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AbstractBenzimidazole is a privileged heterocyclic framework extensively known for its rich pharmacological promise, mainly because of its purine-like framework, allowing effective coupling to various targets in biology. This heterocyclic compound, derived by fusion of a benzene and an imidazole ring, is a useful platform in drug discovery with an extensive range of biological activities, such as antimicrobial, antiviral, antifungal, anticancer, anti-inflammatory, antihypertensive, analgesic, antitubercular, antiparasitic and anthelminthic effects1. The ease of modification of the benzimidazole nucleus at critical positionsespecially N-1 and C-2provides the opportunity for far-reaching structureactivity relationship optimizations to improve potency, selectivity, and pharmacokinetics. Recent developments in synthetic methodologies, including microwave-assisted synthesis, multicomponent reactions, and green chemistry methods, have allowed efficient access to new benzimidazole derivatives. Of particular interest are benzimidazole-derived drugs such as albendazole, mebendazole, thiabendazole, and omeprazole, which have found therapeutic utility, highlighting the scaffold's drug-like significance1. Studies indicate the role of electronic effects and patterns of substitution, particularly electron-withdrawing groups, to increase biological activity in various pharmacological classes. In addition, the introduction of benzimidazole in hybrid molecules and metal complexes has created new horizons for better therapeutic results. This review integrates existing information regarding benzimidazole chemistry, biology, and medicinal uses, highlighting its potential in meeting the challenges of global health, including antimicrobial resistance, neglected tropical diseases, and cancer. Further investigation of benzimidazole derivatives holds the promise of unveiling novel remedies, reiterating its position as a pillar in contemporary medicinal chemistry and a desirable scaffold for upcoming drugs.1.IntroductionBenzimidazole is a well-known bicyclic heterocycle formed by the fusion of a benzene ring with an imidazole ring. This unique structure closely resembles purine bases found in nucleotides, enabling benzimidazole derivatives to mimic natural nucleotides and interact effectively with a variety of biological targets such as enzymes, receptors, and nucleic acids. Thanks to this structural versatility, benzimidazole has earned a significant place as a core scaffold in medicinal chemistry and plays a pivotal role in modern pharmaceutical development.Since its biological significance was first recognized, benzimidazole has been associated with an impressive range of pharmacological activitiesincluding antimicrobial, antiviral, antifungal, anticancer, anti-inflammatory, and antiparasitic effects. These diverse therapeutic properties have paved the way for the development of several benzimidazole-based drugs that are widely used in clinical practice today, such as albendazole, mebendazole, thiabendazole, and omeprazole.One of benzimidazoles greatest strengths lies in its synthetic flexibility. The ability to modify the nucleus at various positionsparticularly at N-1 and C-2allows chemists to conduct detailed structureactivity relationship (SAR) studies, fine-tuning its potency, selectivity, and pharmacokinetic properties. This adaptability has made benzimidazole an attractive candidate for developing treatments for some of the most pressing global health challenges, including antimicrobial resistance, neglected tropical diseases, and cancer.Recent advances in synthetic methodologies, combined with powerful tools such as molecular modeling and target-based drug design, have led to the creation of novel benzimidazole derivatives with improved biological profiles. Moreover, innovative strategies such as incorporating benzimidazole into hybrid molecules or metal complexes have shown promising results in enhancing therapeutic outcomes.In light of these developments, this paper seeks to provide a comprehensive overview of benzimidazoles structural characteristics, diverse biological activities, and broad medicinal applications. Special emphasis is placed on recent progress in synthetic approaches, pharmacological evaluation, and the mechanistic understanding of its varied therapeutic effects. By highlighting both its traditional uses and cutting-edge innovations, this review reinforces benzimidazoles enduring relevance and remarkable potential in modern drug discovery.

Copyright © 2025 Mr. Yuvaraja G. This is an open access article distributed under the Creative Commons Attribution License.