Abstract
New series of novel functionalized thiazoles, 1,3,4-thiadiazoles and pyrido[2,3-d][1,2,4]triazolo[4,3-a]pyrimidines containing pyrazole moiety were synthesized using 4-acetylpyrazole as a precursor. The structures of the compounds prepared were confirmed by both spectral and elemental analyses and by alternative synthetic routes. The mechanisms of the studied reactions were also discussed. Sixteen compounds were evaluated for their in vitro antimicrobial activity. The results proclaimed that some of the tested compounds exhibited moderate to significant antibacterial and antifungal activities. Compounds lie, 11a, and lid exhibited high antibacterial activity against Bacillus subtilis compared with reference drug (Ampicillin) while compounds 11a, 6g, 18e, 18a, 11d, 6a, 11c, lib and 6d exhibited higher antifungal activity against Syncephalastrum racemosum than reference drug (Amphotericin B).