Synthesis and characterization of mesoporous silica green catalyst,functionalized with nicotinic acid and its use for synthesis of pyran heterocyclic compounds

A simple and convenient method has been used to prepare an SBA-Nicotinic acid (SBA-Niacin) composite on SBA-15 mesoporous silica as support. The composite was easily prepared by nucleophilic substitution of SBA-propylchloride with nicotinic acid. The structural properties of SBA-Niacin were systematically investigated by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission and scanning electron microscopy, X-ray diffraction spectroscopy, thermal gravimetric analysis and Brunauer Emmett Teller. The catalytic activity of this nanocomposite was successfully tested through the one-pot synthesis of pyran annulated heterocyclic compounds via three-component couplings of aromatic aldehydes, malononitrile and β-diketone (dimedone and 4-hydroxy-6-methyl-2-pyrone) under solvent-free conditions.