A General Preparation of Pyridines and Pyridones via the Annulation of Ketones and Esters
摘要:
A general preparation of pyridines 4a-f from stabilized ketones 3a-c and aryl ketones 3d-f is described. The annulation of stabilized esters 3g,h gives access to the corresponding 2-pyridones 4g,h. The annulation reactions proceed in fair to excellent yields (46-87%) with vinamidinium hexafluorophosphate salts 2a-d containing electron-withdrawing groups at the beta -positisn. The mechanism of the reaction was investigated by NMR and proceeds through the formation of a dienaminone intermediate.
A General Preparation of Pyridines and Pyridones via the Annulation of Ketones and Esters
作者:Jean-François Marcoux、Félix-Antoine Marcotte、Jimmy Wu、Peter G. Dormer、Ian W. Davies、David Hughes、Paul J. Reider
DOI:10.1021/jo0155198
日期:2001.6.1
A general preparation of pyridines 4a-f from stabilized ketones 3a-c and aryl ketones 3d-f is described. The annulation of stabilized esters 3g,h gives access to the corresponding 2-pyridones 4g,h. The annulation reactions proceed in fair to excellent yields (46-87%) with vinamidinium hexafluorophosphate salts 2a-d containing electron-withdrawing groups at the beta -positisn. The mechanism of the reaction was investigated by NMR and proceeds through the formation of a dienaminone intermediate.