dtp/sio2:an efficient and reusable heterogeneous catalyst for synthesis of dihydropyrano[3,2-c]chromene-3-carbonitrile derivatives

An efficient and convenient method has been developed for the synthesis of 2-amino-5-oxo-4-phenyl-4, 5-dihydropyrano[3,2-c]chromene-3-carbonitrile derivatives from one-pot multicomponent reaction between 4-hydroxy-2h-chromen-2-one, aromatic aldehydes and malononitrile catalyzed by dtp/sio2 as an efficient and reusable heterogeneous catalyst. the current method provides adavtages over reported method viz simple operational procedure, easy isolation and recyclability of the catalyst, environmental benign, reduced reaction time and superior yield.