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چکیده
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Pyridine-functionalized MCM-41 nanoporous silica has been explored as an efficient and recyclable catalyst to effect the three-component condensation reactions between aromatic aldehydes and malononitrile with α-Naphthol, β-Naphthol, or 4-hydroxycoumarin, under solvent-free conditions for the synthesis of 2-amino-4H-chromenes and 3,4-dihydropyrano[c]chromenes, respectively. High surface area and recyclability of the Pyridine-functionalized MCM-41 mesoporous silica, solvent-free conditions, low reaction times and high yields products are the main advantages of this The catalyst has been characterized by FT-IR and XRD method
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