Diastereoselectivity in the preparation of 4-phenylthio-4-butanolide derivatives by the Pummerer rearrangement of 4-phenylsulfinylbutanoic acid derivatives was clarified. The reaction of 3-alkyl-4-phenylsulfinylbutanoic acid with acetic anhydride resulted in the predominant formation of trans-3-alkyl-4-phenylthio-4-butanolide. Lactonization of 2,3-dialkyl-4-phenylsulfinylbutanoic acid gave (2RS,3RS
阐明了通过 4-
苯基亚磺酰基
丁酸衍
生物的普默勒重排制备 4-
苯硫基-4
-丁内酯衍
生物的非对映选择性。3-烷基-4-
苯基亚磺酰基
丁酸与
乙酸酐的反应导致主要形成反式-3-烷基-4-
苯硫基-4
-丁内酯。2,3-二烷基-4-
苯基亚磺酰基
丁酸的内
酯化主要得到(2RS,3RS,4SR)-2,3-二烷基-4-
苯硫基-4
-丁内酯。