Abstract
An effective method for synthesis of substituted 1,4-dihydropyridines and polyhydroquinoline derivatives by Hantzsch reaction using poly(ionic liquid)-based nanozeolite (NZ@PIL-COOH) catalyst under simple conditions is described. The new solid acid catalyst was prepared by polymerization of 3-carboxymethyl-1-vinylimidazolium in presence of modified nanozeolite, and characterized by Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, and transmission electron microscopy (TEM). The resulting heterogeneous catalyst displayed high catalytic performance under mild reaction condition in short reaction time. The catalyst was recycled eight times without any loss in reactivity or yield.
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