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A simple one pot synthesis has been developed for the synthesis 1,4-dihydropyridine using an efficient and reusable silica supported MgO solid catalyst by condensation of dimedone, ethyl acetoacetate, aldehyde and ammonium acetate in methanol as a solvent at room temperature. The reactions could be carried out under mild reaction conditions with very good yield of polyhydroquinoline, up to 92%. This catalyst could be recycled very easily, which makes this methodology environmentally benign.
Recently, novel materials like gas-sensing metal oxides, mixed metal oxides, and modified mixed metal oxides have attracted great attention owing to their key roles in monitoring e...