Pyrazolone derivatives: synthesis, anti-inflammatory, analgesic, quantitative structure-activity relationship and in vitro studies.

Some 1-(4-chlorophenyl or benzenesulfonamide)-2,3- and/or 4-substituted-1H-pyrazol-5(4H)-one derivatives were synthesized and screened for their anti-inflammatory and analgesic activities, in addition to their ulcerogenic liability. They were found to be active as anti-inflammatory and analgesic agents. Compound 6b was found to be the most active as anti-inflammatory agent and compound 9b was found to be the most active one as anti-inflammatory and analgesic agent. On the other hand, cyclooxygenase-1/-2 (COX-1)/COX-2 isozyme selectivity was also done and the tested compounds showed equal inhibition to both isoforms. Moreover, 2D-quantitative structure-activity relationship (QSAR) studies revealed well predictive and statistically significant and cross validated QSAR model that helps to explore some expectedly potent compounds.