Recyclable V2O5/g-C3N4Heterojunction-Catalyzed Visible-Light-Promoted C3–H Trifluoromethylation of Quinoxalin-2-(1H)-ones

A visible-light-initiated C–H trifluoromethylation of quinoxalin-2(1H)-ones was established using a Z-scheme V2O5/g-C3N4heterojunction as a recyclable photocatalyst in an inert atmosphere at room temperature under additive-free and mild conditions. A variety of trifluoromethylated quinoxalin-2-(1H)-one derivatives were heterogeneously generated in moderate to high yields, exhibiting good functional group tolerance. Remarkably, the recyclable V2O5/g-C3N4catalyst could be reused five times with a slight loss of catalytic activity.