Journal of Molecular Catalysis A-Chemical, Vol.260, No.1-2, 179-180, 2006
A simple and efficient one-pot synthesis of 1,4-dihydropyridines using heterogeneous catalyst under solvent-free conditions
One-pot condensation of beta-dicarbonyl compounds with aldehydes and ammonium acetate in the presence of HCIO4-SiO2 at 80 degrees C under solvent-free conditions with good to excellent yields. The catalyst is easily prepared, stable, reusable and efficiently used under reaction conditions. (c) 2006 Elsevier B.V. All rights reserved.
Keywords:beta-dicarbonyl compounds;1,4-dihydropyridines;HClO4-SiO2;recyclable heterogeneous catalyst;solvent-free conditions