α-Diazomalonates of ()-4-phenylthio-2-buten-1-ol homologues (2) stereoselectively provided γ-alkyl-α-ethoxycarbonyl-α-phenylthio-β-vinylbutyrolactones (1) by the [2.3]sigmatropic rearrangement of cyclic sulfonium ylides (3) intramolecularly generated therefrom with rhodium acetate.
()-4-苯
硫基-
2-丁烯-1-醇同系物(2)的α-重氮
丙二酸酯通过[2.3]σ的重排重排选择性立体地提供了γ-烷基-α-乙氧基羰基-α-苯
硫基-β-
乙烯基丁内酯(1)。用
乙酸铑从其分子内产生的环状
磺酸盐(3)。