Photocatalyst-Free Visible Light-Induced C(sp)-H Arylation of Quinoxalin-2(1H)-ones and Coumarins.

Herein, we describe a visible light-induced C(sp)-H arylation method for quinoxalin-2(1H)-ones and coumarins using iodonium ylides without the need for external photocatalysts. The protocol demonstrates a broad substrate scope, enabling the arylation of diverse heterocycles through a simple and mild procedure. Furthermore, the photochemical reaction showcases its applicability in the efficient synthesis of biologically active molecules.