Photochemical substitution of olefins and aromatic compounds with difluoromethyl radicals bearing ester and phosphonate groups
作者:Satoru Murakami、Hideki Ishii、Toshiki Tajima、Toshio Fuchigami
DOI:10.1016/j.tet.2005.12.057
日期:2006.4
transfer at an early stage followed by elimination of phenylselenol from the adducts once formed to provide the unsaturated difluoromethylene adducts selectively. This novel photochemical method was successfully extended to aromatic and heteroaromatic substitutions to provide the corresponding α-aryl-α,α-difluoroacetates and α-aryl-α,α-difluoromethylphosphonates in good to moderate yields.
在2,4,6-三甲基吡啶和二苯基二硒化物的存在下,成功地进行了光生的带有酯基和膦酸酯基团的二氟甲基基团对环状和无环乙烯基醚的高效选择性取代,从而选择性地提供了相应的区域选择性不饱和二氟亚甲基加合物。该反应涉及在早期阶段进行苯基硒烯基转移,随后一旦形成就选择性地提供不饱和二氟亚甲基加合物而从加合物中消除苯基硒醇。这种新颖的光化学方法已成功地扩展到芳族和杂芳族取代,从而以良好至中等的产率提供了相应的α-芳基-α,α-二氟乙酸酯和α-芳基-α,α-二氟甲基膦酸酯。