Antiinflammatory, analgesic and antipyretic activity of certain thiazolidinones

The thiazolidin-4-one derivatives and the corresponding spiro compounds were synthesized from sulphanilamide and were evaluated for anti-inflammatory and analgesic activity in acute and sub acute models. Compounds were also evaluated for antipyretic and cyclooxygenase enzyme inhibitory activity. All the compounds showed significant antiinflammatory, analgesic and antipyretic activity at 100 mg/kg in all the models. The compounds B1, B2, B5, B6, and B8 showed maximum inhibition of COX-2 activity without inhibiting the COX-1 activity. The nimesulide was used as standard drug for comparison. The substitution at R, R(1) and R(2) with the functional groups Cl, OCH(3), NO(2) and OH in the aromatic ring resulted in increased activity as compared to unsubstituted thiazolidin-4-ones. However the substitution at R(3) with spiro group did not improve the activity. The study suggests that COX-2 binding site may not be a rigid structure but might adopt to various related molecules.