New series of pyrazoles 4a-c and pyrazolopyrimidines 5a -f had been constructed. The newly synthesized compounds were assessed for their antimicrobial activity towards E. coli and P. aeruginosa (gram -ve bacteria), B. subtilis and S. aureus (gram + ve bacteria) and A. flavus and C. albicans (representative of fungi). The pyrazolylpyrimidine-2,4-dione derivative 5b is the most active candidate against B. subtilis (MIC = 60 μg/mL) and P. aeruginosa (MIC = 45 μg/mL). Regarding antifungal potential, compound 5f was the most effective against A. flavus (MIC = 33 μg/mL). Similarly, compound 5c displayed strong antifungal activity towards C. Albicans (MIC = 36 μg/mL) in reference to amphotericin B (MIC = 60 μg/mL). Finally, the novel compounds had been docked inside dihydropteroate synthase (DHPS) to suggest the binding mode of these compounds.