Photo(Multicomponent) Reaction of Quinoxalin‐2(1H)‐ones with CBrCl3 and Styrenes by Mes‐Acr‐MeClO4.

In this study, we explored the use of Mes‐Acr‐MeClO4 as a visible light photocatalyst for multicomponent reactions involving quinoxalin‐2(<italic>1</italic>H)‐ones with CBrCl3 and styrene. The method showcases regioselective functionalization of quinoxalin‐2(<italic>1</italic>H)‐ones in a three‐component system, forming two C─C bonds in one pot. Mechanistic investigations suggest a radical‐mediated pathway, initiated by the photoexcitation of Mes‐Acr‐MeClO4, followed by halogen atom abstraction from CBrCl3. This approach provides a versatile and sustainable route for quinoxalin‐2(<italic>1</italic>H)‐one functionalization, with Mes‐Acr‐MeClO4 effectively facilitating the photocatalyzed multicomponent reaction under mild conditions and visible light irradiation, yielding high selectivity and efficiency. [ABSTRACT FROM AUTHOR]