Synthesis of 1,2,3Triazolo-1,5-aquinoxalin-4(5H)-ones through Photoredox-Catalyzed 3 + 2 Cyclization Reactions with Hypervalent Iodine(III) Reagents

An efficient synthesis of a variety of 1,2,3triazolo-1,5-aquinoxalin-4(5H)-ones via a 3 + 2 cyclization reaction by photoredox catalysis between quinoxalinones and hypervalent iodine(III) reagents is reported. A range of quinoxalinones and hypervalent iodine(III) reagents were tolerated well. This cyclization reaction allows access to structurally diverse 1,2,3triazolo-1,5-aquinoxalin-4(5H)-ones in moderate to good yields.