The 3-substituted oxindole derivatives were designed, synthesized, and evaluated for antidepressant activity by employing forced swimming test, tail suspension test, and MAO-A inhibition assay. Results of biological studies revealed that the majority of compounds exhibited potent to moderately potent activity and among them, 12 displayed potency comparable to that of the imipramine with %DID of 37.95 and 44.84 in the FST and TST, respectively. At the same time, imipramine showed %DID of 43.62 and 50.64 in the FST and TST, correspondingly. In the MAO-A inhibition assay, 12 showed an IC50 of 18.27 μmol, whereas the reference drug moclobemide displayed an IC50 of 13.1 μmol. The SAR study disclosed that the presence of bromo atom at the phenyl/furanyl or thienyl moiety in the oxindole derivatives was critical for the antidepressant activity.
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