A process for preparation of enantiomerically pure polysubstituted 1,4-dihydropyridines
申请人:BOEHRINGER MANNHEIM ITALIA S.P.A.
公开号:EP0383320A1
公开(公告)日:1990-08-22
A process for the optical resolution of racemic 1,4-dihydropyridines, containing isothioureido groups. Salification of racemic isothioureas with optically active acids produces diasteroisomeric mixtures of isothiouronium salts, that, using conventional techniques, are separated in the individual components to give optically pure isothioureides of 1,4-dihydropyridines and salts thereof with conventional acids. Said optically pure 1,4-dihydropyridines can then be subjected to desulphuration and to different transformations to give other enantiomerically pure and therapeutically useful 1,4-dihydropyridines.
一种对含有异硫脲基的外消旋 1,4-二氢吡啶进行光学分解的工艺。用光学活性酸盐化外消旋异硫脲,可产生异硫脲鎓盐的二异构体混合物,用常规技术分离各组分,可得到光学纯度为 1,4-二氢吡啶的异硫脲及其与常规酸的盐。上述光学纯度的 1,4-二氢吡啶可以进行脱硫和不同的转化,从而得到其他对映体纯度和治疗用途的 1,4-二氢吡啶。