Antibacterial and antifungal activities of new pyrazolo[3,4-d]pyridazin derivatives

Several new pyrazolo[3,4-d]pyridazin derivatives were prepared by the reaction of two new 1H-pyrazole-3-carboxylic acids and various hydrazines. The compounds were tested for antimicrobial activities against Gram-negative, Gram-positive bacteria and fungi. The compounds named as 7e, f had the highest antimicrobial activities against Gram-negative, Gram-positive bacteria and fungi with minimum inhibitory concentrations in the range of 0.31 to < 0.0024 mg ml-1 .