Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (9): 1542-1545.DOI: 10.1016/S1872-2067(11)60432-4

• Research papers • Previous Articles     Next Articles

A Simple and Environmentally Benign Protocol for Biginelli Reactions Catalyzed by Silica-Bonded S-Sulfonic Acid

Mahmood TAJBAKHSH1,*, Yousef RANJBAR2, Abdolhosein MASUODI2, Samad KHAKSAR3   

  1. 1Chemistry Department, University of Mazandaran, PO Box 453, Babolsar, Iran; 2Chemistry Department, Payame Noor University, PO Box 4697, Tehran, Iran; 3Chemistry Department, Islamic Azad University, Ayatollah Amoli Branch, PO Box 678, Amol, Iran
  • Received:2012-02-20 Revised:2012-07-11 Online:2012-09-11 Published:2012-09-11

Abstract: A protocol for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and -thiones was developed by means of a three-component condensation of an aldehyde, a β-dicarbonyl compound, and urea or thiourea in acetic acid catalyzed by silica-bonded S-sulfonic acid. Compared to the classical Biginelli reaction conditions, this new protocol has the advantages of consistently excellent yields and short reaction times. After the reaction, the catalyst could be recovered easily and reused with little change in its activity.

Key words: Biginelli reaction, silica-bonded S-sulfonic acid, dihydropyrimidinone