The invention provides a new process for the preparation of solifenacin or a pharmaceutically acceptable acid addition salt thereof, comprising reacting (R)-quinuclidin-3-yl phenethylcarbamate with benzaldehyde in the presence of an acid to obtain a diasteroisomeric mixture (S,R)—((R)-quinuclidin-3-yl) 1-phenyl-3,4-dihydroisoquinoline-2(1H)-carboxylate of formula (IV) which can be resolved and the solifenacin or a pharmaceutically acceptable acid addition salt thereof recovered. The invention also provides the new key intermediate (R)-quinuclidin-3-yl phenethylcarbamate involved in the process. Further the invention provides a method for the transformation of (R)—((R)-quinuclidin-3-yl) 1-phenyl-3,4-dihydroisoquinoline-2(1H)-carboxylate into a diasteroisomeric mixture (S,R)—((R)-quinuclidin-3-yl) 1-phenyl-3,4-dihydroisoquinoline-2(1H)-carboxylate.
该发明提供了一种制备索利那辛或其药用可接受的酸盐的新工艺,包括在酸的存在下将(R)-喹诺
啡啶-3-基
苯乙基氨基甲酸酯与
苯甲醛反应,以获得一个立体异构混合物(S,R)-((R)-喹诺
啡啶-3-基)
1-苯基-3,4-二氢异喹啉-2(1H)-
羧酸酯的公式(IV),该混合物可以被分离,并可回收索利那辛或其药用可接受的酸盐。该发明还提供了参与该工艺的新关键中间体(R)-喹诺
啡啶-3-基
苯乙基氨基甲酸酯。此外,该发明提供了一种将(R)-((R)-喹诺
啡啶-3-基)
1-苯基-3,4-二氢异喹啉-2(1H)-
羧酸酯转化为一个立体异构混合物(S,R)-((R)-喹诺
啡啶-3-基)
1-苯基-3,4-二氢异喹啉-2(1H)-
羧酸酯的方法。