Reduction of 1-chloro-3-phenylsulfonyl-2-propanone with baker's yeast, followed by epoxidation and alkylation with Grignard reagents, yields enantiomerically pure (2S)-2-phenylsulfonyl-2-alkanols, which are converted into (4S)-2-alken-4-olides in 100% e. e.
用面包酵母还原1-
氯-3-苯磺酰基-2-
丙酮,随后进行环氧化和与格里尼亚试剂的烷基化,得到对映体纯的(2S)-2-苯磺酰基-2-烷醇,这些烷醇进一步转化为(4S)-2-烯-4-内酯,具有100%的对映体过量。