Photochemical generation of difluoromethyl radicals having various functional groups and their highly regioselective addition to olefins and aromatic substitution
作者:Hirokatsu Nagura、Satoru Murakami、Toshio Fuchigami
DOI:10.1016/j.tet.2007.07.081
日期:2007.10
Difluoromethyl radicals bearing ester, phosphonate, nitrile, cyclic carbonate, and carbamate groups were generated by the photoinitiated S–CF2 bond cleavage of electrosynthesized α,α-difluorosulfides, and their addition to olefins and aromatic substitution were successfully carried out to provide the regioselective adducts and substitution products in moderate yields. The yields of substitution products
电合成的α,α-二氟硫化物通过光引发的S–CF 2键裂解生成带有酯基,膦酸酯基,腈基,环状碳酸酯基和氨基甲酸酯基团的二氟甲基自由基,并成功地将其添加到烯烃中并进行了芳族取代,从而提供了区域选择性加合物和替代产品的收率中等。通过加入二苯基二硒化物和2,4,6-三甲基吡啶,取代产物的产率提高。