Benzimidazole plays an important role in the medicinal chemistry and drug discovery with many pharmacological activities which have made an indispensable anchor for discovery of novel therapeutic agents. Substitution of benzimidazole nucleus is an important synthetic strategy in the drug discovery process. Therapeutic properties of the benzimidazole related drugs have encouraged the medicinal chemists to synthesize novel therapeutic agents. Therefore, it is required to couple the latest information with the earliest information to understand the current status of benzimidazole nucleus in drug discovery. In the present review, benzimidazole derivatives with different pharmacological activities are described on the basis of substitution pattern around the nucleus with an aim to help medicinal chemists for the development of SAR on benzimidazoles for each activity. This article aims to review the work reported, chemistry and pharmacological activities of benzimidazole derivatives during past years.
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