1Medicinal Plants Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. IRAN
2Department of Chemistry, Tehran-North Branch, Islamic Azad University, Zafar St, Tehran, I.R. IRAN
3Department of Medicinal Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences, Tehran, I.R. IRAN
The surface of SBA-15 was modified by diphenylphosphine; then, it was treated with butane sultone and sulfuric acid to obtain Brønsted acid HO3S-phosphonium based ionic liquid functionalized SBA-15 with HSO4- as a counteranion. It efficiently catalyzed synthesis of pyrano[3,2-c]chromenone derivatives through the reaction of 4-hydroxycoumarin and chalcones at 60 °C in water/ethanol. Good yields, mild reaction conditions, and user-friendly procedure are advantages of this method.Also, the catalyst could be easily separated and reused five times without significant reduction of activity.