Benzothiazole‐Propanamide Linker Pyrrolidine (Morpholine) as Monoamine Oxidase‐B and Butyrylcholinesterase Inhibitors

Abstract

According to the fusion technique create effective multi‐target‐directed ligands, in this study, we designed and synthesized a series of benzo[d]thiazol‐2‐yl)‐3‐(pyrrolidin‐1‐yl) or 3‐(morpholino‐1‐yl)propanamide derivatives, and evaluated their inhibitory potency against MAOs, AChE, BuChE by in vitro enzyme effect assays. Based on activity results, we found that derivatives N‐(5‐methylbenzo[d]thiazol‐2‐yl)‐3‐(pyrrolidin‐1‐yl)propanamide (2c) and N‐(6‐bromo‐ benzo[d]thiazol‐2‐yl)‐3‐(pyrrolidin‐1‐yl)propanamide (2h) showed good inhibitory potency against BuChE with IC50 values of 15.12 μM and 12.33 μM, respectively. Besides, 2c and 2h also exhibited selective MAO‐B inhibitory effects with inhibition rates of 60.10 % and 66.30 % at 100 µM, respectively. In contrast, all designed derivatives were poor active against AChE and MAO‐A at a concentration of 100 μM. The toxicity analysis in vitro by MTT and AO/EB fluorescence staining confirmed that 2c and 2h were nontoxic up to 100 μM. Molecular modeling studies showed that 2c and 2h could bind to the active site of BuChE. This research paves the way for further study aimed at designing MAO‐B and BuChE inhibitors for the treatment of neurodegenerative disorders.

An in vitro analysis of an innovative standardized phospholipid carrier-based Melissa officinalis L. extract as a potential neuromodulator for emotional distress and related conditions

“…Monoamine oxidase A (MAO-A) inhibition assay was performed using the MAO-A Inhibitor Screening Assay Kit (Abcam, Cambridge, United Kingdom) ( Supplementary Information S1 ) ( He et al, 2023 ). Briefly, 10 µL MO extract solution and kit-positive control (clorgyline) solution were added to a 96-well plate.…”