title: p-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition.
abstract: One-pot and efficient protocol for preparation of some potent pharmaceutically valuable coumarin derivatives under solvent-free condition via direct coupling using biologically nontoxic organocatalyst, calix[4]arene tetrasulfonic acid (CSA), was introduced. Calix[4]arene sulfonic acid has been incorporated lately as a magnificent and recyclable organocatalyst for the synthesis of some organic compounds. Nontoxicity, solvent-free conditions, good-to-excellent yields for pharmaceutically significant structures, and especially ease of catalyst recovery make this procedure valuable and environmentally benign.
authors.affiliation: Cellular and Molecular Biology Research Center (CMBRC), Health Research Institute, Babol University of Medical Sciences, Babol 47176 41367, Iran.
authors.forename: Hamed
authors.initials: H
authors.lastname: Tashakkorian
authors.affiliation: Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416 95447, Iran.
authors.forename: Moslem Mansour
authors.initials: MM
authors.lastname: Lakouraj
authors.affiliation: Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416 95447, Iran.
authors.forename: Mona
authors.initials: M
authors.lastname: Rouhi