In the last 2-3 decades, the broad research in the application of benzimidazole derivatives made it important for mankind. Many scientists have worked on benzimidazole derivatives and they found that this compound has a diverse role in the field of medicinal chemistry. Few benzimidazole derivatives are currently in the market as a drug candidate against various diseases. Moreover, the benzimidazole derivatives exhibit pharmacological activities such as anti-tuberculosis, anti-malarial, antihistamine, antimicrobial, antiviral, antidiabetic, anticancer, anti-fungal, anti-inflammatory, analgesic, anti-HIV, etc. In this review, we have summarized various derivatives of benzimidazole which have been prepared by many researchers to understand the chemistry as well as diverse pharmacological activities. These findings may lead the scientists who are working in the field of medicinal chemistry to the development of benzimidazole based drug candidates in the future.

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In the current investigation, we prepared a series of novel spiro[indole-thiazolidines] derivatives (5a-5h) from 5-substituted isatin derivatives and thioglycolic acid (TGA) with ZrSiO as an efficient catalyst under microwave irradiation. The significant merits of this protocol have some significant merits such as simplicity in operation, simple, efficient workup, good practical yields of product and the employment of recyclable catalyst. All the new synthesized scaffold has been well characterized by various spectroscopic methods and elemental analysis. All the spiro scaffolds were subjected to in vitro anti-mycobacterial activity against the Mycobacterium tuberculosis (HRv) strain. We have carried out molecular docking study of our synthesized compounds. We also calculated theoretically ADME-Tox parameters for synthesized compounds.

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