Succinic acid diester derivative, process for production thereof, and use of the derivative in the production of pharmaceutical preparation
申请人:Inagaki Takashi
公开号:US20100076203A1
公开(公告)日:2010-03-25
The present invention provides with a process of preparing an optically active succinimide derivative, which is a key intermediate for production of ranirestat. A compound (3) is easily prepared by treating the derivative of succinic acid diester of the formula (2):
wherein R
1
is an amino group protected with a group removed by hydrogenolysis or a tert-butoxycarbonylamino group and R
2
is an ethyl group optionally substituted with one or two methyl group(s) at α-position, provided that R
2
is not a tert-butyl group when R
1
is a tert-butoxycarbonylamino group; with alkali metal alkoxide and the compound (3) can be an important intermediate for production of ranirestat.