నైరూప్య

Design, Synthesis and Biological Evaluation of Novel N-1 and C-3 Functionalized Isatin Derivatives as FAAH Inhibitors

Shivani Jaiswala

Fatty acid amide hydrolase (FAAH) inhibition activity a valuable strategy for the treatment of several CNS disorders, including pain, depression, and anxiety. In the search for better FAAH inhibitors with potent activity; based on our previous isatin based lead compound 8c, we designed and synthesized a series of structural analogs of 8c by varying the substitutions at both N-1 and C-3 of the isatin scaffold. The synthesized compounds tested for In vitro FAAH inhibition activity. All tested compounds showed the inhibition against FAAH in nanomolar to micromolar range 6.7 nM to 207.8 µM. Compound 5e (Z)-3-((1H-benzo[d]imidazol-2-yl)imino)-1-allylindolin-2-one with IC50 value of 0.006734±0.002 µM emerged as the most potent reversible inhibitor with ki value 5 nM, examined towards FAAH with almost 1500 times more potency than our previous lead 8c (IC50 =1.49 ± 0.03µM). Molecular docking studies supported the experimental results revealing that all compounds well-occupied the enzymatic cleft with optimal binding orientation and interactions within the active site of FAAH. Moreover, Compound 5e was found to be significantly more potent anxiolytic as well as potent antidepressant as compared to reference drug citalopram and diazepam respectively. Lead compound 5e was also found non-neurotoxic and satisfactory drug-like characteristics and ADMET properties and thus considered for further evaluation.