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A number of 1N-substituted-2-methyl benzimidazole derivatives have been synthesized and tested for their antibacterial activities. The chemical structures of the newly synthesized compounds were verified on the basis of spectral and elemental methods of analyses. Investigation of antimicrobial activity of the compounds was done by disc diffusion method using Gram-positive (S. aureus, S. mutans and B. subtilis), Gram-negative (E. coli, S. typhi and P. aeruginosa) bacteria and fungi (C. albicans, A. flavus and A. niger). Among the compounds tested 5a, 5b, 5d, 5i, 5j and 5k exhibited good antibacterial activities against Gram positive bacteria, while 5d and 5i also showed notable antifungal activity. Specially compounds 5a and 5b exhibited appreciable activity against S. aureus and B. subtilis comparable to reference drugs.

A number of N'-(arylmethylidene)-2-(2-methyl-1H-benzimidazol--1-yl)acetohydrazide and 4-aryl-5-[(2-methyl-1H-benzimidazol-1-yl)methyl]--4H-1,2,4-triazole-3-thiol derivatives were synthesized by incorporating various aromatic and heterocyclic substituents on 2-methyl-1H-benzimidazole. The structures of all the synthesized compounds were elucidated based on their elemental analyses and spectral data. The in vitro activities of these compounds against bacteria and fungi were evaluated by the disc diffusion and the minimum inhibitory concentration (MIC) methods. Some of the synthesized derivatives were found to be as active as kanamycin (standard drug).

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