No abstract

Microwave promoted diammonium hydrogen phosphate, (NH4)2HPO4, catalyzed three-component Biginelli reaction between an aldehyde, a 1,3-dicarbonyl compound and urea or thiourea under solvent-free conditions afforded the corresponding dihydropyrimidinones and quinazolinones in high yields. The synthesized compounds have been screened for their antimicrobial activity against Pseudomonas aeruginosa, Staphylococcus aureus, Vibrio choloriae, Shigella dysenteriae, Salmonella typhi bacteria and Aspargilllus flavus, Saccharomyces cerevisiae and Candida albicans fungi respectively. Some of the synthesized compounds exhibited pronounced antimicrobial activities.Keywords: Multicomponent reactions; Dihydropyrimidinone; Microwave irradiation; Antimicrobial activity.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.8688J. Sci. Res. 4 (1), 143-153 (2012)

The starting materials, 2-amino-4-phenylthiazole and 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole, were prepared by reacting thiourea with acetophenone and cyclohexanone in the presence of iodine under heating on a water bath with occasional stirring, respectively. Reaction of 2-amino-4-phenylthiazole and 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole with various sugars afforded  corresponding N-glycoside derivatives in good yields. The structures of the synthesized N-glycosides derivatives have been established on the basis of their IR and NMR spectral data. The obtained compounds were screened for their antimicrobial activity.  Some of them were found to possess significant activities, when compared to standard drugs. The Chittagong Univ. J. Sci. 40(1) : 68-84, 2019