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International Journal of Medicinal Chemistry
Volume 2015, Article ID 738202, 8 pages
http://dx.doi.org/10.1155/2015/738202
Research Article

p-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition

1Cellular and Molecular Biology Research Center (CMBRC), Health Research Institute, Babol University of Medical Sciences, Babol 47176 41367, Iran
2Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416 95447, Iran

Received 12 October 2015; Accepted 26 November 2015

Academic Editor: Benedetto Natalini

Copyright © 2015 Hamed Tashakkorian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.