Intermediates and a stepwise process for the conversion of D-methionine or certain of its derivatives to optically active compounds of the formula
wherein R is (C₁-C₃)alkyl, phenyl or tolyl. The latter compounds are in turn useful as an intermediate in the preparation of penem antibiotic 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid and corresponding pharmaceutically acceptable salts and esters.
将
D-蛋氨酸或其某些衍
生物转化为光学活性式化合物的中间体和分步工艺
其中 R 是 (C₁-C₃)烷基、苯基或
甲苯基。后一种化合物又可作为制备青霉烯抗生素 5R,6S-6-(1R-羟乙基)-2-(1R-氧代-3S-
硫巯基)-2-青霉烯-3-
羧酸及相应的药学上可接受的盐和酯的中间体。