Regioselective Synthesis of 2(1<i>H</i>)-Pyridinones from β-Aminoenones and Malononitrile. Reaction Mechanism
作者:Angel Alberola、Luis A. Calvo、Alfonso González Ortega、M. Carmen Sañudo Ruíz、Pedro Yustos、Santiago García Granda、Esther García-Rodriguez
DOI:10.1021/jo991121o
日期:1999.12.1
The identification of some intermediates of the reactions between beta-aminoenones and malononitrile to give 2(1H)-pyridinones has allowed us to obtain valuable information concerning its mechanism. These reactions begin with a conjugated addition of the nitrile to the enone followed by elimination. The compounds thus obtained cyclize to nonisolable 2H-pyran-2-imine. This afforded 2(1H)-pyridinones by ring opening to unsaturated aminoamides followed by cyclization (Dimroth-type rearrangement).