Photoredox‐Catalyzed Three‐Component Difluoroalkylation of Quinoxalin‐2(1H)‐ones with Unactivated Vinylarenes and [Ph3PCF2H]+Br

An efficient synthesis of a variety of 3‐difluoroalkyl quinoxalin‐2(1H)‐ones via a photoredox‐catalyzed three‐component reaction between quinoxalin‐2(1H)‐ones, vinylarenes, with inexpensive and easily accessible difluoromethyltriphenyl phosphonium bromide salt as the difluoromethylated reagent is described. This protocol shows excellent reactivity, providing a wide range of difluoroalkyl‐substituted quinoxalin‐2(1H)‐ones in moderate to excellent yields under mild conditions. A difluoroalkyl radical intermediate was involved in this three‐component transformation. A photocatalytic oxidative protocol for the synthesis of 3‐difluoroalkyl quinoxalin‐2(1H)‐ones derivatives was developed via the difluoroalkylation of quinoxalin‐2(1H)‐ones with unactivated vinylarenes and [Ph3PCF2H]+Br−.