Highly Efficient and Expedient Synthesis of 5-Hydroxy-1<i>H</i>-pyrrol-2-(5<i>H</i>)-ones from FeCl<sub>3</sub>-Catalyzed Tandem Intramolecular Enaminic Addition of Tertiary Enamides to Ketones and 1,3-Hydroxy Rearrangement

Catalyzed by FeCl<sub>3</sub> under very mild conditions, tertiary enamides underwent a highly efficient intramolecular enaminic addition reaction to the ketonic carbonyls followed by 1,3-hydroxy rearrangement to produce 5-hydroxy-1<i>H</i>-pyrrol-2(5<i>H</i>)-ones in excellent yields.