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An environmentally friendly strategy for the photo-catalyzed three-component reaction between quinoxalin-2(1 H )-ones, vinylarenes, with inexpensive and easily accessible ethyl bromodifluoroacetate/sodium difluoromethanesulfinate is described. This protocol exhibits mild conditions, high efficiency, and excellent functional group tolerance, providing a highly efficient approach for the synthesis of difluorobenzylated quinoxalin-2(1 H )-ones by the formation of two carbon-carbon bonds. A radical mechanism is responsible for this three-component transformation.

Photoredox-catalyzed three-component difluorobenzylation of quinoxalin-2(1 H )-ones with unactivated vinylarenes and BrCF 2 CO 2 Et/HCF 2 CO 2 H