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1,3-Dibromo-5,5-dimethylhydantoin as a useful reagent for efficient synthesis of 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions

✍ Scribed by Mohammad Abdollahi-Alibeik; Zahra Zaghaghi

Book ID: 111491196
Publisher: Versita
Year: 2009
Tongue: English
Weight: 160 KB
Volume: 63
Category: Article
ISSN: 0366-6352
DOI: 10.2478/s11696-008-0084-1

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✦ Synopsis

Abstract

Efficient syntheses of 3,4-dihydropyrimidin-2-(1H)-ones and the corresponding thioxo derivatives using 1,3-dibromo-5,5-dimethylhydantoin (DBH) catalysis of a one-pot three-component Biginelli reaction of aldehydes, ethyl acetoacetate, and urea or thiourea under microwave irradiation are described. The advantages of this method are its short reaction times, high yields of the products, inexpensive and commercially available catalyst, and solvent-free conditions. Typical isolated yields exceed 70 % for arylaldehydes (9 examples) and aliphatic aldehydes (2 examples).

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