Aromatization of hantzsch 1,4-dihydropyridines with Al(NO _3)39H_2O and/or Fe(NO_3)39H_2O in the presence of silica sulfuric acid under mild and heterogeneous conditions

摘要

A simple and convenient method for the aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridines is achieved via combination of aluminum or ferric nitrates and silica sulfuric acid as environmentally friendly and novel oxidizing media. This oxidation was carried out in dichloromethane under heterogeneous conditions with good to excellent yields.