Visible Light-Induced\nRadical Cascade Functionalization\nof Quinoxalin-2(1<i>H</i>)‑ones: Three-Component\n1,2-Di(hetero)arylation Approach with Styrenes and Thianthrenium Salts

The\nadditive-free visible light-induced three-component 1,2-di(hetero)arylation\nof styrenes was developed using quinoxalin-2(1<i>H</i>)-ones\nand thianthrenium salts. The purple visible light excitable quinoxalin-2(1<i>H</i>)-ones were utilized for the single-electron transfer to\naryl thianthrenium salts, where the generated aryl radical species\nunderwent the addition cascade to styrenes and quinoxalin-2(1<i>H</i>)-ones. The direct aryl radical addition to quinoxalin-2(1<i>H</i>)-ones also led to the formation of a side product, C3-aryl\nquinoxalin-2(1<i>H</i>)-ones, capable of a photoredox process\nto help the formation of 1,2-di(hetero)arylation products.