Recyclable V₂O₅/g-C₃N₄ Heterojunction-Catalyzed Visible-Light-Promoted C3–H Trifluoromethylation of Quinoxalin-2-(1<i>H</i>)-ones

Abstract

A visible-light-initiated C-H trifluoromethylation of quinoxalin-2(1<i>H</i>)-ones was established using a Z-scheme V₂O₅/g-C₃N₄ heterojunction as a recyclable photocatalyst in an inert atmosphere at room temperature under additive-free and mild conditions. A variety of trifluoromethylated quinoxalin-2-(1<i>H</i>)-one derivatives were heterogeneously generated in moderate to high yields, exhibiting good functional group tolerance. Remarkably, the recyclable V₂O₅/g-C₃N₄ catalyst could be reused five times with a slight loss of catalytic activity.