Mijin, Dusan Z; Antonovic, Dusan G; Misic-Vukovic, Milica M, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1994, vol. 33, p. 309 - 311
Mijin, Dusan Z; Antonovic, Dusan G; Misic-Vukovic, Milica M, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1994, vol. 33, p. 309 - 311
作者:Mijin, Dusan Z、Antonovic, Dusan G、Misic-Vukovic, Milica M
DOI:——
日期:——
Kinetics and mechanism of the condensation reaction of symmetrical and unsymmetrical 1,3-diketones with cyanoacetamide in the synthesis of 4,6-disubstituted-3-cyano-2-pyridones
The rate constants for the condensation. reaction of cyanoacetamide with pentane-2,4-dione, 5-methylhexane-2,4-dione and 5,5-dimethylhexane-2,4-dione catalysed by piperidine were determined under a variety of experimental conditions. A UV spectrophotometric method for rate measurements was developed and the structures of the products were elucidated by means of a spectroscopic study. On the basis of the obtained rate constants, activation parameters and the evidence on the structure of synthesized unsymmetrical 4,6-disubstituted-3-cyano-2-pyridones a possible reaction scheme was suggested. It was thus possible to explain the selectivity of the reaction and the position of substituents in the pyridones obtained.
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).
Radojkovi-Velikovi M., Valenti N. V., Mii-Vukovi M., J. Serb. Chem. Soc, 59 (1994) N 12, S 921-927
作者:Radojkovi-Velikovi M., Valenti N. V., Mii-Vukovi M.
DOI:——
日期:——
Mijin, Dušanž; Mišić-Vuković, Milica M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1998, vol. 37, # 10, p. 988 - 994