Journal
NEW JOURNAL OF CHEMISTRY
Volume 40, Issue 12, Pages 10412-10417Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nj03120j
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- University Grant Commission
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In this report, an efficient high-yield method for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones via a three-component Biginelli reaction with various aldehydes, beta-ketoesters/beta-diketones and urea/thiourea is described. The reaction was catalyzed by sulfated polyborate under solvent free conditions at 100 degrees C. The catalyst was prepared and used as a Bronsted as welt as Lewis acid catalyst. The catalyst was prepared by dehydration of boric acid followed by sulfonation and was characterized by different analytical techniques. The key advantages of the present method are the ability to tolerate a variety of functional groups, high yields, short reaction times, solvent free conditions, easy work-up, and recyctability of the catalyst, thus providing economical as well as ecological advantages.
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