Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31097
In vitro Anti-tubercular Screening of Newly Synthesized Benzimidazole Derivatives

Authors: M. Shahar Yar, M. Mustaqeem Abdullah, Jaseela Majeed


A series of 1-(1H-benzimidazol-2-yl)-3-(substituted phenyl)-2-propen-1-one were allowed to react with hydrazine hydrate and phenyl hydrazine in submitted reactions to get pyrazoline and phenyl pyrazoline derivatives. All the compounds entered for screening at the Tuberculosis Antimicrobial Acquisition and Coordinating Facility (TAACF) for their in vitro antibacterial activity against Mycobacterium tuberculosis H37Rv strain (ATCC 27294) using Microplate Alamar Blue Assay (MABA) susceptibility test. The results expressed as MIC (minimum inhibitory concentration) in μg/mL. Among the fifteen compounds, eight compounds were found to have MIC values less than 10 μg/mL. These were subjected for cytotoxicity assay in VERO cells to determine CC50 (cytotoxic concentration 50%) values and finally SI (Selectivity Index) were calculated. Compound (XV) 2-[5-(4- fluorophenyl)-1-phenyl-4,5-dihydro-1H-3-pyrazolyl]-1Hbenzimidazole was considered the best candidate of the series that could be a good starting point to develop new lead compounds in the fight against tuberculosis.

Keywords: pyrazoline, benzimidazole, anti-tubercular activity

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1601


[1] Brenwald, N.P., Gill, M.J., and Wise, R .(1998) Prevalence of a putative efflux mechanism among fluoroquinolone -resistant clinical isolates of streptococcus pneumoniae.Antimiarob.Agents.Chemother 42,2032- 2035.
[2] Klemens,S.P., De Stefano,M.S., and Cynamon,M.H (1993.Therapy of multidrug resistant tuberculosis:lessons from studies with mice. Antimiarob.Agents.Chemother 37, 2344-2347.
[3] Corbett,E.L., Watt,C.J., Walker,N.,Maher,D., Williams,B.G., Raviglione,M.C., and Dye,C.(2003) The growing burdens of tuberculosis:global trends and interactions with HIV epidemic. Arch Intern Med 163,1009-1021
[4] Aridoss, G., Amirthaganesan, S., Kumar, N.A., Kim, J.T., Lim, K.T., Kabilan, S., Jeong, Y.T. A facile synthesis, antibacterial, and antitubercular studies of some piperidin-4-one and tetrahydropyridine derivatives. Bioorg Med Chem Lett. 2008, 18(24):6542-8. Epub 2008 Oct 14.
[5] Gill, C., Jadhav, G., Shaikh, M., Kale, R., Ghawalkar, A., Nagargoje, D., Shiradkar. Clubbed (1, 2, 3) triazoles by fluorine benzimidazole: a novel approach to H37Rv inhibitors as a potential treatment for tuberculosis M. Bioorg Med Chem Lett. 2008, 18(23):6244-7. Epub 2008 Oct 2
[6] Mohamed, B.G., Hussein, M.A., Abdel-Alim, A.A., Hashem, M. Synthesis and antimicrobial activity of some new 1-alkyl-2-alkylthio-1, 2, 4-triazolobenzimidazole derivatives. Arch Pharm Res. 2006, 29(1):26-33.
[7] Gasparová, R., Lácová, M., el-Shaaer, H.M., Odlerová, Z. Synthesis and antimycobacterial activity of some new 3-heterocyclic substituted chromones. Farmaco. 1997, 52(4):251-3.
[8] Geban, O., Ertepinar, H., Ozden, S. QSAR analysis of a set of benzimidazole derivatives based on their tuberculostatic activities. Pharmazie. 1996, 51(1):34-6.
[9] Alunni Bistocchi, G., De Meo, G., Pedini, M., Ricci, A., Bastianini, L., Sposini, T., Sbaraglia, G., Jacquignon, P. (New heterocyclic derivatives of benzimidazole with germicidal activity. III. Synthesis and activity of derivatives of (formyl-5'-furyl-2')-2-benzimidazole with different substitutions at position 5). Farmaco (Sci). 1986 41(12):970-83.
[10] Bell, S.C., Wei, P.H. Syntheses of heterocylic fused thiazole acetic acids. 2. Bell SC, Wei PH. J Med Chem. 1976, 19(4):524-30.
[11] Sawlewicz J, Milczarska B, Manowska W. Reactions of cyanomethylbenzimidazoles. Part II. Reaction of cyanomethylbenzimidazoles with aldehydes methylketones and nitroso compounds. Pol J Pharmacol Pharm. 1975, 27(2):187-201.
[12] Synthesis, structure activity relationship and anti-tubercular activity of novel pyrazoline derivatives. M.A. Ali, M. Shaharyar, A. A. Siddiqui, Eur. J. Med. Chem. 42 (2007) 268-275.
[13] Synthesis and in vitro antimycobacterial activity of N1-nicotinoyl-3-(4-- hydroxy-3--methyl phenyl)-5-((sub)phenyl)-2-pyrazoline. M. Shaharyar, A.A.Siddiqui, M.A. Ali, D. Shriram, P.Yogeeshwari, Bioorg. Med. Chem. Lett.16 (2006) 3947-3949.
[14] G.W.H. Cheeseman, J. Chem. Soc. (1964) 4645-46.
[15] Collins, L. and Franzblau, S. G. (1997) Microplate alamar blue assay versus BACTEC 460 system for high-throughput screening of compounds against Mycobacterium tuberculosis and Mycobacterium avium. Antimicrob. Agents Chemother., 41, 1004-1009.