Visible‐Light‐Promoted Cascade Radical Cyclization: Synthesis of 1,4‐Diketones Containing Chroman‐4‐One Skeletons

Abstract A visible‐light‐induced cascade radical cyclization of aroyl chlorides with 2‐(allyloxy)‐benzaldehyde derivatives has been developed. The method takes advantages of unactivated C=C bonds as the acyl radical acceptors and offers a mild and green approach for the synthesis of 1,4‐diketones bearing biologically important chroman‐4‐one skeletons with moderate to good yields.