One step synthesis of pyrido[1,2-a]benzimidazole derivatives of aryloxypyrazole and their antimicrobial evaluation

A new series of pyrido[1,2-a]benzimidazole derivatives bearing the aryloxypyrazole nucleus have been synthesized by base-catalyzed cyclocondensation reaction through multi-component reaction (MCR) approach. All the synthesized compounds were investigated against a representative panel of pathogenic strains using broth microdilution minimum inhibitory concentration (MIC) method for their in vitro antimicrobial activity. Reviewing the data, majority of the compounds were found to be active against employed pathogens. SAR study explores that antimicrobial activity is strongly depends on the nature of the substituents at the ether linked aryl ring attached to the pyrazole unit, together with the substituent present on the C-5 of the benzimidazole unit. (C) 2013 Manish P. Patel. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.