Copper-catalyzed olefinic C-H difluoroacetylation of enamides

摘要

Copper-catalyzed olefinic difluoroacetylation of enamides via direct C-H bond functionalization using BrCF_2CO_2Et is reported for the first time. It constitutes an efficient radical-free method for the regioselective synthesis of β-difluoroester substituted enamides which exhibits broad substrate scope, and thus demonstrates its potent application in a late stage fluorination strategy.