Scope and Limitations in the Regioselective Synthesis of 1,3,5-Trisubstituted Pyrazoles from b-Amino Enones and Hydrazine Derivatives. 13C-Chemical Shift Prediction Rules for 1,3,5-Trisubstituted Pyrazoles
Alberola, Angel; Gonzalez-Ortega, Alfonso; Sadaba, M. Luisa, Journal of the Chemical Society. Perkin transactions I, 1998, # 24, p. 4061 - 4065
作者:Alberola, Angel、Gonzalez-Ortega, Alfonso、Sadaba, M. Luisa、Sanudo, M. Carmen
DOI:——
日期:——
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).
Scope and Limitations in the Regioselective Synthesis of 1,3,5-Trisubstituted Pyrazoles from b-Amino Enones and Hydrazine Derivatives. 13C-Chemical Shift Prediction Rules for 1,3,5-Trisubstituted Pyrazoles
作者:Alfonso González-Ortega、M. Luisa Sádaba、Angel Alberola、Luis Calvo Bleye、M. Carmen Sañudo