Title of Invention

2,3-DIHYDRO-6-NITROIMIDAZO [2,1-B] OXAZOLE COMPOUND

Abstract

The present invention provides a 2,3-dihydro- 6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula: wherein R1 represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R2 represents a group -OR3 or the like, and R3 represents a hydrogen atom, C1-C6 alkyl group or the like, or R1 and -(CH2)nR2 may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H): wherein R41 is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against Mycobacterium tuberculosis, multi-drug- resistant Mycobacterium tuberculosis, and atypical acid-fast bacteria.

Full Text

DESCRIPTION 2,3-DIHYDRO-6-NITROIMIDAZO[2,l-b]OXAZOLE COMPOUND TECHNICAL FIELD The present invention relates to a 2,3- dihydroimidazo[2,1-b]oxazole compound. BACKGROUND ART From among acid-fast bacteria, human Mycobacterium tuberculosis has been widely known. It is said that the one-third of the human population is infected with this bacterium. In addition to the human Mycobacterium tuberculosis , Mycobacterium africanum and Mycobacterium bovis have also been known to belong to the Mycobacterium tuberoculosis group. These bacteria are known as Mycobacteria having a strong pathogenicity to humans. Against these tuberculoses, treatment is carried out using three agents, rifampicin, isoniazid, and ethambutol (or streptomycin) that are regarded as first-line agents, or using four agents such as the above three agents and pyrazinamide. However, since the treatment of tuberculosis requires extremely long-term administration of agents, it might result in poor compliance, and the treatment often ends in failure. Moreover, in respect of the above agents, it has been reported that: rifampicin causes hepatopathy, flu syndrome, drug allergy, and its concomitant administration with other drugs is contraindicated due to P450-associated enzyme induction; that isoniazid causes peripheral nervous system disorder and induces serious hepatopathy when used in combination with rifampicin; that ethambutol brings on failure of eyesight due to optic nerve disorder; that streptomycin brings on diminution of the hearing faculty due to the 8th cranial nerve disorder; and that pyrazinamide causes adverse reactions such a hepatopathy, gouty attack associated with increase of uric acid level, vomiting (A Clinician's Guide To Tuberculosis, Michael D. Iseman 2000 by Lippincott Williams & Wilkins, printed in the USA, ISBN 0-7817-1749-3, Tuberculosis, 2nd edition, Fumiyuki Kuze and Takahide Izumi, Igaku- Shoin Ltd., 1992). Actually, it has been reported that cases where the standard chemotherapy could not be carried out due to the adverse reactions to these agents made up 70% (approximately 23%, 52 cases) of the total cases where administration of the agents was discontinued (the total 228 hospitalized patients who were subject to the research) (Kekkaku, Vol. 74, 77-82, 1999). In particular, hepatotoxicity, which is induced by rifampicin, isoniazid, and ethambutol out of the 5 agents used in combination for the aforementioned first-line treatment, is known as an adverse reaction that is developed most frequently. At the same time, Mycobacterium tuberculosis resistant to antitubercular agen The present invention provides a 2,3-dihydro- 6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula: wherein R1 represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R2 represents a group -OR3 or the like, and R3 represents a hydrogen atom, C1-C6 alkyl group or the like, or R1 and -(CH2)nR2 may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H): wherein R41 is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against Mycobacterium tuberculosis, multi-drug- resistant Mycobacterium tuberculosis, and atypical acid-fast bacteria.

Documents:

600-KOLNP-2005-(20-12-2011)-CORRESPONDENCE.pdf

600-KOLNP-2005-(20-12-2011)-OTHERS.pdf

600-KOLNP-2005-1-(20-12-2011)-CORRESPONDENCE-1.pdf

600-KOLNP-2005-1-(20-12-2011)-OTHERS-1.pdf

600-KOLNP-2005-GRANTED ABSTRACT.pdf

600-KOLNP-2005-GRANTED CLAIMS.pdf