Abstract
Copper/Schiff-base complex immobilized on KIT-6-NH2 magnetic nanoparticles as a novel heterogeneous catalyst was synthesized and the structure and morphology of nanomagnetic catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), Xray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), zeta potential, Magnetization curve (VSM) and thermal gravimetric analysis (TGA). The new synthesized catalyst was found to be an efficient nanocatalyst for the synthesis new derivatives of pyrazolyl, bis and tris dihydropyridines via one-pot three-component condensation reaction of various aldehydes, dimedone and NH4OAc in aqeous media. The products were identified by 1H NMR, FT-IR and CHNS analysis. In some cases, 13C NMR were taken. This new procedure has the notable advantages such as operational simplicity, excellent yields, short reaction time, easy work-up, eco-friendly and nontoxic catalyst. Also the catalyst can be easily recovered by an external magnetic field and reused for six consecutive reaction cycles without significant loss of activity.
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