The present invention relates to a process for the preparation of a compound of formula (I) or a sodium salt thereof ##STR1## wherein HET is 7-chloroquinolin-2-yl or 6,7-difluoroquinolin-2-yl, which comprises: reacting the dilithium dianion of 1-(mercaptomethyl)cyclopropaneacetic acid with a compound of formula (II) ##STR2## wherein HET is as defined above and L is arylsulfonyl or alkylsulfonyl. The invention further provides the dicyclohexylamine salt of a compound of formula (I).
本发明涉及一种制备式(I)化合物或其钠盐的方法,其中HET为
7-氯喹啉-2-基或
6,7-二氟喹啉-2-基,包括以下步骤:将1-(巯基甲基)
环丙基乙酸的二
锂二阴离子与式(II)化合物反应,其中HET如上定义,L为芳基磺酰基或烷基磺酰基。本发明还提供式(I)化合物的二环己基胺盐。