A Visible‐Light‐Induced Strategy for C(sp ³ )─H Heteroarylation of Lactones With Quinoxalin‐2(1 H )‐Ones via Radical Processes in Water

A visible‐light‐induced C(sp ² )─C(sp ³ ) bond construction of quinoxalin‐2(1 H )‐one derivatives utilizing lactones/esters, ethers, and ketones as alkyl radical precursors was developed. Mechanistic studies provide evidence for the involvement of radical species under the visible‐light‐driven H ₂ O ₂ /KHSO ₄ reaction conditions. The reaction proceeds in water at room temperature, providing a mild and operationally simple approach to alkylated quinoxalin‐2(1 H )‐one derivatives.