Author/Authors :
Niknam، Khodabakhsh نويسنده , , Sajadi، Seyed Ahmad نويسنده Department of Chemistry, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran , , Hosseini، Roghayeh نويسنده Department of Chemistry, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran. , , Baghernejad، Mojtaba نويسنده Young Researchers and Elite Club, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran ,
Abstract :
Silica-bonded n-propyldiethylenetriamine sulfamic acid (SBPDSA) was found as an efficient solid acid for the synthesis of coumarins. Coumarin derivatives were obtained via the Pechmann condensation reaction of phenols and B-keto-esters at 80 oC under solvent-free conditions. Also, biscoumarins were obtained via the condensation of aldehydes and 4-hydroxycoumarin in water at reflux conditions. The heterogeneous solid acid showed much the same efficiency when used in consecutive reaction runs.
