Volume 50, Issue 2 pp. 391-395
Note

Magnesium Bromide and Magnesium Chloride Hexahydrate Catalyzed One-Pot Synthesis of Dihydropyrimidines via Biginelli Reaction under Solvent-Free Conditions

Şirin Gülten

Corresponding Author

Şirin Gülten

Department of Chemistry, Faculty of Arts and Sciences, Çanakkale Onsekiz Mart University, Çanakkale 17020 Turkey

E-mail: [email protected]Search for more papers by this author
First published: 04 April 2013
Citations: 11

Abstract

Biologically important 12 new important 3,4-dihydropyrimidin-2-(1H)-ones (-thiones) were synthesized with in one-pot three-component Biginelli reaction from the corresponding aromatic aldehydes (5-methyl-2-thiophenecarboxaldehyde and 2-chloro-5-nitrobenzaldehyde), β-keto esters (ethylacetoacetate, allylacetoacetate, and t-butylacetoacetate), and urea/thiourea in the presence of catalytic amount of magnesium bromide and magnesium chloride hexahydrate as nontoxic, inexpensive, and easily available catalysts under solvent-free conditions at 80 and 100°C. Compared with the catalyst-free three-component Biginelli reaction conditions, this method consistently has the advantage of short reaction time (45–100 min) and good to excellent yields (75–91%).

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