Cecl3 Center Dot 7h(2)O/Sio2 As An Efficient And Recyclable Catalyst For The Synthesis Of Dihydropyrano[3,2-B]Chromenediones

Dihydropyrano[3,2-b]chromenedione derivatives were synthesized in moderate-to-high yields in one-pot three-component reaction from the corresponding aromatic aldehydes, kojic acid, and dimedone, in the presence of catalytic amount of CeCl3 center dot 7H(2)O/SiO2 as a nontoxic, reusable, inexpensive, and easily available reagent, under solvent-free conditions.