Recyclable VO/g-CN Heterojunction-Catalyzed Visible-Light-Promoted C3-H Trifluoromethylation of Quinoxalin-2-(1)-ones.

A visible-light-initiated C-H trifluoromethylation of quinoxalin-2(1)-ones was established using a Z-scheme VO/g-CN 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)-one derivatives were heterogeneously generated in moderate to high yields, exhibiting good functional group tolerance. Remarkably, the recyclable VO/g-CN catalyst could be reused five times with a slight loss of catalytic activity.