Indian Patents. 231911:"COMPOUNDS OF N-DEACETYL THIOCOCHICINE OF FORMULA (I)"

Title of Invention	"COMPOUNDS OF N-DEACETYL THIOCOCHICINE OF FORMULA (I)"
Abstract	Derivatives of N-deacetyl-thiocolchicine or of the isoster thereof of formula (I), wherein: n is an integer of 0 to 8; Y is a CH2 group or, when n is 1, can also be a group of formula NH. Compounds (I) have anti-proliferative activity.

Full Text	The present invention relates to derivatives of N-deacetyl-thiocolchicine or of the isoster thereof of formula (I) (Formula Removed) wherein: n is an integer of 0 to 8; Y is a CH2 group or, when n is 1, can also be a group of formula NH. Colchicines and thiocolchicines are known antiblastic compounds capable of destabilizing microtubules through interaction with tubulin. Colchicine is currently used in the therapy of gout and related inflammatory conditions, but its use is restricted to the acute phases due to its high gastro-intestinal toxicity. A number of colchicine or thiocolchicine derivatives have been studied, in view of a possible use thereof as antitumor medicaments, but the efforts of researchers have to date been unsuccessful due to the often very restricted therapeutical index of such compounds. Only one colchicine derivative, demecolcine, has been used in the past in clinic for the treatment of leukemias, but with poor success. It has now been found that the compounds of formula (I) have anti¬proliferative activity, in particular on cells expressing the MDR (multi-drug resistance) phenotype, with an approximately 1:1 ratio of activity on sensitive cells to activity on resistant cells. The compounds of the invention have in fact powerful antimitotic activity and are characterized by favorable therapeutic index which makes them suitable for the therapeutical treatment of various forms of tumors, as well as for degenerative rheumatoid arthritis, a disease characterized by excessive proliferation and abnormal migration of leukocytes. Compounds (I) have cytotoxicity comparable to that of the most effective antitumor medicaments, while having a remarkably wider action spectrum, particularly against cells resistant to known drugs. Compounds (I) wherein Y is CH2 are prepared by reacting N-deacetyl-thiocolchicine with dicarboxylic acid reactive derivatives in dry solvents. Examples of suitable dicarboxylic acid reactive derivatives comprise chlorides, reactive anhydrides or esters, m particular N-hydroxysuccinyl diesters obtainabie by reacting said acids with N-hydroxy-succinimide. The reaction is preferably carried out in solvents such as ethyl ether, dioxane or tetrahydrofuran in the presence of bases, for example triethylamine. On the other hand, compounds (I) wherein Y is NH and n is 1 can be prepared by reacting N-deacetyl-thiocolchicine with N-hydroxy-succinimide in the presence of amines and condensing agents such as dicyclohexylcarbodiimide (DCC), in a suitable aprotic solvent, preferably a chlorinated hydrocarbon (methylene chloride, chloroform). Said compounds can also be obtained as side-products from the reaction between dicarboxylic acid N-hydroxysuccinyidiesters 2nd N-deacetyi-thiocolchicine The activity of these compounds was evaluated on a wide number of resistant tumour cells expressing the MDR phenotype; these compounds proved to be particularly active on different sensitive colon lines expressing MDR. The following Table reports by way of example the activity of these two compounds, comparing their biological activity to thiocolchicine and taxol as reference molecules. (Formula Removed) The cytotoxic activity was evaluated according to M.C. Alley et al., Cancer Research, 48, 589-601, 1998. The above-reported data evidence the high cytotoxic activity of the compounds of the invention on both sensitive cell lines and different drug-resistant cell lines to various antitumor drugs. The compounds of the invention are therefore useful in the treatment of proliferative pathologies and in particular tumors of various origins, rheumatoid arthritis or other degenerative pathologies wherein antiproliferative and anti¬inflammatory actions are indicated. For this purpose, compounds (I) will be administered in the form of pharmaceutical compositions suitable to the oral, parenteral, epicutaneous or transdermal administrations. The dosage of compounds (1) will range from 1 to 100 mg/m2 body area, depending on the administration route. The compounds will preferably be administered orally. Examples of compositions comprise capsules, tablets, vials, creams, solutions, granulates. In accordance with the present invention relates to a Compound of formula (l)N Deacetylthiocolchicine derivatives (Formula Removed) wherein n is integer of 0 to 8; Y is either CH2 group or group of formula NH. Examples of compositions comprise capsules, tablets, vials, creams, solutions, granulates. The following examples illustrate the invention in greater detail. EXAMPLE 1 Preparation of compound (1) wherein Y is CH) and n is 2 (Tiocol 39) 100 mg of N-deacetyl-thiocolchicine (M. W. = 373 g/mol, 0.27 mmol) are dissolved in 6 ml of dry dioxane at room temperature under nitrogen atmosphere. 46 mg of adipic acid activated as N-hydroxy succinyl diester (M. W. = 340 g/mol, 0.135 mmol) and 40 1 of dry triethylamine (M. W. = 101 g/mol, d=0. 726 g/ml, 0.27 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHC13 : MeOH = 95: 5). The solvent is evaporated off and the product is recovered by flash chromatography on silica (eluent: CHCI3 : MeOH = 75 : 1). Yield: 85% EXAMPLE 2 Preparation of the compound (1) wherein Y is NH n is 1 (Tiocol 54) A solution of 1 g of deacetyl-thiocolchicine in 40 ml of dry CH2CI2 is added with 154 mg of N-hydroxysuccinimide, 276 mg of DCC and 476 pi of diisopropylethylamine. The mixture is refluxed under nitrogen for at least 2 days. The progress of the reaction is monitored by TLC (CH2CI2-EtOH=95/5). The mixture is concentrated to small volume and the residue is taken up with ethyl acetate. The product is left to crystallize, then further purified by flash chromatography (eluent AcOEt-hexane 7/3 or (CH2CI2-EtOH=95/5). 500 mg of product are obtained. 'H-NMR (DMSO-d6-300Mhz) : 8.80 d; 7.82 br s; 7.75-7.60 S; 7.37; 7.18; 6.59; 4.90 m; 4.66 m; 4.52 dd; 3.96 s ppm. 13C-NMR (CDCI3) : 182.5; 181.9; 172.2; 158.0; 175.5; 157.1; 153.8; 153.7; 153; 152.3; 151.3; 151.2; 141.6; 141.5; 139.4; 139.3; 135.5; 135.5 d, 134.8; 134.7; 129.0; 128.4(d). MS (m/z) 866.4 [ (M+Na) +]. EXAMPLE 3 Preparation of compound (II wherein Y is CH2 and n is 6 (Tiocol 33) 200 mg of N-deacetyl-thiocolchicine (M. W. = 373 g/mol, 0.54 mmol) are dissolved in 12 ml of dry dioxane at room temperature under nitrogen atmosphere. 91.8 mg of sebacic acid activated as N-hydroxy succinyl diester (M. W. = 396 g/mol, 0.27 mmol) and 75 pLI of dry triethylamine (M. W. = 101 g/mol, d= 0.726 g/ml, 0.54 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHCI3 : MeOH = 95: 5), then after 20 hours is heated to 50°C and the solvent is evaporated off. The reaction crude is purified by flash chromatography on silica (eluent: CHCI3 : MeOH=40: 1), to obtain 30 mg of a mixture of the title compound (with Rf: =0. 3) and of the compound of example 2. EXAMPLE 4 Preparation of compound (1) wherein Y is Chu an n is 0 (Tiocol 43) Procedure A 190 mg of N-deacetyl-thiocolchicine (M. W. =373 g/mol, 0.512 mmol) are dissolved in 6 ml of dry dioxane at room temperature under nitrogen atmosphere. 80 mg of succinic acid activated as N-hydroxy succinyl diester (M. W. = 312 g/mol, 0.256 mmol) and 70 I of dry triethylamine (M. W. = 101 g/mol, d=0.726 g/ml, 0.512 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHC13 : MeOH = 95: 5). The solvent is evaporated off, the residue is taken up with AcOEt to remove the residual N-deacetyl thiocolchicine and triethylamine (the product is insoluble). Yield: 45% Procedure B 100 mg of N-deacetyl-N-succinyl-thiocolchicine (M. W. =473 g/mol, 0.21 mmol) are dissolved in 8 ml of dry CH2CI2 at room temperature under nitrogen atmosphere. 93 mg of BOP (M. W. = 442,3 g/mol, 0.21 mmol) and 60 pi of dry triethylamine (M. W. = 101 g/mol, d=0.726 g/ml, 0.42 mmol) are added. After 10 minutes, 80 mg of N-deacetyl thiocolchicine (M. W. = 101 g/mol, d=0. 726 g/ml, 0.42 mmol) are added to the mixture, which is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHCI3 : MeOH = 95: 5). The solvent is evaporated off and the residue is taken up with AcOEt to remove the residual N-deacetyl thiocolchicine and triethylamine (the product is insoluble). Yield: 45% We claim: 1. Compounds N-Deacetylthiocolchicine of formula (Formula Removed) wherein n is integer of 0 to 8; Y is either CH2 group or group of formula NH. 2. Compounds of formula (I) substantially as herein described with reference to the foregoing description table and the accompanying examples.

Full Text

The present invention relates to derivatives of N-deacetyl-thiocolchicine or of the isoster thereof of formula (I)
(Formula Removed)
wherein:
n is an integer of 0 to 8;
Y is a CH2 group or, when n is 1, can also be a group of formula NH.
Colchicines and thiocolchicines are known antiblastic compounds capable of destabilizing microtubules through interaction with tubulin.
Colchicine is currently used in the therapy of gout and related inflammatory conditions, but its use is restricted to the acute phases due to its high gastro-intestinal toxicity.
A number of colchicine or thiocolchicine derivatives have been studied, in view of a possible use thereof as antitumor medicaments, but the efforts of researchers have to date been unsuccessful due to the often very restricted therapeutical index of such compounds.
Only one colchicine derivative, demecolcine, has been used in the past in clinic for the treatment of leukemias, but with poor success.
It has now been found that the compounds of formula (I) have anti¬proliferative activity, in particular on cells expressing the MDR (multi-drug
resistance) phenotype, with an approximately 1:1 ratio of activity on sensitive cells to activity on resistant cells.
The compounds of the invention have in fact powerful antimitotic activity and are characterized by favorable therapeutic index which makes them suitable for the therapeutical treatment of various forms of tumors, as well as for degenerative rheumatoid arthritis, a disease characterized by excessive proliferation and abnormal migration of leukocytes.
Compounds (I) have cytotoxicity comparable to that of the most effective antitumor medicaments, while having a remarkably wider action spectrum, particularly against cells resistant to known drugs.
Compounds (I) wherein Y is CH2 are prepared by reacting N-deacetyl-thiocolchicine with dicarboxylic acid reactive derivatives in dry solvents. Examples of suitable dicarboxylic acid reactive derivatives comprise chlorides, reactive anhydrides or esters, m particular N-hydroxysuccinyl diesters obtainabie by reacting said acids with N-hydroxy-succinimide. The reaction is preferably carried out in solvents such as ethyl ether, dioxane or tetrahydrofuran in the presence of bases, for example triethylamine.
On the other hand, compounds (I) wherein Y is NH and n is 1 can be prepared by reacting N-deacetyl-thiocolchicine with N-hydroxy-succinimide in the presence of amines and condensing agents such as dicyclohexylcarbodiimide (DCC), in a suitable aprotic solvent, preferably a chlorinated hydrocarbon (methylene chloride, chloroform). Said compounds can also be obtained as side-products from the reaction between dicarboxylic acid N-hydroxysuccinyidiesters 2nd N-deacetyi-thiocolchicine
The activity of these compounds was evaluated on a wide number of resistant tumour cells expressing the MDR phenotype; these compounds proved to be particularly active on different sensitive colon lines expressing MDR.
The following Table reports by way of example the activity of these two
compounds, comparing their biological activity to thiocolchicine and taxol as reference molecules.
(Formula Removed)
The cytotoxic activity was evaluated according to M.C. Alley et al., Cancer Research, 48, 589-601, 1998.
The above-reported data evidence the high cytotoxic activity of the compounds of the invention on both sensitive cell lines and different drug-resistant cell lines to various antitumor drugs.
The compounds of the invention are therefore useful in the treatment of proliferative pathologies and in particular tumors of various origins, rheumatoid arthritis or other degenerative pathologies wherein antiproliferative and anti¬inflammatory actions are indicated.
For this purpose, compounds (I) will be administered in the form of pharmaceutical compositions suitable to the oral, parenteral, epicutaneous or transdermal administrations. The dosage of compounds (1) will range from 1 to 100 mg/m2 body area, depending on the administration route. The compounds will preferably be administered orally.
Examples of compositions comprise capsules, tablets, vials, creams, solutions, granulates.
In accordance with the present invention relates to a Compound of formula (l)N Deacetylthiocolchicine derivatives
(Formula Removed)
wherein n is integer of 0 to 8;
Y is either CH2 group or group of formula NH.
Examples of compositions comprise capsules, tablets, vials, creams, solutions, granulates.
The following examples illustrate the invention in greater detail.
EXAMPLE 1 Preparation of compound (1) wherein Y is CH) and n is 2 (Tiocol 39) 100 mg of N-deacetyl-thiocolchicine (M. W. = 373 g/mol, 0.27 mmol) are dissolved in 6 ml of dry dioxane at room temperature under nitrogen atmosphere.
46 mg of adipic acid activated as N-hydroxy succinyl diester (M. W. = 340 g/mol, 0.135 mmol) and 40 1 of dry triethylamine (M. W. = 101 g/mol, d=0. 726 g/ml, 0.27 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHC13 : MeOH = 95: 5). The solvent is evaporated off and the product is recovered by flash chromatography on silica (eluent: CHCI3 : MeOH = 75 : 1).
Yield: 85%
EXAMPLE 2 Preparation of the compound (1) wherein Y is NH n is 1 (Tiocol 54) A solution of 1 g of deacetyl-thiocolchicine in 40 ml of dry CH2CI2 is added with 154 mg of N-hydroxysuccinimide, 276 mg of DCC and 476 pi of diisopropylethylamine. The mixture is refluxed under nitrogen for at least 2 days.
The progress of the reaction is monitored by TLC (CH2CI2-EtOH=95/5). The mixture is concentrated to small volume and the residue is taken up with ethyl acetate. The product is left to crystallize, then further purified by flash chromatography (eluent AcOEt-hexane 7/3 or (CH2CI2-EtOH=95/5). 500 mg of product are obtained.
'H-NMR (DMSO-d6-300Mhz) : 8.80 d; 7.82 br s; 7.75-7.60 S; 7.37; 7.18; 6.59; 4.90 m; 4.66 m; 4.52 dd; 3.96 s ppm.
13C-NMR (CDCI3) : 182.5; 181.9; 172.2; 158.0; 175.5; 157.1; 153.8; 153.7; 153; 152.3; 151.3; 151.2; 141.6; 141.5; 139.4; 139.3; 135.5; 135.5 d, 134.8; 134.7; 129.0; 128.4(d).
MS (m/z) 866.4 [ (M+Na) +].
EXAMPLE 3 Preparation of compound (II wherein Y is CH2 and n is 6 (Tiocol 33) 200 mg of N-deacetyl-thiocolchicine (M. W. = 373 g/mol, 0.54 mmol) are dissolved in 12 ml of dry dioxane at room temperature under nitrogen atmosphere. 91.8 mg of sebacic acid activated as N-hydroxy succinyl diester (M. W. = 396 g/mol, 0.27 mmol) and 75 pLI of dry triethylamine (M. W. = 101 g/mol, d= 0.726 g/ml, 0.54 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHCI3 : MeOH = 95: 5), then after 20 hours is heated to 50°C and the solvent is evaporated off.
The reaction crude is purified by flash chromatography on silica (eluent: CHCI3 : MeOH=40: 1), to obtain 30 mg of a mixture of the title compound (with Rf: =0. 3) and of the compound of example 2.
EXAMPLE 4 Preparation of compound (1) wherein Y is Chu an n is 0 (Tiocol 43) Procedure A 190 mg of N-deacetyl-thiocolchicine (M. W. =373 g/mol, 0.512 mmol) are dissolved in 6 ml of dry dioxane at room temperature under nitrogen atmosphere.
80 mg of succinic acid activated as N-hydroxy succinyl diester (M. W. = 312 g/mol, 0.256 mmol) and 70 I of dry triethylamine (M. W. = 101 g/mol, d=0.726 g/ml, 0.512 mmol) are added. The mixture is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHC13 : MeOH = 95: 5). The solvent is evaporated off, the residue is taken up with AcOEt to remove the residual N-deacetyl thiocolchicine and triethylamine (the product is insoluble).
Yield: 45% Procedure B 100 mg of N-deacetyl-N-succinyl-thiocolchicine (M. W. =473 g/mol, 0.21 mmol) are dissolved in 8 ml of dry CH2CI2 at room temperature under nitrogen atmosphere. 93 mg of BOP (M. W. = 442,3 g/mol, 0.21 mmol) and 60 pi of dry triethylamine (M. W. = 101 g/mol, d=0.726 g/ml, 0.42 mmol) are added. After 10 minutes, 80 mg of N-deacetyl thiocolchicine (M. W. = 101 g/mol, d=0. 726 g/ml, 0.42 mmol) are added to the mixture, which is stirred at room temperature under nitrogen atmosphere for 48 hours (TLC control: CHCI3 : MeOH = 95: 5). The solvent is evaporated off and the residue is taken up with AcOEt to remove the residual N-deacetyl thiocolchicine and triethylamine (the product is insoluble).
Yield: 45%

We claim:
1. Compounds N-Deacetylthiocolchicine of formula (Formula Removed)

wherein n is integer of 0 to 8;
Y is either CH2 group or group of formula NH.
2. Compounds of formula (I) substantially as herein described with reference to the foregoing description table and the accompanying examples.

Documents:

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inpct-2002-00759-del-assignment.pdf

inpct-2002-00759-del-claims.pdf

inpct-2002-00759-del-complete specification [granted].pdf

inpct-2002-00759-del-correspondence-others.pdf

inpct-2002-00759-del-correspondence-po.pdf

inpct-2002-00759-del-description (complete).pdf

inpct-2002-00759-del-form-1.pdf

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inpct-2002-00759-del-gpa.pdf

inpct-2002-00759-del-pct-210.pdf

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inpct-2002-00759-del-pct-416.pdf

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Patent Number

231911

Indian Patent Application Number

IN/PCT/2002/00759/DEL

PG Journal Number

13/2009

Publication Date

27-Mar-2009

Grant Date

13-Mar-2009

Date of Filing

02-Aug-2002

Name of Patentee

INDENA S.P.A.

Applicant Address

VIALE ORTLES, 12, I-20139 MILANO, ITALY.

Inventors:

#	Inventor's Name	Inventor's Address
1	BOMBARDELLI, EZIO	VIA VAL DI SOLE,22, I-20141, MILANO,ITALY.
2	PONTIROLI, ALESSANDRO	VIALE ORTLES 12, I-20139,MILANO, ITALY

PCT International Classification Number

C07C 323/41

PCT International Application Number

PCT/EP01/02739

PCT International Filing date

2001-03-12

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	MI2000A000554	2002-03-17	Italy