Dihydropyridine-3, 5-dicarboxylic acid ester derivatives
    5.
    发明授权
    Dihydropyridine-3, 5-dicarboxylic acid ester derivatives 失效
    二氢吡啶-3,5-二羧酸酯衍生物

    公开(公告)号:US5616715A

    公开(公告)日:1997-04-01

    申请号:US491793

    申请日:1995-06-19

    摘要: 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.

    摘要翻译: 提供了一种制备非对映异构体A或2,6-二甲基-4-(3-硝基苯基)-1,4-二氢吡啶-3,5-二羧酸的3-(1-苄基吡咯烷-3-基) - 基)酯5-甲酯,其包括使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-3-基)酯将5-甲酯与硅胶作为载体和乙酸乙酯与乙酸的混合物作为洗脱剂进行柱色谱分离,然后将非对映异构体A的乙酸酯与洗脱液分离,或用 碱,或用药学上可接受的酸进一步处理所得的非对映异构体A.