Synthesis and Biological Evaluation of Benzimidazole Derivatives as Potential Antidiabetic Agents

Abstract

Diabetes mellitus, particularly type 2 diabetes mellitus, remains a major metabolic disorder characterized by persistent hyperglycemia arising from insulin resistance, impaired insulin secretion, and progressive pancreatic β-cell dysfunction. Despite the availability of several glucose-lowering therapies, limitations associated with adverse effects, variable therapeutic response, treatment adherence, and progressive loss of efficacy justify the continued search for structurally novel antidiabetic agents. In the present study, a series of substituted benzimidazole derivatives was designed and synthesized to explore the influence of structural modification on antidiabetic activity. The target compounds were prepared using suitable condensation, cyclization, and functionalization reactions, followed by purification through recrystallization or chromatographic techniques. Structural characterization was performed using physicochemical parameters and spectroscopic techniques including FT-IR, ^1H NMR, ^13C NMR, and mass spectrometry. The synthesized derivatives were screened for in vitro antidiabetic activity through α-glucosidase and α-amylase inhibitory assays, with acarbose employed as the reference inhibitor. Concentration-response studies were used to determine percentage inhibition and IC₅₀ values. The synthesized compounds displayed concentration-dependent inhibition of both carbohydrate-hydrolyzing enzymes, although inhibitory potency varied according to the nature and position of substituents on the benzimidazole scaffold. Selected derivatives demonstrated comparatively strong inhibitory activity and lower IC₅₀ values, indicating that appropriate electronic, hydrophobic, and hydrogen-bonding features contributed to improved biological activity. Structural confirmation and preliminary structure–activity observations further supported the successful development of the derivative library. The most promising compounds were considered suitable for subsequent molecular docking, molecular dynamics, drug-likeness, ADMET, cytotoxicity, and further pharmacological evaluation. Overall, the findings demonstrate that rational modification of the benzimidazole nucleus can generate promising candidates with potential application in the development of novel antidiabetic agents targeting carbohydrate-hydrolyzing enzymes.