PROCESS FOR THE PREPARATION OF 2,3-DIHYDROAZEPINE COMPOUNDS
申请人:Takeda Chemical Industries, Ltd.
公开号:EP1211239A1
公开(公告)日:2002-06-05
As a process for preparing 2,3-dihydroazepine compounds at low cost in a simple and easy manner, there is provided a process for the preparation of compounds of the formula:
or salts thereof, characterized in that compounds of the formula:
or salts thereof are reacted with compounds of the formula:
or salts thereof to give compounds of the formula:
or salts thereof, which are then subjected to esterification and ring-closing reaction.
The anilination of o-halogenobenzaldehyde 9 with alkylamino-acid 16 gave o-formylaniline-acid 17. Compound 17 was esterified followed by the improved reaction using the combination of alcoholate and dialkyl carbonate in one-pot, to easily produce 19. Namely, these new processes afforded the desired product 19 in only twostepsfrom the starting materials, as compared with the previous 10 steps. Moreover