Molecular Diversity

, Volume 22, Issue 4, pp 815–825 | Cite as

New 7-piperazinylquinolones containing (benzo[d]imidazol-2-yl)methyl moiety as potent antibacterial agents

  • Hojat-Allah Arab
  • Mohammad Ali Faramarzi
  • Nasrin Samadi
  • Hamid Irannejad
  • Alireza Foroumadi
  • Saeed Emami
Original Article


A series of 7-piperazinylquinolones containing a (benzo[d]imidazol-2-yl)methyl moiety were designed and synthesized as new antibacterial agents. The antibacterial activity of title compounds was evaluated against Gram-positive (Staphylococcus aureus, Staphylococcus epidermidis and Bacillus subtilis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa and Klebsiella pneumonia) microorganisms. Among the tested compounds, the N1-cyclopropyl derivative 4a showed the highest activity against S. aureus, S. epidermidis, B. subtilis and E. coli (\(\text {MIC} = 0.097\) \(\upmu \)g/mL), being 2–4 times more potent than reference drug norfloxacin. A structure-activity relationship study demonstrated that the effect of the nitro group on the benzimidazole ring depends on the pattern of substitutions on the piperazinylquinolone.


Antibacterial activity 1H-benzo[d]imidazole 7-piperazinylquinolones Docking study 



This work was supported by a Grant (No. 833) from the Research Council of Mazandaran University of Medical Sciences, Sari, Iran.

Supplementary material

11030_2018_9834_MOESM1_ESM.docx (4 mb)
Supplementary material 1 (docx 4061 KB)


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Student Research Committee, Faculty of PharmacyMazandaran University of Medical SciencesSariIran
  2. 2.Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research CenterTehran University of Medical SciencesTehranIran
  3. 3.Department of Drug and Food Control, Faculty of PharmacyTehran University of Medical SciencesTehranIran
  4. 4.Department of Medicinal Chemistry and Pharmaceutical Sciences Research Center, Faculty of PharmacyMazandaran University of Medical SciencesSariIran
  5. 5.Department of Medicinal Chemistry, Faculty of Pharmacy and The Institute of Pharmaceutical Sciences (TIPS)Tehran University of Medical SciencesTehranIran

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