K₂S₂O₈/TEMPO-Induced Cascade Oxidative Cyclization/1,2-Migration of Electron-Deficient Groups: Strategy for the Construction of 1<i>H</i>‑Pyrrol-2(3<i>H</i>)‑ones

A K₂S₂O₈/TEMPO-induced oxidative cyclization of <i>N</i>-unprotected enaminoesters and enaminones that gave 1<i>H</i>-pyrrol-2­(3<i>H</i>)-ones in good yields with broad functional group compatibility is reported. This method provides easy access to 1,2-carbon migration of ester or acyl group under transition-metal-free conditions