New Crown Ether-Based Ionic Liquids as a Green and Versatile Organocatalyst for Three-Component Synthesis of 1,5-Dihydropyrano[2,3- c]chromene Derivatives
3-c]chromene derivatives has been reported by three-component reaction of aromatic aldehydes, malononitrile, and 3-hydroxycoumarin in the presence of a series of novel crown ether-based ionic liquids (CE-based ILs) in H2O/EtOH (1:1), under the reflux conditions. The novel CE-based ILs have been synthesized by 18-crown-6 or dibenzo 18-crown-6 chelated with sodium benzenesulfinate derivatives and used as