Synthese et reactivite des perfluoroalkyl-3 alkylthio-3 propenoates d'ethyle: thiophenes et β-thioxoesters perfluoroalkyles
作者:A. Chauvin、J. Greiner、R. Pastor、A. Cambon
DOI:10.1016/s0040-4020(01)87467-6
日期:1986.1
reactivity of the adducts reported. The mono-adducts Z and E formed by the action of thiols with 1 were unambiguously identified by 19F-NMR. In addition to the expected alkenes Z and E, the reaction of 1 with ethyl mercaptoacetate led to ethyl 2-F-alkyl-4-hydroxy-3-thiophenecarboxylate 7. The cyclisation of ethyl 3-F-alkyl-3-(methoxycarbonylmethylthio) propenoate Z in basic medium afforded methyl 5-F-alkyl-
研究了硫醇与全氟烷基化的α,β-不饱和化合物(3-F-烷基丙酸乙酯1和3-F-烷基丙酸乙酯2)的作用,并报道了加合物的反应性。单加成物Ž和Ë通过与硫醇的作用形成1中明确地识别出由19 F-NMR。除了预期的烯烃Z和E,1与巯基乙酸乙酯的反应还导致2-F-烷基-4-羟基-3-噻吩羧酸乙酯7。3-F-烷基-3-(甲氧基羰基甲硫基)乙基丙烯酸酯Z在碱性介质中的环化,得到5-F-烷基-3-羟基-2-噻吩基-羧酸甲酯8,而在类似条件下,乙基3-F-烷基- 3-(甲氧基羰基乙硫基)丙酸酯生成3-F-烷基-3-巯基丙酸乙酯,作为在全氟烷基化链的α-碳上带有硫原子的β-硫代氧酸酯的第一个实例。