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We designed and synthesized novel 2,3-disubstituted quinazolin-4(3 H)-ones by microwave technique and characterized them by spectral analysis. Synthesized compounds were screened for cytotoxicity and for antiviral activity against influenza A (H1N1, H3N2 and H5N1), severe acute respiratory syndrome corona, dengue, yellow fever, Venezuelan equine encephalitis (VEE), Rift Valley fever, and Tacaribe viruses in cell culture. A neutral red uptake assay was used to determine 50% virus-inhibitory concentrations (EC 50 ) of test compounds and their 50% cytotoxicity concentration (CC 50 ) in uninfected Madin-Darby canine kidney, Vero, and Vero 76 cells; selectivity indices (ratio of CC 50  to EC 50 ) were derived from the data. The compound 4-(6,8-dibromo-4-oxo-2-phenyl quinazolin-3(4 H)-yl)-N-(4,5-dimethyloxazol-2yl) benzenesulphonamide 15 inhibited the replication of avian influenza (H5N1) virus (EC 50 =8.4 µg/ml, CC 50 &gt;100 µg/ml, SI&gt;11.9) as did 4-(6-bromo-4oxo-2phenylquinazolin-3(4 H)-yl) benzene]sulphonamide 5 (EC 50 =3 µg/ml, CC 50 =32 µg/ml, SI=11). Compound 5 was also moderately active against VEE and Tacaribe viruses. The methodology described in this report is applicable for rapid synthesis of many compounds with potential antiviral properties.

antiviral chemistry and chemotherapy

Novel 3-sulphonamido-quinazolin-4(3<i>H</i>)-One Derivatives: Microwave-Assisted Synthesis and Evaluation of Antiviral Activities against Respiratory and Biodefense Viruses

Novel 3-sulphonamido-quinazolin-4(3H)-One Derivatives: Microwave-Assisted Synthesis and Evaluation of Antiviral Activities against Respiratory and Biodefense Viruses