Synthesis and Antibacterial Evaluation of 2-Ethyl-1-(4-substituted)phenyl-1 H-imidazole Derivatives as Open-Chain Analogues of 7-Alkoxyl-4,5-dihydro-imidazo[1,2-a]quinolines

A novel series of 2-ethyl-1-(4-substituted)phenyl-1H-imidazole derivatives was designed, synthesized, and tested for its antibacterial activity against various bacterial strains. Most of the synthesized compounds showed potent inhibition of several Gram-positive and Gram-negative bacterial strains with minimum inhibitory concentration (MIC) values in the range of 4-256 nmol mL^-1 in vitro. The compound [2-ethyl-1-(4-pentoxy)phenyl-1H-imidazole] exhibited the most potent inhibitory activity. The MIC of this compound against S. aureus was found to be 8 nmol mL^-1, smaller than that of the reference agents, ciprofloxacin and amoxicillin. Furthermore, the compound exhibited modest activity against several bacterial strains in a dose range of 8-256 nmol mL^-1.

Keywords:
2-ethyl-1-(4-substituted)phenyl-1H-imidazole; drug design; MIC; antibacterial activity