Cu@g-C ₃ N ₄ heterojunction-catalyzed visible-light-driven direct C–H alkylation of heterocycles

heterojunctions as recyclable photocatalysts and alkylhydrazines as alkylating reagents was reported. This heterogeneous photocatalytic system can operate under additive-free and mild conditions to deliver an assortment of alkylated heterocycles in moderate to excellent yields, featuring high efficiency, broad substrate scope, easy scalability, excellent functional group tolerance, and exceptional catalyst recyclability.