Application of β-Oxodithioesters in Domino and Multicomponent Reactions: Facile Route to Dihydropyrimidines and Coumarins
作者:Okram Mukherjee Singh、Nepram Sushuma Devi
DOI:10.1021/jo802585b
日期:2009.4.17
A facile route to hitherto unknown 5-methylmercaptothio-carbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones and substituted 2H-chromene-2-thiones has been developed. SnCl2 catalyzed cyclocondensation of beta-oxodithioesters with a variety of readily accessible aldehydes and urea affords the dihydropyrimidinones. The methodology involves the three-component Biginelli reaction. On the other hand, substituted salicylaldehyde and beta-oxodithioesters reacted under the same condition to afford the substituted 2H-chromene-2-thiones in high yields.