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Oxalic acid as a versatile catalyst for one pot facile synthesis of 3,4-dihydropyrimidin-2-(1H)-ones and their thione analogues

✍ Scribed by Jaiprakash N. Sangshetti; Devanand B. Shinde; Nagnnath D. Kokare

Publisher: Journal of Heterocyclic Chemistry
Year: 2008
Tongue: English
Weight: 242 KB
Volume: 45
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570450440

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✦ Synopsis

Abstract

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3,4‐Dihydropyrimidin‐2‐(1__H__)‐ones and their thione analogues are synthesized from the condensation of aromatic aldehydes, β‐dicarbonyl compound and urea or thiourea in presence of 5 mol% of oxalic acid in ethanol‐water (1:2; v/v) under mild reaction conditions. The yields obtained are better and also the use of very inexpensive catalyst, environmentally benign solvent and easy work‐up are the advantageous aspects of the present method.

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