title: Ultrasonic Assisted Synthesis of Chromenes Catalyzed by Sodium Carbonate in Aqueous Media.
abstract: A simple, efficient, and environmentally benign procedure for the synthesis of 2-amino-4H-chromene ring has been achieved by the three-component reaction of an aromatic aldehyde, malononitrile and diverse enolizable C-H activated compound under ultrasound irradiation using sodium carbonate as a catalyst in aqueous media. Sodium carbonate as a natural salt, being available as an inexpensive catalyst combined with ultrasound method promoted this protocol in comparison to other methods and catalysts.
authors.affiliation: Chemistry Department, Faculty of Sciences, Shahid Rajaee Teacher Training University, P.O. Box 16785- 163, Tehran, Iran. sabbaghan@srttu.edu.
authors.forename: Maryam
authors.initials: M
authors.lastname: Sabbaghan
authors.forename: Pegah
authors.initials: P
authors.lastname: Sofalgar
mesh_terms: D001578:Benzopyrans / Q000138:chemical synthesis*; D002254:Carbonates / Q000737:chemistry*; D002384:Catalysis; D014465:Ultrasonics; D014867:Water / Q000737:chemistry*
chemical_list: D001578:Benzopyrans; D002254:Carbonates; D014867:Water; C005686:sodium carbonate