AntiHIV, antibacterial and antifungal activities of some novel 1,4-disubstituted-1,2,4-triazolo[4,3-a] quinazolin-5(4<i>h</i>)-ones

The title compounds 1-substituted-4-phenyl-1,2,4-triazolo[4,3-a]quinazolin-5(4 H )-ones were synthesized by the cyclization of 2-hydrazino-3-phenylquinazolin-4(3 H )-one with various one carbon donors. The starting material 2-hydrazino-3-phenylquinazolin-4(3 H )-one was synthesized from aniline. Investigation of antimicrobial activity of the test compounds was made by agar cup-plate method against 8 pathogenic bacteria including Mycobacterium tuberculosis , 3 pathogenic fungi and antiHIV activity against replication of HIV-1(IIIB) and HIV-2(ROD) in MT-4 cells. The compound 7e inhibited 21% growth of M. tuberculosis at 6.25 µg/ml concentration, while the compounds 7c and 7d showed good antifungal activity against Candida albicans ; and the compounds 7c exhibited good antifungal activity against Aspergillus niger .