stereoselectively to β-phenylthio-γ-butyrolactones. Oxidation to sulphoxides and thermolysis provides a general synthesis of β- and γ-substituted Δαβ-butenolides. Treatment of 5,5-dimethyl-4-oxo-3-(phenylthio)-hexanoic acid with NaBH4 gives a single γ-lactone whose PhS and But groups are shown to be cis by an X-ray crystal structure determination.
α-(苯
硫基)-酮或-酯与
碘乙酸根阴离子的烷基化得到1,4-二羰基化合物,其立体选择性地还原为β-苯
硫基-
γ-丁内酯。氧化成亚砜和热解提供的β-和一般的合成γ取代的Δ αβ -butenolides。的5,5-二甲基-4-氧代-3-(苯
硫基) -
己酸用NaBH治疗4给出了一个单一的γ -内酯,其PHS和BU吨基团被示出为顺式由X射线晶体结构测定。