Photocatalytic Consecutive Photoinduced Electron Transfer-Enabled C(sp3)–H Pyridylation of Dihydroquinoxalin-2-ones

A photocatalytic decyanative C(sp3)–H pyridination of dihydroquinoxalin-2-ones with 4-cyanopyridines was developed by utilizing 4CzIPN as the photocatalyst. Mechanism studies show that this organophotocatalytic direct C(sp3)–H pyridination undergoes a radical–radical cross-coupling pathway promoted by consecutive photoinduced electron transfer.