Synthesis of butenolides from α-(phenylthio)-ketones and -esters: crystal structure of an intermediate β-phenylthio-γ-lacton
作者:Peter Brownbridge、Ernst Egert、Paul G. Hunt、Olga Kennard、Stuart Warren
DOI:10.1039/p19810002751
日期:——
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。