Aim: To search for new derivatives of diclofenac (DC) having higher potency than the parent drug and lacking its undesirable effects.
Methods: Coupling DC with NO donor 3-hydroxymethyl-4-phenylfuroxan and its isomer through esterification, evaluating anti-inflammatory and analgesic activities, observing side effects in the rat gastrointestinal (GI) tract and assessing NO releasing ability both in vitro and in vivo.
Results: Fifteen new compounds including nine target ones (II1-9) were synthesized, and their structures were determined by IR, 1HNMR, MS and elemental analysis. Compounds II3 and II9 showed anti-inflammatory activity comparable to DC. Compound II2 showed stronger anti-inflammatory and analgesic activities and less GI side effect than DC, and released NO in vivo.
Conclusion: Compound II2 is worthy to be intensively studied.
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