Phenyl trifluorovinyl sulfide: a radical acceptor for preparation of gem-difluoromethylene compounds
作者:Takashi Okano、Masayuki Chokai、Makiko Hiraishi、Michito Yoshizawa、Takahiro Kusukawa、Makoto Fujita
DOI:10.1016/j.tet.2004.03.020
日期:2004.4
trifluorovinyl sulfide was prepared from the reaction of trifluorovinyllithium and S-phenyl benzenethiosulfonate. The fluorinated olefin showed reactivity with alkyl radicals generated from halogen-abstraction from alkyl halides. Reactions with alkyl halides required tris(trimethylsilyl)silane as a chain transfer reagent to improve selectivity of the products. Initiation of radical reaction was effected
由三氟乙烯基锂与S-苯基苯硫代磺酸盐的反应制备苯基三氟乙烯基硫。氟化烯烃显示出与卤代烷卤化物生成的烷基自由基的反应性。与烷基卤化物的反应需要使用三(三甲基甲硅烷基)硅烷作为链转移剂,以提高产物的选择性。自由基反应的引发是通过AIBN的热分解来实现的。硫醚产物的氧化得到相应的亚砜,其通过Pummerer反应被依次转化为α,α-二氟链烷羧酸硫醇酯。