Mannich ‐Benzimidazole Derivatives as Antioxidant and Anticholinesterase Inhibitors: Synthesis, Biological Evaluations, and Molecular Docking Study

A series of Mannich bases of benzimidazole derivatives having a phenolic group were designed to assess their anticholinesterase and antioxidant activities. The acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) inhibitory activities were evaluated in vitro by using Ellman's method. According to the activity results, all of the compounds exhibited moderate to good AChE inhibitory activity (except for 2a), with IC50 values ranging from 0.93 to 10.85 μM, and generally displayed moderate BuChE inhibitory activity. Also, most of the compounds were selective against BuChE. Compound 4b was the most active molecule on the AChE enzyme and also selective. In addition, we investigated the antioxidant effects of the synthesized compounds against FeCl2/ascorbic acid‐induced oxidative stress in the rat brain in vitro, and the activity results showed that most of the compounds are effective as radical scavengers. Molecular docking studies and molecular dynamics simulations were also carried out. A series of Mannich bases of benzimidazole derivatives with a phenolic group were synthesized and assayed for their antioxidant activities and acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) inhibitory properties. 2‐[(Diethylamino)methyl]‐4‐(5‐nitro‐1H‐benzo[d]imidazol‐2‐yl)phenol (4b) (IC50 = 0.93 µM) showed the best inhibitory activity toward AChE. Most of the compounds are almost equally active compared to tert‐butyl hydroquinone as antioxid...
Source: Archiv der Pharmazie - Category: Drugs & Pharmacology Authors: Tags: Full Paper Source Type: research