Synthesis, Characterization of Benzimidazole Derivatives carrying Pyridine Moiety

A new series of 1-methyl-2{[(3, 4, 5-tri substituted pyridine2-yl) methyl] sulfanyl}-5-nitro-1H-benzimidazoles 3a-3b were synthesized by coupling 1-methyl-2-mercapto-5-nitro-1H-benzimidazole 1 with various pyridine derivatives 2a-2b in the presence of a base at room temperature, Upon further oxidation of these Benzimidazole derivatives 3a-3b in presence of MCPBA gives 1-methyl-2{[(3, 4, 5-tri substituted pyridine2-yl) methyl] sulfinyl}-5-nitro-1H-benzimidazoles 4a-4b. The group frequencies of IR and NMR spectra were assigned.