title: Solvent-free synthesis of dihydropyrano[3,2-c]chromene and biscoumarin derivatives using magnesium oxide nanoparticles as a recyclable catalyst.
abstract: In these research, an efficient one pot approach for the synthesis of dihydropyrano[3,2-c]chromenes and biscoumarins as important heterocyclic compounds with pharmacological and biological properties have been prepared using nanocrystalline magnesium oxide. Magnesium oxide nanoparticles were significantly catalyzed three-component reaction of aldehydes, ethyl cyanoacetate and 4-hydroxycoumarin in high yields and short reaction times under solvent-free conditions. Nano magnesium oxide as an efficient, available and cheap heterogeneous nanoparticles were used for several times in the synthesis of dihydropyrano [3,2-c]chromenes and biscoumarins.
authors.forename: Javad
authors.initials: J
authors.lastname: Safaei-Ghomi
authors.forename: Fahime
authors.initials: F
authors.lastname: Eshteghal
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Ghasemzadeh