An organophotoredox
1,6-radical addition of 3,4-dihidroquinoxalin-2-ones
topara-quinone methides catalyzed by Fukuzumi’s
photocatalyst is described under the irradiation of a HP Single LED
(455 nm). The corresponding 1,1-diaryl compounds bearing a dihydroquinoxalin-2-one
moiety (20 examples) are obtained with good to excellent yields under
mild reaction conditions. Several experiments have been carried out
in order to propose a reaction mechanism.