Synthesis of new tripodal Hantzsch 1,4-dihydropyridines under solvent-free condition and their conversion to the corresponding tripodal pyridines.

A mixture of β-ketoester and tri-aldehydes in the presence of ammonium fluoride was converted to their corresponding tripodal 1,4-dihydropyridines under solvent-free condition with good yields. The obtained tripodal 1,4-dihydropyridines were also aromatized with oxone(®)/NaNO(2)/wet SiO(2) system under mild and heterogeneous conditions quantitatively.