Electroreductive Defluorination of Trifluoromethyl Ketones and Trifluoroacetic Acid Derivatives
作者:Kenji Uneyama、Go Mizutani、Kazushige Maeda、Tsuyoshi Kato
DOI:10.1021/jo990571d
日期:1999.9.1
Difluoroenol silyl ethers 5 and 6, difluoroketene silyl (O,O-, O,S-, and O,N-) acetals 9 and 21, and 2,2-difluoro-2-trimethylsilylacetates 10 were prepared by electroreductive defluorination of trifluoromethyl ketones and trifluoroacetic acid derivatives in an MeCN-TBAB-chlorotrialkylsilane system using a carbon rod as an anode and a lead plate as a cathode. TBAF- or KF-CuI-promoted alpha-alkylation
二氟乙烯甲硅烷基醚5和6,二氟乙烯甲硅烷基(O,O-,O,S-和O,N-)乙缩醛9和21和2,2-二氟-2-三甲基甲硅烷基乙酸酯10是通过三氟甲基酮的电还原脱氟制备的MeCN-TBAB-氯三烷基硅烷体系中的三氟乙酸衍生物,其中碳棒为阳极,铅板为阴极。TBAF或KF-CuI促进了用亲电子试剂(如醛,酮,亚胺,酰卤和烷基卤化物)促成的10的α-烷基化反应,从而以良好的收率很好地提供了α-烷基化的α,α-二氟乙酸酯。