An efficient method for the one-pot, three-component synthesis of 3,4-dihydropyrano[c]chromenes catalyzed by nano Al2O3

Abstract

Nano Al2O3 efficiently catalyzed the one-pot, three-component reaction of 4-hydroxycoumarin, aromatic aldehydes and malononitrile to yield 3,4-dihydropyrano[c]chromene derivatives in high yields. The features of this procedure are mild, reaction conditions, short reaction time and operational simplicity.