K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>/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 N-unprotected enaminoesters and enaminones that gave 1H-pyrrol-2(3H)-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.
MOON M. W., J. ORG. CHEM. <JOCE-AH>, 1977, 42, NO 13, 2219-2223