Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1994-08-05
1996-12-10
Dentz, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546308, C07D47104
Patent
active
055832296
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP93/01776 filed Dec. 7, 1993.
DETAILED DESCRIPTION OF THE INVENTION
1. Field of Industrial Application
The present invention relates to a process for the preparation of a 2-alkyl-3-(biphenyl-4-yl)methyl-3H-imidazo[4,5-b]pyridine derivative (II) which is disclosed in, e.g., Japanese Patent Publication-A Nos. 3-95181 (and European Patent Publication-A No. 420237 corresponding thereof) and 3-236377 and is a precursor of an antagonist against angiotensin II receptor useful as an antihypertensive drug and a remedy for hemal lesions, and an intermediate useful for the preparation thereof.
The present invention relates to a process for the preparation of a 2-alkyl-3-(2'-cyanobiphenyl-4-yl)methyl-3H-imidazo[4,5-b]pyridine derivative (II) which is disclosed in, e.g., Japanese Patent Publication-A Nos. 3-5480, 3-95181, 3-188076 (and European Patent Publication-A No. 426021 corresponding thereof) and 3-236377 (and European Patent Publication-A No. 420237 corresponding thereof), and Japanese Patent Application No. 4-328986 and is a precursor of an antagonist against angiotensin II receptor useful as an antihypertensive drug and a remedy for hemal lesions, and an intermediate useful for the preparation thereof.
The present invention relates to a biphenyloxazoline derivative (I) useful as an intermediate for the preparation of a medicine, a process for the preparation thereof, and an intermediate useful for the preparation thereof. More particularly, the present invention relates to a biphenyloxazoline derivative (I) that is a precursor for the substituent of the antagonist against angiotensin II receptor which is disclosed in, e.g., Japanese Patent Publication-A Nos. 3-95181 and 3-236377 (and European Patent Publication-A No. 420237 corresponding thereof) and Japanese Patent Application No. 4-328986 and is useful as an antihypertensive drug and a remedy for hemal lesions, a process for the preparation thereof, and an intermediate useful for the preparation thereof.
The present invention relates to a sulfonyloxybiphenylcarboxylic ester derivative (I) useful as an intermediate for the preparation of a medicine, a process for the preparation thereof, and an intermediate useful for the preparation thereof. More particularly, the present invention relates to a sulfonyloxy-biphenylcarboxylic ester derivative (I) that is a precursor for the substituent of the antagonist against angiotensin II receptor which is disclosed in, e.g., Japanese Patent Publication-A Nos. 3-95181 and 3-236377 (and European Patent Publication-A No. 420237 corresponding thereof) and Japanese Patent Application No. 4-328986 and is useful as an antihypertensive drug and a remedy for hemal lesions, a process for the preparation thereof, and an intermediate useful for the preparation thereof.
The present invention relates to a process for the preparation of a halomethyl-biphenylcarboxylic ester derivative (II) useful as an intermediate for the preparation of a medicine. More particularly, the present invention relates to a process for the preparation of a halomethyl-biphenylcarboxylic ester derivative (II) that is a precursor for the substituent of the antagonist against angiotensin II receptor which is disclosed in, e.g., Japanese Patent Publication-A Nos. 3-95181 and 3-236377 (and European Patent Publication-A No. 420237 corresponding thereof) and Japanese Patent Application No. 4-328986 and is useful as an antihypertensive drug and a remedy for hemal lesions.
2. Prior Art
As described in the Japanese Patent Publication-A No. 3-236377, a 2-alkyl-3-(biphenyl-4-yl)methyl-3H-imidazo[4,5-b]pyridine derivative (II) has hitherto been prepared mainly by a process which comprises nitrating a 2-aminopyridine derivative into a 2-amino-3-nitropyridine derivative, reducing it to form a 2,3-diaminopyridine derivative, conducting the N-acylation and cyclization thereof simultaneously to form a 3H-imidazo[4,5-b]pyridine ring and finally conducting the N-alkylation thereof. This preparation process of the prior art can be represented
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Furukawa Ken
Ichino Tomio
Shimizu Toshikazu
Tsurugi Tomio
Urawa Yoshio
Dentz Bernard
Eisai Co. Ltd.
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