Rezvan Ghanavatian - Department of Chemistry,Omidiyeh Branch, Islamic Azad University, Omidiyeh , Iran
Fatemeh Ahmadzadeh
Hossein Anaraki-Ardakani - Department of Chemistry , Mahshahr Branch , Islamic Azad University , Mahshahr,
Mojtaba Rahmaninejad

Three-component reaction between 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one,aromatic aldehydes and cyclic1,3-diketone catalyzed by nanosilica sulfuric acid in solvent-free conditions provided a simple and efficient one-pot route for the synthesis of tetrahydro-chromeno[4,3-b]chromene-6,8- dione and tetrahydro-pyrano[4,3-b]chromene-1,9-dione derivatives in excellent yields

4-Hydroxycoumarin, aromatic aldehydes, nanosilica sulfuric acid, cyclic1,3-diketone,solvent- free