Annulation of ketones with vinamidinium hexafluorophosphate salts: an efficient preparation of trisubstituted pyridines.


alpha-Aryl ketones react with vinamidinium hexafluorophosphate salts to give access to the corresponding 3-arylpyridines. The annulation reactions proceed in good to excellent yields with vinamidinium salts containing electron-withdrawing groups at the beta-position (R(2)). The reaction was applied to the preparation of the COX-2 specific inhibitor 5-chloro… (More)


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