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Synthesis 2002(4): 0466-0470
DOI: 10.1055/s-2002-20956
DOI: 10.1055/s-2002-20956
PAPER
© Georg Thieme Verlag Stuttgart · New York
Catalysis of the Biginelli Reaction by Ferric and Nickel Chloride Hexahydrates. One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones
Further Information
Received
19 November 2001
Publication Date:
28 July 2004 (online)
Publication History
Publication Date:
28 July 2004 (online)
Abstract
An efficient synthesis of 3,4-dihydropyrimidinones from the aldehyde, β-keto ester and urea in ethanol, using ferric chloride hexahydrate or nickel chloride hexahydrate as the catalyst, is described. Compared with the classical Biginelli reaction conditions, this new method has the advantage of excellent yields (53-97%) and short reaction time (4-5 hours).
Key words
Biginelli reaction - dihydropyrimidine-2(1H)-ones - nickel chloride hexahydrate - ferric chloride hexahydrate
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