申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US05616715A1
公开(公告)日:1997-04-01
A process is provided for producing diastereoisomer A or a pharmaceutically acceptable acid addition salt of 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-(1-benzylpyrrolidin-3-yl) ester 5-methyl ester which comprises subjecting a mixture of diastereoisomers A and B of 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-(1-benzylpyrrolidin-3-yl) ester 5-methyl ester to column chromatography using silica gel as a carrier and a mixture of ethyl acetate and acetic acid as an eluant, and then separating the acetate of diastereoisomer A from the eluate, or treating the acetate with a base, or further treating the resulting diastereoisomer A with a pharmaceutically acceptable acid.
提供了一种生产对映异构体A或2,6-二甲基-4-(3-硝基苯基)-1,4-二氢吡啶-3,5-二羧酸3-(1-苄基吡咯烷基)酯5-甲酯的药物可接受的酸盐的方法,包括将2,6-二甲基-4-(3-硝基苯基)-1,4-二氢吡啶-3,5-二羧酸3-(1-苄基吡咯烷基)酯5-甲酯的对映异构体A和B混合物经过硅胶柱层析,以乙酸乙酯和醋酸混合物为洗脱剂,然后从洗脱物中分离出对映异构体A的乙酸盐,或用碱处理乙酸盐,或进一步用药物可接受的酸处理得到的对映异构体A。