SUCCINIC ACID DIESTER DERIVATIVE, PROCESS FOR PRODUCTION THEREOF, AND USE OF THE DERIVATIVE IN THE PRODUCTION OF PHARMACEUTICAL PREPARATION

摘要

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 ±-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.