A Green Approach for Efficient Synthesis of Dihydropyrano[c]chromenediones Using CuI NPs as a Heterogeneous Catalyst under Grinding

A concise and CuI nanoparticles catalyzed synthesis of tetrahydrochromenediones and dihydropyrano[c]chromenediones under solvent-free grinding conditions via three-component condensation reaction of meldrum’s acid, aromatic aldehydes and active methylene compounds including dimedone or 4-hydroxycoumarine was developed. This new method gives the desirable advantages such as simple reaction set-up, very mild reaction conditions, production the desired products in high yields without by products, recyclability of the catalyst and environmentally benign procedure