38.70 (t, 2 C), 35.41 (0, 31.72 (0, 25.17 (t, 2 C), 22.72 (a),
19.75(t).
MS (El): 174 (44), 159 (22), 146 (12), 145 (36), 132 (100), 131 (42), 117 (81), 115 (42),
105 (20), 103 (23), 91 (67), 79 (13), 77 (24), 67 (9), 65 (13), 53 (11), 51 (12), 41 (16),
39 (16).
1-(7-Methylspiro[4.5]dec-6-en-6-yl)ethanone
1H-NMR (400MHz, CDCI3): δ2.29 (s, MeCO), 1.95 (br. t, J = 0.6, 6.4, C(8)H2), 1.77-1.56
(m, 8 H), 1.60 (t, J = 0.9, MeC(7)), 1.52-1.40 (m, 4 H).
13C-NMR (100MHz, CDCI3): δ210.41 (s, CO), 142.38 (s), 129.15 (s), 44.62 (s, C(5)),
37.52 (t, 2 C), 34.87 (0, 33.61 (q), 30.89 (t), 24.10 (t, 2 C), 20.95 (q), 19.37 (t).
MS (El): 192 (3), 177 (9), 163 (7), 159 (2), 150 (18), 149 (100), 135 (16), 121 (7), 107
(17), 93 (18), 91 (18), 81 (13), 79 (15), 77 (12), 67 (9), 55 (8), 43 (32).
Example 16: Ethyl 7-methylenespiro[4,5]dec-8-ene-6-carboxylate, ethyl 7-methylspiro[4,5]deca-6,8-diene-6-carboxylate. and ethyl 7-methylspiro[4,5]deca-7.9-diene-6-carboxylate
a) Ethyl 7-methyl-9-oxospiro[4.5]dec-7-ene-6-carboxylate
A mixture of 1-cyclopentylidenepropan-2-one/ 1-cyclopentenylpropan-2-one (25:75, 100 g, 0.805 mol), ethyl acetoacetate (105 g, 0.805 mol), and zinc chloride (16.5 g, 0.12 mol) in heptane (100 ml) and benzene (100 ml) was refluxed for 6 days using a Dean-Stark apparatus. The resulting mixture was cooled, washed with water (250 ml), with a 5% aqueous solution of NaHCO3 (250 ml), with water, dried (MgSO4) and concentrated. Vigreux-Distillation (0.1 mbar, bath temperature 150°C, head temp. 106-130°C) of the crude product (174 g) followed by FC (SiO2, hexane/MTBE 10:1 to 5:1) gave ethyl 7-methyl-9-oxospiro[4.5]dec-7-ene-6-carboxylate (23 g, 12%).
1H-NMR (400MHz, CDCI3): δ5.95 (s, H-C(8")), 4.21 (t), J = 7.2, CHO), 4.20 (t), J = 7.2, CHO), 3.02 (s, H-C(6')), 2.90 (dd,, J = 0.5, 16.5, H-C(10')), 2.18 (br. d, J = 16.4, H-
C(10')), 1.96 (dd, J = 0.4,1.4, MeC(7')), 1.77-1.61 (m, 5 H), 1.58-1.39 (m, 3 H), 1.29 (t,
J = 7.1, MeCH2O).
13C-NMR (100MHz, CDCI3): δ199.14 (s, C(9')O), 170.60 (s, CO2), 155.65 (s, C(7')),
127.97 (d, C(8')), 61.11 (t, OCH2), 57.38 (d, C(6')), 46.64 (s, C(5')), 44.74 (t), 38.51 (t),
37.25 (0, 23.77 (t), 23.66 (t). 23.57 (q), 14.20 (q).
MS (El): 236 (19), 207 (1), 194 (18), 191 (21), 163 (33), 154 (88), 135 (18), 126 (83),
122 (29), 121 (37), 109 (22), 98 (100), 93 (26), 91 (43), 82 (7), 79 (26), 77 (32), 67 (21),
53 (23), 41 (21), 29 (31).
b) cis- and trans-Ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate A solution of ethyl 7-methyl-9-oxospiro[4.5]dec-7-ene-6-carboxylate (6.4 g, 27.3 mmol) in methanol (120 ml) was treated with anhydrous cerium trichloride (6.72 g, 27.3 mmol). The resulting mixture was stirred for 45 min., cooled to 0°C, and added within 40 min. to a mixture of sodium borohydride (0.75 g, 96%, 19.1 mmol) in methanol (60 ml) at 0°C. The resulting mixture was stirred for 2 h at 20°C, cooled to 0°C, treated with sodium borohydride (0.75 g, 96%, 19.1 mmol), stirred for 3 h at 20°C, cooled to 0°C, poured into 2N aqueous HCI and ice, and extracted three times with MTBE (200 ml). The combined organic phases were washed three times with a saturated aqueous solution of NaCI, dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 3:1) of the crude product (7.6 g, cis/trans 19:81) gave cis-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.82 g 13%), 29:71 cis-/trans-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.71 g, 11%), and trans-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (3.52 g, 54%).
c/s-Ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.72-5.70 (m, H-C(8')), 4.34-4.29 (m, H-C(9')), 4.20-4.08
(m, CH2O), 2.78 (br. s, H-C(6')), 2.29 (dd, J = 5.8,14.3, H-C(10')), 1.72 (td, J = 0.5,1.5,
MeC(7')), 1.77-1.50 (m, 8 H), 1.52 {dm, J = 14.5, H-C(10')), 1.36-1.28 (m, 1 H), 1.26 (t,
J=7.1,MeCH2O).
13C-NMR (100MHz, CDCI3): δ172.65 (s, CO2), 134.01 (s, C(7')), 126.41 (d, C(8')),
65.34 (d, C(9')), 60.40 (t, OCH2), 55.15 (d, C(6')), 43.25 (s, C(5')), 38.97 (0, 38.41 (t),
37.14 (t), 24.07 (0, 23.55 (0, 22.95 (q), 14.28 (q).
MS (El): 238 (6), 220 (5), 209 (28), 196 (5), 192 (8), 181 (10), 165 (55), 164 (64), 155
(15), 147 (86), 135 (32), 122 (93), 105 (100), 91 (50), 82 (22), 81 (30), 79 (39), 77 (34),
69 (23), 67 (31), 55 (32), 41 (33), 29 (35).
trans-Ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.66-5.63 {m, H-C(8')), 4.23-4.10 (m, H-C(9'), CH2O), 2.63
(br. s, H-C(6')), 2.24 (br. s, OH), 1.93 {dd, J = 9.9,12.5, H-C(10')), 1.75 {ddt, J = 1.0,
6.5, 12.5, H-C(10')), 1.74-1.58 {m, 4 H), 1.68 {tm, J = 0.5, 1.5, MeC(7')), 1.56-1.40 {m, 2
H), 1.40-1.30 {m, 2 H), 1.28 {t, J = 7.1, MeCH2O).
13C-NMR (100MHz, CDCI3): δ173.33 (s, CO2), 135.51 (s, C(7')), 128.82 (d, C(8')),
61.31 {d, C(9')), 60.48 (t, OCH2), 55.39 (d, C(6')), 45.66 (s, C(5')), 38.59 (0, 37.93 (0,
37.12 (0, 23.61 (0, 23.31 (0, 22.59 {q), 14.28 (qr).
MS (El): 238 (5), 220 (3), 209 (22), 196 (4), 192 (6), 181 (8), 165 (40), 164 (49), 155
(13), 147 (58), 135 (27), 122 (65), 105 (100), 91 (56), 82 (21), 81 (25), 79 (35), 77 (32),
69 (20), 67 (26), 55 (26), 41 (28), 29 (28).
c) Ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate, ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate, and ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate A solution of 35:65 cis-/trans-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.1 g, 0.42 mmol) in THF (1 ml) was treated with five drops of water and five drops of 20% sulphuric acid, heated at 100°C for 2 h, cooled to 20°C, poured into ice, and extracted with MTBE (20 ml). The organic phase was washed with a saturated aqueous solution of NaCI, dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 10:1) of the crude product (70 mg) gave a 77:11:11 mixture of ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate, ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate, and ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate (40 mg, 43%). Boiling point: 100°C (0.09 mbar). Odour description: fruity, floral.
Ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ6.17 {ddquint, J = 0.6, 2.2, 10.0, 1 H), 5.86-5.79 {m, 1 H),
5.00 (br. s, 1 H), 4.95 (br. s, 1 H), 4.11 {qd, 0.6, 7.2, CH2O), 3.04 (br. s, H-C(6')), 2.51
{dm, J = 18.1, 1 H), 1.92 (br. dd, J = 5.7, 18.1, 1 H), 1.75-1.54 {m, 5 H), 1.48-1.29 {m, 3
H), 1.24 (t, J = 7.1,MeCH2O).
13C-NMR (100MHz, CDCI3): δ172.69 (s, CO), 140.45 (s), 129.80 (d), 127.41 (d), 114.77
(t), 60.12 {t, OCH2), 55.73 (d, C(6')), 43.66 (s, C(5')), 38.41 (t), 37.53 (t), 35.15 (0, 24.44
(t), 24.13(t), 14.19 (q).
MS (El): 220 (5), 205 (1), 191 (1), 175 (2), 149 (3), 148 (10), 147 (81), 146 (20), 132 (3), 131 (15), 119 (9), 105 (100), 91 (24), 77 (15), 65 (7), 55 (5), 41 (9), 29 (11).
Ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate,
1H-NMR (400MHz, CDCI3): δ5.86-5.80 (m, 2 H), 4.24 (g, 7.2, CH2O), 2.16-2.13 (m, 2
H), 1.82 (s, MeC(7')), 1.73-1.55 (m, 8 H), 1.32 (t, J = 7.1, MeCH2O).
13C-NMR (100MHz, CDCI3): δ170.06 (s, CO), 133.08 (s), 132.10 (s), 128.74 (d), 128.33
(d), 59.99 (t, OCH2), 44.44 (s, C(5')), 36.64 (0, 35.77 (t, 2 C), 24.21 (t, 2 C), 19.60 (q),
14.32 (q).
MS (El): 220 (14), 205 (1), 191 (3), 175 (48), 149 (42), 148 (7), 147 (51), 145 (83), 132
(16), 131 (14), 119 (16), 105 (100), 91 (38), 77 (23), 65 (10), 55 (9), 41 (10), 29 (16).
Ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.80-5.74 (m, 2 H), 5.55 (br. d, J = 8.5, 1 H), 4.13 (dg, J =
7.1, 10.8, CHO), 4.10 (dg, J = 7.1, 10.8, CHO), 2.73 (s, H-C(6')), 1.80 (br. s, MeC(7')),
1.75-1.56 (m, 8 H), 1.24 (t, J = 7.1, MeCH2O).
1H-NMR (400MHz, C6D6): δ5.78 {dd, J = 5.3, 9.5, 1 H), 5.71-5.67 (m, 1 H), 5.56 (dm, J
= 0.8, 9.5,1 H), 3.97 (dg, J = 7.1,10.8, CHO), 3.92 (dg, J = 7.1,10.8, CHO), 2.80 (s, H-
C(6')), 1.80-1.77 (m, MeC(7')), 1.77-1.47 (m, 8 H), 0.95 (t, J = 7.1, MeCH2O).
13C-NMR (100MHz, CDCI3): δ171.87 (s, CO), 134.09 (d), 131.43 (s), 121.40 (d), 121.16
(d), 60.10 (t, OCH2), 55.16 (d, C(6')), 45.94 (s, C(5')), 39.93 (t), 35.87 (0, 23.92 (t),
23.06 (t), 22.79 (q), 14.23 (q).
13C-NMR (100MHz, C6D6): δ170.75 (s, CO), 134.40 (d), 131.48 (s), 121.58 (d), 121.35
(d), 59.67 (t, OCH2), 55.54 (d, C(6')), 45.98 (s, C(5')), 39.95 (t), 35.94 (t), 24.08 (0,
23.18 (0.22.66(q), 14.03(q).
MS (El): 220 (9), 205 (1), 191 (1), 175 (1), 149 (3), 148 (6), 147 (52), 145 (6), 132 (2),
131 (6), 119 (6), 105 (100), 91 (13), 77 (9), 65 (4), 55 (3), 41 (3), 29 (10).
d) Ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate, ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate, and ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate A solution of 35:65 cis-/trans-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.1 g, 0.42 mmol) in toluene (1 ml) was treated with para-toluenesulfonic acid monohydrate (27.5 mg, 0.345 mmol) and molecular sieves, heated at reflux for 2 h, cooled to 0°C, poured into ice, and extracted with MTBE (20 ml). The organic phase
was washed with a saturated aqueous solution of NaCI, dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 10:1) of the crude product (75 mg) gave a 1:1:1 mixture of ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate, ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate, and ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate (40 mg, 43%).
Example 17: (2-methylcyclopropyl)(rel-(6S,7R)-7-methylspiro[4,5]dec-8-en-6-yl)methanone
A solution of trimethylsulfoxonium iodide (3.1 g, 13.7 mmol) in DMSO (30 ml) was added dropwise to a mixture of sodium hydride (0.6 g, 13.7 mmol) in DMSO (10 ml). The resulting mixture was stirred for 45 min., treated with a solution of (E)-1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one (2.5 g, 11.5 mmol) in DMSO (10 ml). After stirring for 2.5 h, the reaction mixture was poured into a cold saturated aqueous solution of NH4CI (100 ml) and extracted twice with hexane (80 ml). The combined organic phases were washed with water (80 ml), dried (MgSO4) and concentrated. FC (180 g SiO2, hexane/MTBE 30:1) of the crude product (2.26 g) gave (2-methylcyclopropyl)(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)methanone (1.04 g, 60:40 diastereomeric mixture, 39%). Boiling point: 105°C (0.08 mbar).
Odour description: woody, Damascone-like.
Data of the main diastereomer:
1 H-NMR (400MHz, CDCI3): selected signals: δ5.58-5.48 (m, H-C(8'), H-C(9')), 2.655 (d,
J = 10.2, H-C(6')), 2.61-2.49 (m, H-C(7')), 1.12 (d, J = 5.9, MeC(3)), 0.89 {d, J = 6.8,
MeC(7')).
13C-NMR (100MHz, CDCI3): δ214.28 (s, CO), 132.93 (d, C(8')), 124.37 (d, C(9')), 62.59
(d, C(6')), 44.94 (s, C(5')), 39.69 (t), 38.11 (t), 33.38 (d, C(7')), 32.27 (d), 30.28 (t),
24.54 (0, 23.84 (t), 20.53 (t), 20.46 (d), 20.02 (q), 18.11 (q).
MS (El): 232 (4), 217 (1), 203 (1), 175 (1), 149 (13), 134 (18), 119 (9), 107 (6), 106 (5),
105 (8), 93 (6), 91 (11), 83 (100), 79 (9), 77 (6), 67 (6), 55 (23), 41 (8), 29 (4).
Data of the minor diastereomer:
1H-NMR (400MHz, CDCI3): selected signals: δ5.58-5.48 (m, H-C(8'), H-C(9')), 2.660 (d,
J = 10.1, H-C(6')), 2.61-2.49 (m, H-C(7')), 1.12 (d, J = 5.9, MeC(3)), 0.91 (d, J = 6.8,
MeC(7')).
13C-NMR (100MHz, CDCI3): δ214.16 (s, CO), 132.91 (d, C(8')), 124.40 (d, C(9')), 62.66 (d, C(6')), 44.71 (s, C(5')), 39.55 (t), 38.32 (0, 33.40 (d, C(7')), 32.43 (d), 30.18 (t), 24.47 (0, 23.70 (t), 21.90 (d), 19.97 (a), 19.17 (0, 18.34 (q).
MS (El): 232 (4), 217 (1), 203 (1), 175 (1), 149 (13), 134 (18), 119 (9), 107 (6), 106 (5), 105 (8), 93 (6), 91 (11), 83 (100), 79 (9), 77 (6), 67 (6), 55 (22), 41 (8), 29 (4).
Example 18: Ethyl 7-methylspiro[4,5]dec-7-ene-6-carboxylate At-20°C, a solution of ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (1.5 g, 6.3 mmol, cis/trans 34:66, prepared as described in example 16) in dichloromethane was treated with successively with triethylsilane (3.66 g, 31.5 mmol) and with BF3OEt2 (1.34 g, 9.4 mmol). The resulting solution was stirred for 45 min., poured into an ice-cold 2M aqueous NaOH solution (50 ml), and extracted twice with MTBE (40 ml). The organic phases were washed with water (40 ml), with a saturated aqueous solution of NaCI (40 ml), dried (MgSO4) and concentrated. FC (100 g SiO2, hexane/MTBE 25:1) of the crude product (1.28 g) gave ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.98 g, 70%).
Example 19: rel-(6S,7S)-Ethyl 7-methylspiro[4,5]dec-9-ene-6-carboxylate
a) cis-Ethyl 7-methyl-9-oxospiro[4.5]decane-6-carboxylate
A solution of ethyl 7-methyl-9-oxospiro[4.5]dec-7-ene-6-carboxylate (2.5 g, 10.6 mmol,
prepared as described in Example 16) in hexane (40 ml) was treated with 10% Pd/C
(0.5 g) and hydrogenated (10 bar) for 1.5 h. The resulting mixture was filtered and
concentrated to give c/s-ethyl 7-methyl-9-oxospiro[4.5]decane-6-carboxylate (2.29,
91%).
1H-NMR (400MHz, CDCI3): δ4.20 (t), J = 7.1, CH2O), 2.93 (br. d, J = 13.9, H-C(10')),
2.72 (t, J = 13.1, H-C(8')), 2.43 (br. d, J = 4.2, H-C(6')), 2.29-2.14 (m, 2 H), 2.08 (td, J =
1.5, 13.8, H-C(10')), 1.77-1.56 (m, 5 H), 1.56-1.47 (m, 1 H), 1.45-1.36 (m, 1 H), 1.35-
1.25 (m, 1 H), 1.30 (t, J = 7.1, MeCH2O), 1.02 (d, J = 6.6, MeC(7')).
13C-NMR (100MHz, CDCI3): δ211.48 (s, C(9')O), 173.35 (s, CO2), 60.03 (t, OCH2),
54.95 (d, C(6')), 48.26 (s, C(5')), 47.68 (t), 45.06 (t), 38.48 (0, 37.62 (t), 32.35 (d, C(7')),
23.86 (0, 23.59 (t), 19.48 (qr), 14.40 (q).
MS (El): 239 (10), 238 (63), 223 (4), 209 (77), 196 (19), 193 (16), 192 (11), 165 (100),
164 (80), 156 (17), 155 (31), 154 (37), 149 (31), 147 (33), 135 (40), 128 (71), 126 (33),
124 (37), 123 (63), 122 (40), 109 (86), 95 (55), 93 (35), 91 (25), 82 (21), 81 (69), 73 (2), 69 (92), 67 (71), 55 (76), 53 (37), 41 (74), 39 (32), 29 (48).
IR: vmax 2957, 2873, 1711, 1455, 1417, 1378, 1346, 1301, 1279, 1231, 1162, 1146, 1095, 1027, 954, 914, 882 cm-1.
b) rel-(6S,7S,9S)- and rel-(6S,7S,9R)-Ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate
At 5°C, NaBH4 (0.26 g, 6.5 mmol) in methanol (25 ml) was treated with a solution of crude c/'s-ethyl 7-methyl-9-oxospiro[4.5]decane-6-carboxylate (2.2 g, 9.2 mmol) in methanol (10 ml). The resulting mixture was stirred at 20°C for 4 h, poured into 2N aqueous HCI (30 ml) and ice/water (50 ml), and extracted twice with MTBE (50 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4) and concentrated. FC (180 g SiO2, hexane/MTBE 2:1) of the crude product (2.07 g, cis,cis/cis,trans 39:61) gave rel-(6S,7S,9S)-ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate (cis.trans; 0.82 g, 37%) and rel-(6S,7S,9R)-ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate (cis,cis; 0.49 g, 22%).
rel-(6S,7S,9S)-Ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate
1H-NMR (400MHz, CDCI3): δ4.19 (quint, J = 3.2, H-C(9')), 4.11 (qr, J = 7.1, CH2O), 2.37
(br. d, J = 4.6, H-C(6')), 2.33-2.21 (m, 1 H), 2.13 (t, J = 3.4, 14.4, H-C(10')), 1.93 {ddd, J
= 3.3, 12.6, 14.0, H-C(8")), 1.85-1.35 (m, 10 H), 1.32-1.24 (m, 1 H), 1.26 (t, J = 7.1,
MeCH2O), 0.92 (d, J = 7.0, MeC(7')).
13C-NMR (100MHz, CDCI3): δ173.97 (s, CO), 67.72 (d, C(9')), 59.38 (t, OCH2), 53.98
(d, C(6')), 43.82 (s, C(5')), 39.71 (t), 39.20 (t), 39.03 (0, 36.17 (t), 25.13 (d, C(7')), 24.15
(0,22.71(0, 19.76 (qf), 14.42 (q).
MS (El): 240 (1), 238 (1), 222 (7), 209 (1), 195 (4), 193 (3), 183 (3), 176 (21), 167 (4),
165 (6), 155 (16), 149 (88), 148 (100), 134 (36), 127 (8), 121 (11), 119 (13), 115 (21),
109 (33), 108 (61), 93 (54), 81 (35), 79 (34), 69 (23), 67 (39), 55 (32), 45 (4), 41 (34),
29 (22).
rel-(6S,7S,9R)-Ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate 1H-NMR (400MHz, CDCI3): δ4.12 (t), J = 7.1, CH2O), 3.69 (tt, J = 4.7, 11.4, H-C(9')), 2.22 (br. d, J = 4.8, H-C(6')), 1.88 (t, J = 12.0, H-C(10')), 1.94-1.82 (m, 1 H), 1.79-1.30 (m, 12 H), 1.26 (t, J = 7.1, MeCH2O), 0.95 (d, J = 7.0, MeC(7')).
13C-NMR (100MHz, CDCl3): (5173.66 (s, CO), 68.34 (d, C(9')), 59.53 (t, OCH2), 54.37 (d, C(6')), 45.90 (s, C(5')), 41.45 (t), 39.26 (0, 38.57 (t), 37.30 (0, 30.25 (d, C(7')), 24.31 (0.23.43(0, 19.55(q). 14.42 ((t).
MS (El): 240 (1), 238 (1), 222 (4), 209 (1), 195 (3), 193 (1), 183 (1), 176 (26), 167 (1), 165 (3), 155 (10), 149 (93), 148 (100), 134 (14), 127 (6), 121 (16), 119 (14), 115 (16), 109 (39), 108 (31), 93 (54), 81 (39), 79 (38), 69 (22), 67 (48), 55 (34), 45 (7), 41 (38), 29 (22).
c) rel-(6S,7S)-Ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate
A 64:36 mixture of rel-(6S,7S,9S)- and (6S,7S,9R)-ethyl 9-hydroxy-7-methylspiro[4.5]decane-6-carboxylate (2.4g, 9.99 mmol) in pyridine (25 ml) was cooled to -10°C and treated with POCI3 (1 ml, 11 mmol). The resulting mixture was stirred for 16 h while allowing the reaction temperature to slowly reach 25°C, poured into cold 2N aqueous HCI (100 ml), and extracted twice with hexane (70 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (200 g SiO2, hexane/MTBE 80:1) of the crude product (1.6 g) gave rel-(6S,7S)-ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (0.51 g, 23%). Boiling point: 90oC (0.08 mbar).
Odour description: agrestic, Damascone-like, fruity, slightly aromatic.
13C-NMR (100MHz, CDCl3): δ 173.17 (s, CO), 133.39 (d), 124.48 (d), 59.42 (0, 54.09 (d), 46.45 (s), 41.68 (0, 37.40 (0, 30.40 (0, 28.45 (d), 24.05 (0, 23.60 (0, 19.99 (q), 14.42 (q).
MS (El): 222 (10), 207 (1), 193 (1), 179 (2), 177 (8), 176 (19), 149 (100), 148 (97), 141 (3), 134 (7), 133 (28), 128 (4), 119 (23), 115 (7), 113 (2), 107 (31), 106 (48), 105 (48), 93 (53), 91 (65), 81 (29), 79 (36), 77 (26), 67 (23), 55 (17), 45 (2), 41 (26).
d) rel-(6S,7S)- and rel-(6R,7S)-Ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate
A mixture of rel-(6S,7S)-ethyl 7-methyispiro[4.5]dec-9-ene-6-carboxylate and rel-
(6S,7S)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (0.1 g, 0.45 mmol) in 1-methyl-
2-pyrrolidone (1 ml) was treated with KOt-Bu (56 mg, 0.5 mmol). The resulting mixture
was stirred at 60°C for 2 h, treated with KOt-Bu (56 mg, 0.5 mmol), stirred for 1 h,
poured into cold 2N aqueous HCI (10 ml), and extracted twice with hexane (20 ml). The
combined organic phases were washed with 2N aqueous HCI (10 ml), with water (10
ml), with a saturated aqueous solution of NaCI (10 ml), dried (MgSO4), concentrated, and gave a 38:39:9:14 mixture of rel-(6S,7S)-/ rel-(6R,7S)-ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate / rel-(6R,7S)- / rel-(6S,7S)-ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate (64 mg, 64%).
rel-(6R,7S)-Ethyl7-methylspiro[4.5]dec-9-ene-6-carboxylate
MS (El): 222 (10), 207 (1), 193 (1), 179 (2), 177 (9), 176 (9), 149 (100), 148 (97), 141 (5), 134 (8), 133 (19), 128 (6), 119 (17), 115 (11), 113 (2), 107 (31), 106 (32), 105 (38), 93 (55), 91 (53), 81 (30), 79 (35), 77 (23), 67 (20), 55 (15), 45 (2), 41 (25).
Example 20: rel-(6S.7S)-methyl 7-methylspiro[4,5]dec-9-ene-6-carboxylate
a) 7-Methylspiro[4.5]dec-9-ene-6-carboxylic acid
A solution of KOH (19.1 g, 289 mmol) in ethanol (60 ml) was treated with rel-(6S,7S)-ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (4.28 g, 19.2 mmol, prepared as described in Example 19) and after refluxing for 3 d, the resulting mixture was poured into cold 2N aqueous NaOH (100 ml), and extracted twice with cyclohexane (50 ml). The combined aqueous phases were acidified with cone. HCI, extracted twice with MTBE (50 ml), and the combined org. phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (300 g SiO2, hexane/MTBE 8:1) of the crude product (2.65 g) gave 7-methylspiro[4.5]dec-9-ene-6-carboxylic acid (1.4 g, 37%).
13C-NMR (100MHz, CDCI3): δ179.29 (s, CO), 133.36 (d), 124.53 (d), 54.20 (d), 46.45 (s), 41.76 (t), 37.49 (0, 30.21 (t), 28.30 (d), 24.12 (t), 23.62 (t), 19.99 (q).
b) Methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate
At 5oC, a solution of 7-methylspiro[4.5]dec-9-ene-6-carboxylic acid (1.4 g, 7.2 mmol) in DMF was treated with K2CO3 (1.1 g, 7.9 mmol). The resulting mixture was stirred for 30 min., treated with methyl iodide (0.67 ml, 10.8 mmol), stirred at 20°C for 2 h, poured into cold 2N aqueous HCI (20 ml), and extracted twice with hexane (70 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (170 g SiO2, pentane/diethyl ether 80:1) of the crude product (1.4 g) gave rel-(6R,7S)-methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (0.15 g, 10%) and rel-(6S,7S)-methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (0.53 g, 35%).
rel-(6S,7S)-Methyl7-methylspiro[4.5]dec-9-ene-6-carboxylate Boiling point: 85°C (0.09 mbar).
13C-NMR (100MHz, CDCI3): δ173.68 (s, CO), 133.34 (d), 124.50 (d), 54.11 (d), 50.60 (q), 46.41 (s), 41.68 (0, 37.48 (t), 30.34 (t), 28.42 (d), 24.07 (t), 23.62 (t), 20.06 (q). MS (El): 208 (9), 193 (1), 177 (5), 176 (18), 149 (100), 148 (95), 141 (6), 134 (8), 133 (29), 127 (5), 119 (25), 114 (6), 107 (38), 106 (46), 105 (49), 93 (54), 91 (67), 82 (3), 81 (26), 79 (37), 77 (27), 67 (24), 55 (17), 41 (27).
Odour description: agrestic, green, Damascone-like, minty.
rel-(6R,7S)-Methyl7-methylspiro[4.5]dec-9-ene-6-carboxylate 13C-NMR (100MHz, CDCI3): δ174.97 (s, CO), 137.18 (d), 121.46 (d), 56.34 (d), 50.98 (q), 46.11 (s), 38.72 (t), 35.06 (t), 33.67 (t), 29.08 (d), 25.72 (t), 24.86 (t), 19.94 (q). MS (El): 208 (9), 177 (5), 176 (10), 149 (100), 148 (91), 134 (9), 133 (20), 127 (9), 119 (19), 114 (9), 108 (18), 107 (40), 106 (32), 105 (39), 93 (59), 91 (58), 81 (27), 79 (37), 77 (25), 67 (22), 59 (13), 55 (16), 41 (28).
Example 21: (E)-1-(rel-(6S.7S)-7-methylspiro[4,5]dec-9-en-6-yl)but-2-en-1-one At 5°C, a solution of allylmagnesium chloride (12.1 ml, 2 M in THF) was treated dropwise with a solution of Ae/-(6S,7S)-ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate (1.5 g, 6.7 mmol, prepared as described in Example 19) in THF (20 ml), stirred at 20°C for 1 h, poured into cold 2N aqueous HCI (30 ml), and extracted twice with MTBE (70 ml). The combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (100 ml), dried (MgSO4), and concentrated. The crude product (1.9 g) was dissolved in DMF (10 ml) and added to a solution of KOt-Bu (1.2 g, 10.7 mmol) in DMF (10 ml). The resulting mixture was stirred for 1 h, poured into cold 2N aqueous HCI (30 ml), and extracted twice with hexane (80 ml). The combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (100 ml), dried (MgSO4), and concentrated. The crude product (1.9 g) was then dissolved in toluene (15 ml) and treated with PTSA.H2O (15 mg, 0.077 mmol). The resulting solution was stirred at 60°C for 2.75 h, poured into cold water (30 ml), and extracted with cyclohexane (20 ml). The combined organic phases were washed with a saturated aqueous solution of NaCI (20 ml), dried (MgSO4), and concentrated. FC (120 g SiO2, hexane/MTBE 25:1) of the crude product (1.38 g) gave (E)-1-(rel-(6S,7S)-7-
methylspiro[4.5]dec-9-en-6-yl)but-2-en-1-one (0.63 g, 43%). Boiling point: 115°C (0.09 mbar).
Odour description: Damascone-like, aromatic.
13C-NMR (100MHz, CDCI3): δ202.47 (s, CO), 141.23 (d), 134.57 (d), 133.91 (d), 124.48 (d), 58.19 (d), 46.62 (s), 42.42 (t), 36.94 (t), 30.65 (t), 29.29 (d), 24.30 (t), 23.58 (0,
20.18 (δ7), 18.15(q).
MS (El): 218 (6), 203 (3), 189 (3), 175 (4), 163 (6), 149 (37), 134 (7), 123 (11), 111 (19), 109 (19), 93 (24), 91 (28), 81 (28), 79 (21), 77 (15), 69 (100), 55 (13), 41 (45).
Example 22: Ethyl 7-methylspiro[4,5]deca-6.8-diene-6-carboxylate
a) cis- and trans-Ethyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate
A mixture of 35:65 cis-/trans-ethyl 9-hydroxy-7-methy!spiro[4.5]dec-7-ene-6-carboxylate
(0.1 g, 0.42 mmol, prepared as described in Example 16), acetic anhydride (90 mg,
0.88 mmol), and sodium acetate (34.4 mg, 0.42 mmol) was heated at 80°C for 2 h,
cooled to 20°C, poured into ice, and extracted with MTBE (20 ml). The organic phase
was washed with a saturated aqueous solution of NaCI, dried (MgSO4) and
concentrated. FC (SiO2, hexane/MTBE 10:1) of the crude product (170 mg) gave a
35:65 mixture of cis-/trans-ethyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate
(50 mg, 43%).
cis-Ethyl 9-acetoxy-7-methylspiro[4,5]dec-7-ene-6-carboxylate 1H-NMR (400MHz, CDCI3): δ5.66 {dquint, J = 1.3, 3.0, H-C(8')), 5.33-5.30 (m, H-C(9)), 4.24-4.10 {m, CH2O), 2.79 (br. s, H-C(6')), 2.34 {dd, J = 5.8,14.9, H-C(10')), 2.09 (s, MeCO), 1.74 (td, J = 0.4, 1.4, MeC(7')), 1.79-1.31 (m, 9 H), 1.26 ( t, J = 7.2, MeCH2O). 13C-NMR (100MHz, CDCI3): δ172.35 (s, CO), 170.70 (s, CO), 136.50 (s, C(7')), 122.22 (d, C(8')), 68.12 (d, C(9')), 60.46 (t, OCH2), 55.30 (d, C(6')), 42.92 (s, C(5')), 37.98 (0,
37.19 (t), 34.75 (t), 23.74 (t), 23.30 (t), 23.02 (q), 21.30 (q), 14.21 (q).
MS (El): 280 (1), 238 (1), 220 (5), 209 (4), 206 (12), 193 (1), 175 (3), 165 (12), 164 (58), 147 (65), 131 (10), 122 (18), 105 (100), 91 (26), 79 (14), 77 (15), 67 (8), 60 (4), 55 (7), 43(20), 29(14).
trans-Ethyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate
1H-NMR (400MHz, CDCI3): δ5.59-5.57 (m, H-C(8')), 5.37-5.32 (m, H-C(9')). 4.24-4.10 (m, CH2O), 2.67 (br. s, H-C(6')), 2.14 (dd, J = 10.1, 12.5, H-C(10')), 2.06 (s, MeCO), 1.70 (tm, J = 0.4,1.6, MeC(7')), 1.79-1.31 (m, 9 H), 1.28 (t, J = 7.2, MeCH2O). "C-NMR (100MHz, CDCI3): δ172.74 (s, CO), 171.07 (s, CO), 134.87 (s, C(7')), 124.14 (d, C(8')), 69.50 (d, C(9')), 60.51 (t, OCH2), 55.28 (d, C(6')), 45.26 (s, C(5')), 37.86 (t), 37.09 (t), 34.03 (t), 23.68 (t), 23.35 (0, 22.62 (q), 21.28 (q), 14.24 (q). MS (El): 280 (1), 238 (2), 220 (5), 209 (5), 206 (18), 193 (6), 165 (16), 164 (82), 147 (63), 131 (10), 122 (21), 105 (100), 91 (26), 79 (15), 77 (14), 67 (8), 60 (3), 55 (8), 43 (26), 29 (14).
b) Ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate
A solution of a 30:70 mixture of cis-/trans-ethyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (2.7 g, 9.6 mmol) in DBU (15 ml, 97 mmol) was stirred for 4 d at 20°C. The reaction mixture was poured into cold 2N aqueous HCI (50 ml), and extracted twice with MTBE (50 ml). The combined organic phases were washed with 2N aqueous HCI (30 ml), with water (40 ml), with a saturated aqueous solution of NaCI (40 ml), dried (MgSO4), and concentrated. FC (250 g SiO2, pentane/Et2O 100:1) of the crude product (1.8 g) gave methyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate (0.54 g, 25%). Boiling point: 96°C (0.08 mbar).
Odour description: ethyl safranate-like, fruity, floral, agrestic, herbaceous.
Example 23: Methyl 7-methylspiro[4,5]deca-6,8-diene-6-carboxylate A 33:67 cis-/trans-ethyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (38 g, 0.16 mol, prepared as described in Example 16) was added to a solution of KOH (52.6 g, 0.8 mol) in ethanol (300 ml). The resulting mixture was stirred for 2 h at reflux, poured into cold 2N aqueous NaOH (100 ml), and extracted twice with MTBE (100 ml). The combined organic phases were washed with 2N aqueous NaOH (50 ml), the combined aqueous phases were acidified with cone. HCI, extracted twice with MTBE (150 ml), and the combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (100 ml), dried (MgSO4), and concentrated, giving crude trans-9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylic acid (22.7 g).
13C-NMR (100MHz, CDCI3): δ177.37 (s, CO), 132.55 (s), 128.65 (d), 66.40 (d), 55.20 (d), 45.52 (s, C(5')), 38.04 (0, 38.02 (t), 37.09 (0, 23.62 (t), 23.32 (t), 22.68 (q).
MS (El): 210 (1), 192 (2), 181 (8), 165 (2), 148 (28), 147 (7), 133 (9), 119 (16), 106 (76), 105 (100), 91 (72), 79 (19), 77 (21), 65 (11), 44 (20).
At 5°C, a solution of the crude trans-9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylic acid obtained (22.7 g) in DMF (150 ml) was treated with potassium carbonate (16.3 g, 118 mmol) and stirred for 30 min. The resulting mixture was then treated within 6 min. with methyl iodide (13.4 ml, 215 mmol), stirred for 2 h at 20°C, poured into cold 2N aqueous HCI (200 ml), and extracted twice with hexane (150 ml). The combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (150 ml), dried (MgSO4), and concentrated, giving crude trans-methyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (12.85 g, 36%).
13C-NMR (100MHz, CDCI3): δ173.82 (s, CO), 132.43 (s), 128.88 (d), 66.32 (d), 55.34 (d), 51.61 (t), OMe), 45.63 (s, C(5')), 38.58 (t), 38.00 (t), 37.08 (t), 23.63 (t), 23.32 (t), 22.63 (q ).
A part of the crude trans-methyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate obtained (4.0 g) was treated with acetic anhydride (3.5 ml, 37.4 mmol) and sodium acetate (1.46 g, 17.8 mmol). The resulting mixture was stirred at 80°C for 4 h, poured into cold 2N aqueous NaOH (20 ml), and extracted twice with MTBE (30 ml). The combined organic phases were washed with water (30 ml), with a saturated aqueous solution of NaCI (30 ml), dried (MgSO4), concentrated giving crude trans-methyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (4.4 g, 92%).
13C-NMR (100MHz, CDCI3): δ173.20 (s), 170.97 (s), 134.76 (s), 124.27 (d), 69.43 (d), 55.27 (d), 51.66 (t), OMe), 45.22 (s, C(5')), 37.95 (t), 37.08 (t), 34.05 (0, 23.71 (0, 23.37 (0. 22.70 (q), 21.32(q).
A part of the crude trans-methyl 9-acetoxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate obtained (2.4 g) was dissolved in DBU (13 g, 85.6 mmol) and stirred for 21 h at 20°C and for 7 h at 40°C. The reaction mixture was poured into cold 2N aqueous HCI (60 ml), and extracted twice with cyclohexane (50 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (500 g SiO2, pentane/Et2O 100:1) of the crude product
(1.47 g) gave methyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate (0.77 g, 13% estimated overall yield). Boiling point: 100°C (0.08 mbar).
Odour description: floral, fruity, green, mossy, balsamic.
13C-NMR (100MHz, CDCI3): δ170.52 (s, CO), 132.90 (s), 132.54 (s), 128.68 (d), 128.50 (d), 50.93 (t, OMe), 44.39 (s, C(5')), 36.61 (t), 35.81 (t, 2 C), 24.17 (t, 2 C), 19.73 (q). MS (El): 206 (15), 175 (34), 163 (19), 147 (40), 146 (27), 145 (75), 133 (10), 132 (20), 131 (14), 119 (18), 105 (100), 91 (37), 77 (23), 65 (12), 59 (10), 41 (12), 39 (11).
Example 24: Methyl 7-methylenespiro[4,5]dec-8-ene-6-carboxylate A solution of crude trans-methyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (4.0 g, 17.8 mmol, prepared as described in the Example 23) in THF (40 ml) was treated with water (0.32 ml, 17.8 mmol) and cone, sulphuric acid (0.29 ml, 5.3 ml). The resulting mixture was stirred for 8 h at 60°C, poured into cold 2N aqueous NaOH (30 ml), and extracted twice with cyclohexane (60 ml). The combined organic phases were washed with water (60 ml), with a saturated aqueous solution of NaCI (60 ml), dried (MgSO4), and concentrated. FC (500 g SiO2, pentane/Et2O 80:1) of the crude product (2.9 g) gave a 84:16 mixture of methyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate / methyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate (1.15 g, 31%, 27% estimated four-step overall yield). Boiling point: 95°C (0.07 mbar).
Odour description: agrestic, spicy, fruity, floral, woody.
Data of methyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate
13C-NMR (100MHz, CDCI3): δ173.15 (s, CO), 140.33 (s), 129.89 (d), 127.35 (d), 114.94 (0, 55.59 (d, C(6')), 51.43 (t), OMe), 43.68 (s, C(5')), 38.35 (0, 37.61 (t), 35.11 (t), 24.44 (0.24.14(0,19.73(q).
MS (El): 206 (5), 175 (2), 163 (3), 147 (73), 131 (15), 119 (8), 118 (10), 117 (10), 105 (100), 91 (27), 79 (17), 77 (17), 65 (9), 59 (8), 41 (11), 39 (9).
Example 25: Methyl 7-methylspiro[4,5]dec-7-ene-6-carboxylate At -30°C, a solution of crude trans -methyl 9-hydroxy-7-methylspiro[4.5]dec-7-ene-6-carboxylate (1.1 g, 4.9 mmol, prepared as described In the Example 23) in dichloromethane (10 ml) was treated with triethylsilane (4.0 ml, 24.5 mmol) and with
BF3.OEt2 (0.92 ml, 7.4 mmol). The resulting mixture was stirred for 45 min. while allowing the temperature to reach 0°C, poured into cold 2N aqueous NaOH (50 ml), and extracted twice with MTBE (25 ml). The combined organic phases were washed with water (25 ml), with a saturated aqueous solution of NaCI (25 ml), dried (MgSO4), and concentrated. FC (55 g SiO2, hexane/MTBE 40:1) of the crude product (1 g) gave methyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (0.92 g, 90%). Boiling point: 98°C (0.07 mbar).
Odour description: fruity, woody, agrestic.
13C-NMR (100MHz, CDCI3): δ174.48 (s, CO), 130.01 (s), 124.59 (d), 55.76 (d, C(6')), 51.38 (t), OMe), 43.76 (s, C(5)), 37.76 (t), 36.61 (t), 28.23 (t), 24.01 (t), 23.92 (t), 23.12 (t), 23.09 (q) .
MS (El): 208 (22), 193 (2), 176 (10), 149 (86), 148 (100), 134 (16), 127 (34), 125 (23), 119 (14), 114 (21), 107 (31), 106 (40), 105 (37), 95 (36), 93 (33), 91 (50), 81 (43), 79 (36), 77 (25), 67 (36), 59 (9), 55 (15), 53 (14), 41 (25), 39 (14).
Example 26: Methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate
a) Methyl 1-methyl-7-oxaspiro[bicyclo[4.1.0]heptane-3,1'-cyclopentane]-2-carboxylate
At 5°C, a solution of methyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (13.5 g, 60
mmol, prepared as described in Example 25) in dichloromethane (150 ml) was treated
with MCPBA (17.8 g, 72 mmol). The resulting mixture was stirred for 4 h at 20°C,
filtered, and the organic phase was washed with water (100 ml), dried (MgSO4),
concentrated, and gave crude methyl 1-methyl-7-oxaspiro[bicyclo[4.1.0]heptane-3,1'-
cyclopentane]-2-carboxylate (13 g). Boiling point: 130°C (0.08 mbar).
13C-NMR (100MHz, CDCI3): δ171.48 (s, CO), 59.56 (d), 57.59 (s), 53.45 (d), 51.23 (qr), 41.94 (s), 37.17 (t), 36.18 (t), 25.92 (t), 24.62 (q), 24.49 (t), 23.97 (t), 22.07 (t). MS (El): 224 (1), 209 (1), 206 (1), 168 (15), 165 (13), 147 (19), 125 (46), 114 (37), 105 (23), 93 (45), 79 (58), 67 (66), 59 (89), 58 (100), 43 (91), 41 (54).
b) The crude methyl 1-methyl-7-oxaspiro[bicyclo[4.1.0]heptane-3,1'-cyclopentane]-2-
carboxylate obtained (13 g) was added to a solution of sodium (1.5 g, 64 mmol) in
methanol (100 ml) and the resulting mixture was refluxed for 10 h, poured into cold 2N
aqueous HCI (100 ml), and extracted twice with MTBE (100 ml). The combined organic
phases were washed with water (100 ml), twice with a saturated aqueous solution of NaCI (100 ml), dried (MgSO4), concentrated, and gave crude gave methyl 8-hydroxy-7-methylspiro[4.5]dec-6-ene-6-carboxylate (5.65 g) which was dissolved in dichloromethane (80 ml) and treated at -30°C with triethylsilane (14.4 ml, 0.1 mol) and with BF3.OEt2 (4.7 ml, 37.8 mmol). The resulting mixture was stirred for 3 h while allowing the temperature to reach 20°C, poured into cold 2N aqueous NaOH (80 ml), and extracted twice with MTBE (100 ml). The combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (100 ml), dried (MgSO4), and concentrated. FC (90 g SiO2, hexane/MTBE 95:5) of the crude product (2.05 g) gave methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate (1.16 g, 42% three-step overall yield). Boiling point: 105°C (0.08 mbar).
Odour description: fruity, damascone-like, leather, woody.
13C-NMR (100MHz, CDCl3): δ171.41 (s), 134.65 (s), 134.34 (s), 51.06 (t), OMe), 44.33 (s, C(5')), 38.10 (t, 2 C), 35.57 (t), 31.04 (t), 24.83 (t, 2 C), 21.54 (q), 31.04 (t). MS (El): 208 (6), 193 (1), 179 (9), 177 (10), 166 (29), 149 (100), 134 (24), 119 (12), 107 (23), 105 (19), 93 (19), 91 (30), 81 (8), 79 (17), 77 (15), 67 (8), 59 (7), 55 (9), 41 (12).
Example 27: Ethyl 7-methylspiro[4,5]dec-6-ene-6-carboxylate Prepared from ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (prepared as described in Example 14), as described for the preparation of methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate from methyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate (Example 26), via crude ethyl 1-methyl-7-oxaspiro[bicyclo[4.1.0]heptane-3,1'-cyclopentane]-2-carboxylate (MCPBA, CH2CI2), transformed into crude ethyl 8-hydroxy-7-methylspiro[4.5]dec-6-ene-6-carboxylate (NaOEt, reflux, 4 h) that was reduced using triethylsilane and BF3.OEt2 in dichloromethane (64% overall yield after FC (400 g SiO2, hexane/MTBE 40:1)).
Ethyl 1 -methyl-7-oxaspiro[bicyclo[4.1.0]heptane-3,1 '-cyclopentane]-2-carboxylate
Boiling point: 135oC (0.07 mbar).
13C-NMR (100MHz, CDCI3): δ170.94 (s, CO), 60.00 (t, OCH2), 59.55 (d, C(8')), 57.65
(s, C(7')), 53.44 (d, C(6')), 41.91 (s, C(5')), 37.17 (t), 37.01 (t), 25.94 (t), 24.66 (q), 24.51
(t),23.99(t),22.10(t), 14.33 (q).
MS (El): 238 (1), 223 (2), 222 (2), 220 (2), 210 (3), 209 (5), 193 (17), 182 (24), 165 (20),
155 (13), 147 (39), 143 (31), 135 (18), 128 (26), 125 (40), 122 (24), 111 (47), 105 (38),
97 (44), 93 (56), 91 (45), 85 (41), 83 (44), 81 (53), 79 (75), 77 (37), 73 (52), 72 (84), 67 (69), 55 (46), 45 (12), 43 (100), 41 (59), 29 (45).
Ethyl 8-hydroxy-7-methylspiro[4.5]dec-6-ene-6-carboxylate
13C-NMR (100MHz, CDCI3): δ170.61 (s, CO), 137.62 (s, C(7')), 134.08 (s, C(6')), 68.49
(d, C(8')), 60.38 (t, OCH2), 44.72 (s, C(5')), 37.90 (t), 36.62 (t), 31.68 (t), 29.10 (t), 24.78
(t),24.65(t), 17.78 (q), 14.18(q).
MS (El): 238 (13), 223 (18), 220 (3), 209 (6), 193 (47), 192 (49), 181 (7), 177 (18), 165
(100), 163 (62), 156 (45), 149 (34), 147 (51), 135 (37), 122 (38), 121 (42), 110 (50), 107
(34), 105 (59), 93 (35), 91 (59), 82 (14), 81 (25), 79 (51), 77 (43), 67 (30), 55 (33), 43
(49), 29 (31).
Ethyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate (Boiling point: 100°C (0.08 mbar)). 13C-NMR (100MHz, CDCI3): δ170.94 (s), 134.48 (s), 134.21 (s), 60.02 (t, OCH2), 44.37 (s, C(5')), 38.05 (t, 2 C), 35.65 (t), 31.05 (t), 24.88 (t, 2 C), 21.39 (q), 19.50 (t), 14.30
(q)..
MS (El): 208 (1), 193 (3), 180 (14), 179 (2), 177 (14), 166 (1), 149 (100), 134 (9), 119 (7), 107 (16), 105 (12), 93 (20), 91 (21), 81 (8), 79 (14), 77 (11), 67 (8), 59 (1), 55 (7), 41 (9).
Odour description: fruity, floral, agrestic, ethyl safranate-like
Example 28: Ethyl 7-methylenespiro[4,5]decane-6-carboxylate a) 7-methylenespiro[4.5]decane-6-carboxylic acid
A solution of KOH (47.5 g, 0.72 mol) in EtOH (200 ml) was treated with methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate (15 g, 0.072 mol, prepared as described in Example 26) and the resulting mixture was stirred at reflux for 6 h, poured into cold 2N aqueous NaOH (300 ml), and extracted twice with cyclohexane (100 ml). The combined organic phases were washed with 2N aqueous NaOH (100 ml), and the combined aqueous phases were acidified with cone. HCI, and extracted twice with MTBE (150 ml). The combined organic phases were washed with water (100 ml), with a saturated aqueous solution of NaCI (150 ml), dried (MgSO4), and concentrated. FC (90 g SiO2, hexane/MTBE 88:12) of the crude product (12.8 g) gave 7-methylenespiro[4.5Jdecane-6-carboxylic acid (0.7 g, 5%) and 7-methylspiro[4.5]dec-7-ene-6-carboxylic acid (0.57 g, 4%).

7-methylenespiro[4.5]decane-6-carboxylicacid
13C-NMR (100MHz, CDCI3): δ178.99 (s), 144.81 (s), 112.37 (t), 58.60 (d), 46.29 (s,
C(5')), 38.16 (0. 36.65 (t), 32.83 (t), 31.31 (t), 24.32 (t), 24.13 (t), 23.76 (t).
MS (El): 194 (25), 179 (3), 176 (5), 149 (100), 148 (40), 134 (19), 119 (10), 113 (36),
111 (27), 107 (32), 106 (20), 105 (31), 95 (60), 93 (40), 91 (52), 82 (28), 81 (46), 79
(44), 77 (31), 67 (78), 55 (24), 53 (22), 45 (6), 41 (40), 39 (23).
7-Methylspiro[4.5]dec-7-ene-6-carboxylicacid
13C-NMR (100MHz, CDCI3): δ179.75 (s), 129.73 (s), 125.02 (d), 55.50 (d), 43.64 (s,
C(5')), 37.84 (t), 36.63 (t), 27.95 (t), 24.00 (t), 23.89 (t), 23.14 (d), 23.10 (t).
MS (El): 194 (9), 179 (3), 176 (4), 149 (45), 148 (22), 134 (31), 125 (9), 119 (7), 113
(13), 111 (12), 107 (17), 105 (13), 95 (100), 94 (28), 93 (26), 91 (33), 82 (15), 81 (21),
79 (41), 77 (23), 67 (49), 55 (20), 53 (19), 45 (4), 41 (34), 39 (20).
b) Ethyl 7-methylenespiro[4.5]decane-6-carboxylate
At 5°C, a solution of the previously obtained 7-methylenespiro[4.5]decane-6- carboxylic acid (1.2 g, 6.2 mmol) in DMF (30 ml) was treated with K2CO3 (0.94 g, 6.8 mmol). The resulting mixture was stirred for 30 min., treated with ethyl iodide (0.75 ml, 9.3 mmol), stirred at 20°C for 2 h, poured into cold 2N aqueous HCI (20 ml), and extracted twice with hexane (50 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (90 g SiO2, hexane/MTBE 98:2) of the crude product (1.23 g) gave ethyl 7-methylenespiro[4.5]decane-6-carboxylate (0.69 g, 50%). Boiling point: 90°C (0.08 mbar).
Odour description: fruity, orris, damascone, floral, green, agrestic.
13C-NMR (100MHz, CDCI3): δ172.74 (s), 145.42 (s), 111.44 (t), 59.94 (t), 58.76 (d), 46.51 (s, C(5')), 37.85 (t), 36.69 (t), 33.21 (t), 31.57 (t), 24.37 (t), 24.22 (t), 23.90 (t), 14.24 (q).
MS (El): 222 (13), 207 (2), 193 (3), 180 (4), 176 (9), 149 (87), 148 (100), 141 (15), 134 (32), 128 (40), 119 (13), 113 (15), 107 (27), 106 (28), 105 (25), 95 (45), 94 (22), 93 (33), 91 (48), 81 (41), 79 (53), 77 (26), 67 (47), 55 (22), 53 (19), 41 (32), 29 (20).
Example 29: Methyl 7-methylenespiro[4,5]decane-6-carboxylate At 5°C, a solution of the previously obtained 7-methylenespiro[4.5]decane-6-carboxylic acid (1.1 g, 5.66 mmol, prepared as described in Example 28) in DMF (20 ml) was treated with K2CO3 (0.86 g, 6.8 mmol). The resulting mixture was stirred for 30 min., treated with methyl iodide (0.53 ml, 8.5 mmol), stirred at 20°C for 2 h, poured into cold 2N aqueous HCI (30 ml), and extracted twice with hexane (50 ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (50 ml), dried (MgSO4), and concentrated. FC (30 g SiO2, hexane/MTBE 50:1) of the crude product (1 g) gave methyl 7-methylenespiro[4.5]decane-6-carboxylate (0.84 g, 71%). Boiling point: 90°C (1.1 mbar).
Odour description: fruity, agrestic, spicy.
13C-NMR (100MHz, CDCI3): δ173.17 (s), 145.33 (s), 111.55 (t), 58.64 (d), 51.21 (q), 46.51 (s, C(5')), 37.95 (t), 36.65 (t), 33.16 (t), 31.53 (t), 24.38 (t), 24.23 (t), 23.90 (t). MS (El): 208 (13), 176 (13), 149 (80), 148 (100), 134 (41), 127 (27), 125 (19), 119 (15), 114 (67), 107 (30), 106 (27), 105 (27), 95 (70), 94 (29), 93 (34), 91 (53), 81 (36), 79 (60), 77 (32), 67 (54), 59 (16), 55 (25), 53 (24), 41 (38), 39 (21).
Example 30: (E)-1-(7-methylenespiro[4,5]decan-6-yl)but-2-en-1-one Ethyl 7-methylenespiro[4.5]decane-6-carboxylate (2.65 g, 11.9 mmol, prepared as described in Example 28) was transformed into the intermediate 1-(7-methylenespiro[4.5]decan-6-yl)but-3-en-1-one as described in the synthesis of (E)-1-(rel-(6S,7S)-7-methylspiro[4.5]dec-9-en-6-yl)but-2-en-1-one (Example 21) by allylmagnesium chloride addition followed by treatment of the crude product with KOt-Bu in DMF leading to 1-(7-methylenespiro[4.5]decan-6-yl)but-3-en-1-one (1.2 g, 46%) and (E)-1-(7-methylenespiro[4.5]decan-6-yl)but-2-en-1-one (0.26 g, 10%) after FC. A solution of 1-(7-methylenespiro[4.5]decan-6-yl)but-3-en-1-one (0.95 g, 4.35 mmol) and PTSA.H2O (41 mg, 0.22 mmol) in MTBE (20 ml) was heated at 40°C for 24 h, treated with PTSA.H2O (41 mg, 0.22 mmol), and further heated at 40°C for 24 h. The addition of PTSA.H2O was repeated six times every 24 h. The resulting mixture was then poured into cold water (20 ml) and aqueous 2M NaOH (3 drops) and the aqueous phase was extracted with MTBE (20 ml). The combined organic phases were washed with a saturated aqueous solution of NaCI (20 ml), dried (MgSO4), and concentrated. FC (90 g SiO2, pentane/Et2O 100:1) of the crude product (0.91 g) gave 1-(7-
methylenespiro[4.5]decan-6-yl)but-3-en-1-one (0.24 g, 25%) and (E)-1-(7-methylenespiro[4.5]decan-6-yl)but-2-en-1-one (0.39 g, 41%).
(E)-1-(7-Methylenespiro[4.5]decan-6-yl)but-2-en-1-one
Boiling point: 110°C (0.09 mbar)
13C-NMR (100MHz, CDCI3): δ199.43 (s), 146.07 (s), 141.56 (d), 131.93 (d), 111.94 (t),
64.17 (d), 46.78 (s, C(5')), 38.28 (t), 37.23 (t), 33.28 (t), 31.56 (t), 24.71 (t), 24.30 (t),
24.17 (t), 18.04 (q).
MS (El): 218 (10), 149 (27), 134 (32), 121 (9), 109 (11), 107 (15), 93 (12), 91 (18), 81
(21), 79 (17), 77 (11), 69 (100), 55 (9), 41 (31).
Odour description: fruity, spicy, agrestic, orris, ethyl safranate-like.
Example 31: (E)-1-(7-methylspiro[4,5]deca-6.8-dien-6-yl)but-2-en-1-one
a) 10-Acetyl-9-methylspiro[4.5]dec-8-en-7-one
In a Dean-Stark apparatus, a mixture of 1-cyclopentylidenepropan-2-one/1-cyclopentenylpropan-2-one (25:75, 600 g, 4.83 mol), acetylacetone (493 g, 4.83 mol), and zinc chloride (164.6 g, 1.21 mol) in benzene (500 ml) and heptane (500 ml) was heated at reflux for 2.5 d (44 ml water collected). The reaction mixture was poured into ice/water (1.51) and extracted with cyclohexane (0.6 I). The organic phase was washed with water (1 I), with a saturated aqueous solution of NaHCO3 (0.5 I), twice with a saturated aqueous solution of NaCI (1 I and 0.5 I), dried (100 g MgSO4), and concentrated (till 60°C/30 mbar). Vigreux-Distillation (0.08 mbar, bath temperature 180°C, head temp. 120-130°C) of the crude product (615 g) followed by FC (2 kg SiO2, hexane/MTBE 2:1) gave 10-acetyl-9-methylspiro[4.5]dec-8-en-7-one (20.7 g, 2.1%). Boiling point: 150°C (0.09 mbar).
13C-NMR (100MHz, CDCI3): δ206.40 (s, COMe), 199.02 (s, C(7)0), 156.23 (s, C(9)), 127.96 (d, C(8)), 64.36 (d, C(10)), 47.30 (s, C(5)), 43.95 (t), 39.04 (t), 37.13 (t), 33.01 (q), 24.10 (q), 23.58 (t), 23.07 (t).
MS (El): 206 (1), 191 (1), 164 (38), 149 (4), 135 (8), 122 (100), 121 (16), 107 (13), 91 (12), 77 (10), 67 (5), 43 (27).
b) 1 -(9-Hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone
A solution of 10-acetyl-9-methylspiro[4.5]dec-8-en-7-one (8.8 g, 42.7 mmol) in methanol (90 ml) was treated with anhydrous cerium trichloride (10.5 g, 27.3 mmol). The resulting mixture was stirred for 30 min., cooled to -65°C, and treated within 20 min. with sodium borohydride (0.84 g, 21.3 mmol) in methanol (60 ml). The resulting mixture was stirred for 45 min. at -65°C, poured into 2N aqueous HCI and ice, and extracted twice with MTBE (100 ml). The combined organic phases were washed with water (100 ml), aqueous solution of NaCI (80 ml), dried (MgSO4) and concentrated. FC (SiO2, hexane/MTBE 3:1) of the crude product (8.0 g) gave a 8:92 mixture of cis/trans-1-(9-hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone (5.31 g, 60%).
trans -1-(9-Hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone 13C-NMR (100MHz, CDCI3): (5210.53 (s), 133.32 (s), 128.57 (d), 66.23 (d), 62.95 (d), 45.90 (s), 38.44 (t), 37.95 (t), 37.48 (t), 31.85 (q), 23.32 (t), 23.19 (t), 23.02 (q). MS (El): 208 (1), 193 (3), 175 (1), 165 (5), 148 (25), 147 (24), 133 (10), 125 (38), 119 (17), 106 (90), 105 (100), 91 (40), 81 (11), 79 (19), 77 (17), 67 (12), 55 (15), 43 (54).
c) 10-Acetyl-9-methylspiro[4.5]dec-8-en-7-yl acetate
A mixture of 8:92 cis/trans -1-(9-hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone (4.2 g, 20.2 mmol) was treated with acetic anhydride (4 ml, 42.3 mmol) and sodium acetate (1.65 g, 20.2 mmol). The resulting mixture was stirred at 80°C for 1 h, poured into cold 2N aqueous NaOH (50 ml), and extracted twice with MTBE (40 ml). The combined organic phases were washed with water (40 ml), with a saturated aqueous solution of NaCI (40 ml), dried (MgSO4), and concentrated. FC (300 g SiO2, hexane/MTBE 8:1) of the crude product (4.82 g) gave 8:92 cis/trans-10-acetyl-9-methylspiro[4.5]dec-8-en-7-yl acetate (4.1 g, 82%).
trans-10-Acetyl-9-methylspiro[4.5]dec-8-en-7-yl
13C-NMR (100MHz, CDCI3): (5209.65 (s), 170.98 (s), 135.55 (s), 124.10 (d), 69.40 (d), 62.84 (d), 45.52 (s), 37.96 (t), 37.42 (t), 34.04 (t), 31.69 (q), 23.36 (t), 23.29 (t), 23.12 (q), 21.35 (q).
d) 1-(7-Methylspiro[4.5]deca-6,8-dien-6-yl)ethanone
A solution of 8:92 cis/trans-10-acetyl-9-methylspiro[4.5]dec-8-en-7-yl acetate (4.1 g, 16.4 mmol) in DBU (30 ml) was stirred for 19 h at 40°C. The reaction mixture was poured into cold 2N aqueous HCI (100 ml), and extracted twice with cyclohexane (50
ml). The combined organic phases were washed with water (50 ml), with a saturated aqueous solution of NaCI (40 ml), dried (MgSO4), concentrated. FC (500 g SiO2, hexane/MTBE 50:1) of the crude product (2.92 g) gave methyl 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone (2.25 g, 72%).
13C-NMR (100MHz, CDCI3): δ208.57 (s), 141.47 (s), 128.80 (d), 127.30 (of), 127.11 (s), 44.82 (s, C(5')), 35.88 (t), 35.25 (t, 2 C), 33.13 (g, MeCO), 23.48 (t, 2 C), 19.03 (q). MS (El): 190 (5), 175 (70), 157 (15), 147 (73), 133 (18), 131 (18), 119 (20), 115 (12), 105 (100), 91 (31), 77 (19), 65 (10), 43 (53).
e) 3-Hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1-one
Prepared in 68% yield after FC (300 g SiO2, hexane/MTBE 4:1 to 3:1) from methyl 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone (2.25 g, 11.8 mmol), LDA, acetaldehyde as described in Example 10.
13C-NMR (100MHz, CDCI3): δ212.12 (s), 140.40 (s), 128.68 (d), 128.00 (s), 127.76 (d), 63.70 (d), 53.28 (t), 45.00 (s. C(5')), 35.69 (t), 35.32 (t), 35.17 (t), 23.35 (t, 2 C), 22.25 (q), 19.03(q).
MS (El): 234 (1), 216 (2), 201 (5), 190 (2), 187 (4), 175 (66), 159 (14), 147 (79), 133 (12), 131 (22), 119 (18), 117 (13), 115 (14), 105 (100), 91 (33), 77 (19), 69 (11), 45 (13), 43 (32).
f) (E)-1 -(7-Methylspiro[4.5]deca-6,8-dien-6-yl)but-2-en-1 -one
Prepared in 69% yield from 3-hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1-one (1.88 g, 8.0 mmol), acetic anhydride (1.6 ml) and sodium acetate (0.72 g) as described in Example 10. Boiling point: 120°C (0.09 mbar).
Odour description: Damascone-like, agrestic, fruity.
13C-NMR (100MHz, CDCI3): δ201.45 (s), 146.12 (d), 138.60 (s), 134.65 (d), 128.79 (d),
128.41 (s), 127.12 (d), 45.13 (s, C(5')), 35.50 (t), 35.40 (t, 2 C), 23.33 (t, 2 C), 19.37 (q),
18.37(q).
MS (El): 216 (9), 201 (18), 187 (20), 173 (58), 159 (67), 147 (89), 146 (37), 145 (45),
131 (23), 117 (16), 115 (21), 105 (100), 91 (36), 77 (23), 69 (64), 41 (44), 39 (19).
Example 32: (E)-1 -(7-methylenespiro[4,5]dec-8-en-6-yl)but-2-en-1 -one
a) 1-(7-Methylenespiro[4.5]dec-8-en-6-yl)ethanone
At 20oC, a solution of 8:92 cis-/trans-1-(9-hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone (2 g, 9.7 mmol, prepared as described in Example 31) in toluene (20 ml) was treated with para-toluenesulfonic acid monohydrate (100 mg, 0.53 mmol) and molecular sieves, stirred for 16 h, treated with PTSA.H2O (50 mg, 0.26 mmol), stirred for 4 h, treated with PTSA.H2O (20 mg, 0.11 mmol), stirred for 3 h, treated with PTSA.H2O (10 mg, 0.05 mmol), stirred for 19 h, treated with PTSA.H2O (14 mg, 0.05 mmol), stirred for 2 h, treated with PTSA.H2O (20 mg, 0.07 mmol), stirred for 6 h, poured into ice / saturated aqueous NaHCO3 solution, and extracted three times with MTBE (30 ml). The organic phase was washed twice with a saturated aqueous solution of NaCI, dried (MgSO4) and concentrated. FC (200 g SiO2, hexane/MTBE 25:1) of the crude product (2 g) gave a 3:90:7 mixture of 1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)ethanone, 1-(7-methylenespiro[4.5]dec-8-en-6-yl)ethanone, and 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone (0.87 g, 47%) and recovered starting material (0.12 g, 6%).
1-(7-Methylenespiro[4.5]dec-8-en-6-yl)ethanone
13C-NMR (100MHz, CDCI3): δ208.47 (s), 140.79 ($), 130.40 (d), Ml.25 (d), 115.29 (t),
63.80 (d, C(6')), 43.70 (s, C(5')), 39.01 (t), 37.73 (t), 35.16 (t), 30.02 (qf), 24.49 (t), 23.65
(t).
MS (El): 190 (1), 175 (3), 147 (85), 105 (100), 91 (36), 79 (23), 77 (19), 67 (9), 65 (9),
43 (41).
b) 3-Hydroxy-1 -(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1 -one
At -70°C under N2, a solution of diisopropylamine (0.91 ml, 6.5 mmol) in anhydrous THF (10 ml) was treated dropwise with a solution of 1.6M n-BuLi in hexane (4 ml, 6.5 mmol). The resulting solution was stirred for 20 min., and treated dropwise with a solution of a 3:90:7 mixture of 1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)ethanone, 1-(7-methylenespiro[4.5]dec-8-en-6-yl)ethanone, and 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone (0.94 g, 4.98 mmol) in anhydrous THF (4 ml). The resulting solution was stirred for 45 min. at -50°C, treated with a solution of acetaldehyde (1.2 ml, 20 mmol) in anhydrous THF (4 ml). The resulting solution was stirred at -40°C for 1 h, poured into a mixture of ice and 2N HCI, and extracted three times with MTBE (25 ml). The combined organic phases washed with a saturated aqueous solution of NaCI, dried (MgSO4), and
concentrated. FC (40 g SiO2, hexane/MTBE 10:1) of the crude product (1.3 g) gave 3-hydroxy-1-(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1-one (0.788 g, 68%, 3:1 diast. mixture)
Major diastereoisomer
13C-NMR (100MHz, CDCI3): (5211.96 (s), 140.16 (s), 130.49 (d), 127.20 (d), 115.57 (t), 63.75 (d), 63.56 (d), 50.41 (t), 43.81 (s, C(5')), 39.03 (t), 37.76 (t), 35.13 (t), 24.44 (t), 23.57 (t), 22.10 (q).
Minor diastereoisomer
13C-NMR (100MHz, CDCI3): δ211.83 (s), 140.23 (s), 130.65 (d), 126.93 (d), 115.37 (t), 63.99 (d), 63.41 (d), 50.65 (t), 43.87 (s, C(5')), 38.98 (t), 37.81 (t), 35.25 (t), 24.49 (t), 23.57(t), 22.10 (q).
c) A mixture of 3-hydroxy-1-(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1-one (0.65 mg, 2.77 mmol, 3:1 diastereomeric mixture), acetic anhydride (0.55 ml, 5.8 mmol) and sodium acetate (0.25 g, 3.0 mmol) was stirred at 80°C for 7 h, treated with sodium acetate (0.1 g, 1.2 mmol), stirred at 80°C for 7 h, cooled to 0°C, poured into cold saturated aqueous NaHCO3 (20 ml), and extracted three times with MTBE (10 ml). The combined organic phases were washed with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. FC (30 g SiO2, hexane/MTBE 40:1) of the crude product (0.49 g) gave (E)-1-(7-methylenespiro[4.5]dec-8-en-6-yl)but-2-en-1-one (0.34 g, 57%). Boiling point: 100°C (0.07 mbar). Odour description: Damascone-like, earthy, spicy.
13C-NMR (100MHz, CDCI3): δ199.04 (s), 142.40 (d), 140.71 (s), 130.86 (d), 130.51 (d), 127.69 (d), 115.33 (t), 61.06 (d, C(6')), 43.96 (s, C(5')), 39.15 (t), 37.49 (t), 35.37 (t), 24.47(t),23.78(t), 18.18(q).
MS (El): 216 (3), 201 (3), 188 (4), 147 (62), 133 (8), 132 (6), 131 (10), 117 (10), 105 (46), 91 (26), 84 (4), 79 (17), 77 (16), 69 (100), 41 (31).
Example 33: (E)-1-(7-methylspiro[4,5]deca-7.9-dien-6-yl)but-2-en-1-one
a) 1-(7-Methylspiro[4.5]deca-7,9-dien-6-yl)ethanone
A solution of 8:92 cis-/trans -1-(9-hydroxy-7-methylspiro[4.5]dec-7-en-6-yl)ethanone
(2.69 g, 13 mmol, prepared as described in Example 31) in toluene (25 ml) was treated

with para-toluenesulfonic acid monohydrate (250 mg, 1.3 mmol), heated at reflux for 45 min., cooled to 0°C, poured into ice / saturated aqueous NaHCO3 solution, and the aqueous phase was extracted with MTBE (30 ml). The combined organic phases were washed three times with a saturated aqueous solution of NaCI, dried (MgSO4) and concentrated. FC (240 g SiO2, hexane/MTBE 25:1) of the crude product (3 g) gave a 58:13:29 mixture of 1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)ethanone, 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone, and 1 -(7-methylenespiro[4.5]dec-8-en-6-yl)ethanone (1.89 g, 76%) and recovered starting material (0.12 g, 6%).
1-(7-Methylspiro[4.5]deca-7,9-dien-6-yl)ethanone
13C-NMR (100MHz, CDCI3): δ208.99 (s), 134.25 (d), 132.22 (s), 122.18 (d), 121.11 (d),
64.87 (d, C(6')), 45.47 (s, C(5')), 40.78 (t), 35.67 (t), 26.70 (q), 23.92 (t), 22.70 (t), 22.52
(q).
MS (El): 190 (4), 175 (1), 147 (28), 132 (1), 117 (6), 105 (100), 91 (8), 79 (5), 77 (7), 65
(3), 43 (18).
b) 3-Hydroxy-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one At -70°C under N2, a solution of diisopropylamine (1.82 ml, 12.9 mmol) in anhydrous THF (20 ml) was treated dropwise with a solution of 1.6M n-BuLi in hexane (8.1 ml, 12.9 mmol). The resulting solution was stirred for 20 min., and treated dropwise with a solution of a 58:13:29 mixture of 1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)ethanone, 1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)ethanone, and 1 -(7-methylenespiro[4.5]dec-8-en-6-yl)ethanone (1.89 g, 9.93 mmol) in anhydrous THF (10 ml). The resulting solution was stirred for 45 min. at -60°C, treated with a solution of acetaldehyde (2.4 ml, 40 mmol) in anhydrous THF (10 ml). The resulting solution was stirred at -40°C for 1 h, poured into a mixture of ice and 2N HCI, and extracted three times with MTBE (100 ml). The combined organic phases washed three times with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. FC (250 g SiO2, hexane/MTBE 10:1) of the crude product (2.4 g, α/ß/ 65:12:23) gave a 86:14 mixture of 3-hydroxy-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one and 3-hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1-one (0.95 g, 40%) and a 63:9:28 mixture of 3-hydroxy-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one, 3-hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1 -one, and 3-hydroxy-1 -(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1-one (0.358 g, 15%) which after additional FC (30 g SiO2, hexane/MTBE 10:1) gave a 81:14:3 mixture of 3-hydroxy-1-(7-
methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one, 3-hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1 -one, and 3-hydroxy-1 -(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1-one (0.2 g).
3-Hydroxy-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one (major diastereoisomer) 13C-NMR (100MHz, CDCI3): δ212.46 (s), 134.51 (d), 131.96 (s), 122.25 (d), 121.54 (d), 64.57 (d), 64.16 (d), 46.79 (t), 45.66 (s, C(5')), 41.02 (t), 35.46 (t), 23.11 (t), 22.85 (q), 22.50 (t), 22.22 (q).
MS (El): 234 (1), 216 (1), 201 (1), 190 (1), 175 (2), 147 (37), 131 (3), 105 (100), 91 (8), 87 (4), 79 (5), 77 (7), 45 (8), 43 (13).
c) (E)-1-(7-Methylspiro[4.5]deca-7,9-dien-6-yl)but-2-en-1-one
A 81:14:3 mixture of 3-hydroxy-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)butan-1-one, 3-hydroxy-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)butan-1-one, and 3-hydroxy-1-(7-methylenespiro[4.5]dec-8-en-6-yl)butan-1-one (0.2 g, 0.85 mmol), acetic anhydride (0.17 ml, 1.8 mmol) and sodium acetate (77 mg, 3.0 mmol) was stirred at 80°C for 16 h, treated with sodium acetate (30 mg, 0.37 mmol), stirred at 80°C for 2 h, cooled to 0°C, poured into cold saturated aqueous NaHCO3 (20 ml), and extracted three times with MTBE (10 ml). The combined organic phases were washed twice with a saturated aqueous solution of NaCI, dried (MgSO4), and concentrated. FC (30 g SiO2, hexane/MTBE 60:1) of the crude product (0.2 g) gave (E)-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)but-2-en-1-one (0.139 g, 77%). Boiling point: 100°C (0.07 mbar).
Odour description: floral, Damascenone-like, slightly green.
13C-NMR (100MHz, CDCI3): δ198.42 (s), 142.70 (d), 134.52 (s), 131.87 (d), 128.95 (d), 122.04 (d), 121.39 (d), 62.90 (d, C(6')), 45.53 (s, C(5')), 41.15 (t), 35.87 (t), 23.81 (t), 22.68 (q), 22.37 (t), 18.22 (q).
MS (El): 216 (5), 201 (1), 188 (1), 147 (36), 131 (4), 117 (4), 105 (100), 91 (9), 79 (5), 77 (7), 69 (24), 41 (11).
Example 34: (E)-1-(Spiro[4,5]deca-2.6-dien-6-yl)but-2-en-1-one
a) Spiro[4.5]dec-2-en-6-one
A solution of cyclohexanone (98.1 g, 1 mol), allyl alcohol (127.8 g, 2.2 mol),
dimethoxypropane (114.6 g, 1.1 mol), and PTSA.H2O (0.1 g, 0.5 mmol) in toluene (0.5I)
was heated at reflux in a flask equiped with a microdistillation column (30 x 2.5 cm, filled with Raschig rings). After collecting the fractions distilling at 25-60°C and 60-110°C, the residue (120 g) was distilled using a 10 cm- Vigreux-column (0.07-0.06 mbar, head temperature: 57°C) giving 2-allylcyclohexanone (99.1 g, 72%).
13C-NMR (100MHz, CDCI3): (5212.14 (s), 136.38 (d), 116.05 (t), 50.14 (d), 41.93 (t), 33.69 (t), 39.29 (t), 27.85 (t), 24.87 (t).
MS (El): 138 (36), 123 (21), 110 (18), 109 (52), 97 (19), 96 (12), 95 (59), 94 (74), 81 (48), 79 (74), 67 (100), 55 (61), 54 (61), 53 (35), 41 (86), 39 (57).
A solution of 2-allylcyclohexanone (50 g, 0.36 mol), allyl alcohol (46.2 g, 0.8 mol), dimethoxypropane (41.4 g, 0.4 mol), and PTSA.H2O (35 mg, 0.18 mmol) in toluene (0.251) was heated at reflux in a flask equiped with a microdistillation column (30 x 2.5 cm, filled with Raschig rings). After collecting the fractions distilling at 25-60°C and 60-110°C, the residue (58 g) was distilled using a 10 cm-Vigreux-column giving a 28:72 mixture of 2-allylcyclohexanone/diallylcyclohexanones (36.85 g, 0.06 mbar, head temperature: 60oC) and 6,6-diallylcyclohexanone (6.74 g, 10%, contaminated with 20% 2,6-diallycyclohexanone, 0.06 mbar, head temperature: 60°C). The first fraction was redistilled using a microdistillation column (20 x 1.0 cm, filled with 3x3 mm rolled wire netting) giving additional 6,6-diallylcyclohexanone (22.56 g, 35%, contaminated with 20% 2,6-diallycyclohexanone, 0.07 mbar, head temperature: 61-70°C).
6,6-Diallylcyclohexanone
13C-NMR (100MHz, CDCI3): δ214.01 (s), 133.62 (d, 2 C), 118.00 (t, 2 C), 51.44 (s),
39.28 (t), 39.24 (t, 2 C), 35.93 (t), 27.02 (t), 20.77 (t).
MS (El): 178 (8), 163 (3), 150 (4), 149 (8), 137 (49), 135 (43), 123 (13), 119 (16), 109
(16), 98 (11), 95 (24), 93 (46), 91 (39), 81 (31), 79 (60), 77 (28), 67 (100), 55 (55), 53
(29), 41 (69), 39 (41).
2,6-Diallylcyclohexanone
13C-NMR (100MHz, CDCI3): δ214.64 (s), 135.89 (d, 2 C), 116.44 (t, 2 C), 48.43 (d, 2
C), 34.54 (t, 2 C), 32.08 (t, 2 C), 20.31 (t).
A solution of a 80:20 mixture of 6,6- and 2,6-diallylcyclohexanone (22.0 g, 0.123 mol) in 1,2-dichloroethane (300 ml) was treated with PhCH=Ru(PCy3)2CI2 (10.2 g, 12.3 mmol).
The resulting mixture was stirred at 60°C for 24 h and concentrated. Ball-to-ball distillation (25-140°C, 0.1 mbar) of the residue (30.68 g) followed by FC (800 g SiO2, hexane/MTBE 30:1) of the volatile fraction (14.9 g) gave spiro[4.5]dec-2-en-6-one (14.1 g, 95%).
13C-NMR (100MHz, CDCI3): δ213.06 (s), 127.81 (d, 2 C), 55.73 (s, C(5)), 41.72 (t, 2 C), 40.12 (t), 39.48 (t), 27.19 (t), 22.26 (t).
MS (El): 150 (96), 135 (41), 121 (33), 108 (34), 107 (48), 106 (49), 93 (81), 91 (43), 80 (63), 79 (100), 77 (58), 67 (25), 66 (37), 65 (29), 55 (38), 41 (29), 39 (45).
b) 1-(Spiro[4.5]deca-2,6-dien-6-yl)ethanone
Prepared as described in Example 10, from spiro[4.5]dec-2-en-6-one via 6-ethynylspiro[4.5]dec-2-en-6-ol (lithium acetylide ethylene diamine complex, THF, 53%) that was transformed into crude 6-ethynylspiro[4.5]deca-2,6-diene (POCI3, pyridine, 90°C, 3.5 h) leading after cone H2S(VAcOH treatment (85°C, 1 h) to 1-(spiro[4.5]deca-2,6-dien-6-yl)ethanone (61%, 2 steps).
6-Ethynylspiro[4.5]dec-2-en-6-ol
13C-NMR (100MHz, CDCl3): δ129.24 {d), 128.73 (d), 86.99 (s), 73.76 (s), 73.06 (d),
49.60 (s, C(5)), 42.89 (br. t), 39.48 (br.t) 36.68 (t), 35.14 (br. 0, 22.26 (br. 0, 21.46 (t).
MS (El): 176 (1), 175 (3), 161 (10), 158 (45), 148 (19), 147 (18), 143 (62), 133 (27), 130
(54), 129 (77), 128 (30), 120 (23), 119 (25), 117 (41), 116 (35), 115 (49), 105 (40), 91
(100), 79 (97), 77 (72), 67 (56), 66 (47), 65 (38), 55 (42), 53 (70), 51 (27), 41 (37), 39
(46).
6-Ethynylspiro[4.5]deca-2,6-diene
13C-NMR (100MHz, CDCI3): δ136.56 (d), 128.89 (d, 2 C), 128.37 (s), 83.81 (s), 76.76
(d), 45.98 {t, 2 C), 44.03 (s, C(5)), 36.56 (t), 26.00 (t), 19.25 (t).
MS (El): 158 (28), 157 (12), 143 (42), 130 (51), 129 (100), 128 (67), 116 (21), 115 (69),
103 (17), 91 (37), 77 (31), 65 (18), 63 (19), 51 (22), 39 (21).
1-(Spiro[4.5]deca-2,6-dien-6-yl)ethanone
13C-NMR (100MHz, CDCI3): δ199.67 (s, CO), 146.22 (s, C(6)), 141.68 (d, C(7)), 128.75
(d, 2 C), 46.68 (t, 2 C), 42.10 (s, C(5)), 38.93 (t), 27.14 (q), 26.63 (t), 18.65 (t).
MS (El): 178 (1), 161 (18), 148 (19), 147 (18), 135 (39), 133 (80), 117 (15), 115 (13), 105 (56), 91 (100), 79 (28), 77 (36), 65 (18), 51 (16), 43 (75), 39 (20).
c)(E)-1-(Spiro[4.5]deca-2,6-dien-6-yl)but-2-en-1-one
Prepared as described in Example 10, from 1-(spiro[4.5]deca-2,6-dien-6-yl)ethanone via 3-hydroxy-1-(spiro[4.5]deca-2,6-dien-6-yl)butan-1-one (LDA, acetaldehyde, THF, 72% after FC (SiO2, hexane/MTBE 1:1); 17% starting material recovered) and subsequent AczO/AcONa treatment (35% after FC (SiO2, hexane/MTBE 30:1)). Boiling point: 110°C (0.08 mbar).
Odour description: rosy, green, fruity.
13C-NMR (100MHz, CDCI3): δ193.02 (s, CO), 146.20 (s), 142.18 (d), 139.17 (d), 129.15 (d), 128.81 (d, 2 C), 46.61 (t, 2 C), 42.40 (s, C(5)), 38.56 (t), 26.20 (t), 18.74 (t),18.25
(q).
MS (El): 202 (37), 187 (75), 174 (19), 173 (45), 161 (46), 159 (49), 145 (41), 133 (29), 131 (47), 117 (37), 115 (28), 105 (38), 95 (43), 91 (100), 79 (34), 77 (54), 69 (57), 67 (20), 65 (27), 55 (24), 51 (20), 41 (68), 39 (43).
Example 35: Perfume composition
Ingredients parts by weight 1/1000
Citronellyl Acetate 50
Agrumex (2-tert-butylcyclohexyl acetate) 150
Phenyl Ethyl Alcohol 100
Iso C11 Aldehyde (undec-9-enal) 2
Citronellol 225
Cyclal C (main component: 2,4-dimethy!-3-cyclohexen-1-carbaldehyde) 4
Eugenol 10
Beta lonone 50
Isoraldeine® 70 (mixture of CAS 1335-46-2, 127-51 -5, 127-42-4) 100
Linalool (3,7-dimethylocta-1,6-dien-3-ol) 150
Pandanol ((2-methoxyethyl)benzene) 2
Peonile® (2-cyclohexylidene-2-phenylacetonitrile) 150
Rose Oxide (4-methyl-2-(2-methylprop-1-enyl)tetrahydro-2H-pyran) 5
(E)-1-(rel-(6S,7R)-7-Methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one 2
The addition of (E)-1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one of Example 1 imparts a very positive aspect to this floral fruity fragrance up to the dry-out stage. With its very specific plum 'Mirabelle' tone, the rose ketone related character of (E)-1-(rel-(6S,7R)-7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one enhances the natural scent of the rose petals accord and enriches the honey accord.







Claims
1. The use as fragrance of a compound of formula (I)
(Formula Removed)
wherein
n is 1, 2, 3, or 4; mis 0 or 1;
R1 is selected from C1-C4 alkoxy, C3-C4 cycloalkyloxy, C2-C4 alkenoxy, C2-C5 alkyl, C2-C5
alkenyl, cyclopropyl, 2-methylcyclopropyl, 1-methylcyclopropyl, and
cyclopropylmethyloxy;
R2 is selected from hydrogen, methyl, ethyl, methylene, and ethylidene;
ring A is saturated, or unsaturated comprising 1 double bond or 2 double bonds;
ring B is saturated, or unsaturated comprising 1 double bond or 2 double bonds.
2. Use according to claim 1 wherein the compound of formula (I) is selected from the group
consisting of
(E)-1-(7-methylspiro[4.5]dec-8-en-6-yl)but-2-en-1-one; methyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate; ethyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate;
allyl 7-methylspiro[4.5]dec-8-ene-6-carboxylate; methyl 7-methylspiro[4.5]decane-6-carboxylate; ethyl 7-methylspiro[4.5]decane-6-carboxylate; 1-(7-methylspiro[4.5]decan-6-yl)butan-1-one; 1-(7-methylspiro[4.5]dec-8-en-6-yl)butan-1-one; (E)-1-(7-methylspiro[4.5]decan-6-yl)but-2-en-1-one; (E)-1-(spiro[4.5]dec-6-en-6-yl)but-2-en-1 -one; (E)-1 -(5-methylspiro[2.5]oct-6-en-4-yl)but-2-en-1 -one; (E)-1-(5-methylspiro[2.5]oct-5-en-4-yl)but-2-en-1-one; ethyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate; (E)-1-(7-methylspiro[4.5]dec-7-en-6-yl)but-2-en-1-one; (E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one; ethyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate; ethyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate; ethyl 7-methylspiro[4.5]deca-7,9-diene-6-carboxylate; (2-methylcyclopropyl)(7-methylspiro[4.5]dec-8-en-6-yl)methanone; methyl 7-methylspiro[4.5]dec-7-ene-6-carboxylate; methyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate; ethyl 7-methylspiro[4.5]dec-6-ene-6-carboxylate; (E)-1-(7-methylspiro[4.5]dec-6-en-6-yl)but-2-en-1-one; methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate;
ethyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate; (E)-1-(7-methylspiro[4.5]dec-9-en-6-yl)but-2-en-1-one; (E)-1-(7-methylspiro[4.5]deca-6,8-dien-6-yl)but-2-en-1-one; (E)-1-(7-methylspiro[4.5]deca-7,9-dien-6-yl)but-2-en-1-one;
(E)-1 -(7-methylenespiro[4.5]dec-8-en-6-yl)but-2-en-1 -one; methyl 2-methylspiro[4.4]non-1 -ene-1 -carboxylate; ethyl 2-methylspiro[4.4]non-1 -ene-1 -carboxylate; (E)-1-(2-methylspiro[4.4]non-1-en-1-yl)but-2-en-1-one; methyl 2-methylspiro[4.4]non-2-ene-1-carboxylate ; ethyl 2-methylspiro[4.4]non-2-ene-1 -carboxylate; (E)-1 -(2-methylspiro[4.4]non-2-en-1 -yl)but-2-en-1 -one; cyclopropyl(7-methyl-spiro[4.5]dec-8-en-6-yl)methanone; (2-methylcyclopropyl)(7-methylspiro[4.5]deca-6,8-dien-6-yl)methanone; cyclopropyl(7-methylspiro[4.5]deca-6,8-dien-6-yl)methanone; methyl 7-ethylidenespiro[4.5]decane-6-carboxylate; ethyl 7-ethylidenespiro[4.5]decane-6-carboxylate; (2E)-1-(7-ethylidenespiro[4.5]decan-6-yl)but-2-en-1-one; methyl 7-methylspiro[4.5]dec-9-ene-6-carboxylate; methyl 7-methylspiro[4.5]deca-6,8-diene-6-carboxylate; methyl 7-methylenespiro[4.5]dec-8-ene-6-carboxylate; ethyl 7-methylenespiro[4.5]decane-6-carboxylate; methyl 7-methylenespiro[4.5]decane-6-carboxylate; (E)-1-(7-methylenespiro[4.5]decan-6-yl)but-2-en-1-one; (E)-1-(spiro[4.5]deca-2,6-dien-6-yl)but-2-en-1 -one; (E)-1 -(7-methylspiro[4.5]deca-2,6-dien-6-yl)but-2-en-1-one; (E)-1-(7-methylspiro[4.5]deca-2,7-dien-6-yl)but-2-en-1 -one; (E)-1-(7-methylspiro[4.5]deca-2,8-dien-6-yl)but-2-en-1-one; (E)-1-(7-methylenespiro[4.5]dec-2-en-6-yl)but-2-en-1-one; and (E)-1-(7-methylspiro[4.5]deca-2,6,8-trien-6-yl)but-2-en-1-one.
3. A fragrance composition comprising a compound of formula (I) as defined in one of the preceding claims, or a mixture thereof.
4. A method of manufacturing a fragrance application, comprising the incorporation of a compound of formula (I) as defined in one of the claims 1 to 2, or a mixture thereof, into a consumer product base.
5. A compound of formula (I)
(Formula Removed)
wherein
n is 1, 2, 3, or 4; m is 0 or 1;
R1 is selected from C1-C4 alkoxy, C3-C4 cycloalkyloxy, C2-C4 alkenoxy, C2-C5 alkyl, C2-C5
alkenyl, cyclopropyl, 2-methylcyclopropyl, 1-methylcyclopropyl, and
cyclopropylmethyloxy;
R2 is selected from hydrogen, methyl, ethyl, methylene, and ethylidene;
ring A is saturated, or unsaturated comprising 1 double bond or 2 double bonds;
provided that ethyl spiro[4.5]dec-3-ene-1-carboxylate;
ethyl spiro[2.4]hepta-4,6-diene-4-carboxylate; methyl spiro[2.4]hepta-4,6-diene-4-
carboxylate; methyl spiro[4.4]nonane-1-carboxylate; tert-butyl spiro[4.5]decane-6-
carboxylate; and methyl spiro[5.5]undec-4-ene-1-carboxylate are excluded.
6. A method of producing a compound of formula (I)

(Formula Removed)
wherein n is 1, 2, 3, or 4; m is 0 or 1;
R1 is selected from C1-C4 alkoxy, C3-C4 cycloalkyloxy, C2-C4 alkenoxy, C2-C5 alkyl,
C2-C5 alkenyl, cyclopropyl, 2-methylcyclopropyl, 1-methylcyclopropyl, and
cyclopropylmethyloxy;
R2 is selected from hydrogen, methyl, ethyl, methylene, and ethylidene;
ring A is saturated, or unsaturated comprising 1 double bond or 2 double bonds;
comprising elimination of HX from a compound of formula (II)
(Formula Removed)
wherein n, m, R1 and R2 have the same meaning as given above for formula (I);
ring A is saturated or unsaturated comprising 1 double bond;
ring B is saturate, or unsaturated comprising 1 double bond or 2 double bonds; and
X is selected from -OR" wherein R" is selected from hydrogen, C1-C12 alkyl, or C2-C12 alkenyl, -O-C(O)R'" wherein R'" is C1 to C12 alkyl, and -O-CO2RIV wherein RIV is C1 to C12 alkyl, and X is bound to C-2, C-3 or C-4;
under acidic or basic conditions.

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Patent Number 279540
Indian Patent Application Number 7819/DELNP/2009
PG Journal Number 04/2017
Publication Date 27-Jan-2017
Grant Date 25-Jan-2017
Date of Filing 01-Dec-2009
Name of Patentee GIVAUDAN SA
Applicant Address CHEMIN DE LA PARFUMERIE 5, CH-1214 VERNIER, SWITZERLAND
Inventors:
# Inventor's Name Inventor's Address
1 NICOLAS ANORGA 7 RUE DU COMMANDANT GUILBAUD, 3°G, F-75016 PARIS, FRANCE
2 THIERRY GRANIER ZEISIGWEG 7, CH-8600 DUEBENDORF, SWITZERLAND
3 MARKUS GAUTSCHI UNTERDORFWAG 9, 8117 FALLANDEN, SWITZERLAND
4 BERNADETTE BOURDIN TRUNZ AV, DU PETIT-LANCY 54, CH-1213 PETIT-LANCY, SWITZERLAND.
PCT International Classification Number A61K31/24;
PCT International Application Number PCT/CH08/000260
PCT International Filing date 2008-06-09
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 07290735.5 2007-06-11 EPO