Abstract
The present study deals with the synthesis of novel spiro[azetidine-2,3′-indole]-2′,4(1′H)-dione derivative from the reactions of 3-(phenylimino)-1,3-dihydro-2H-indol-2-one derivatives with chloracetyl chloride in the presence of triethylamine (TEA). All the compounds were characterized using IR, 1H-NMR, MS, and elemental analysis. They were screened for their antibacterial and antifungal activities. The bacterial strains used were Gram-positive Staphylococcus aureus (MTCC-96) and Gram-negative Escherichia coli (MTCC-521) and Pseudomonas aeruginosa (MTCC-647). The antifungal screening was done on Candida albicans (MTCC-183) and Asperigillus niger (MTCC-343) fungal strains. Results revealed that, compounds (7a), (7b), (7c), (7d), and (7e) showed very good activity with MIC value of 6.25–12.5 μg/ml against three evaluated bacterial strains and the remaining compounds showed good to moderate activity comparable to standard drugs as antibacterial agents. Compounds (7c) and (7h) displayed equipotent antifungal activity in comparison to standard drugs. Amoxicillin, gentamycin, and streptomycin were used as standard drugs for antibacterial activity while fluconazole and itraconazole were used as standard drugs for antifungal activity. Structure–activity relationship study of the compounds showed that the presence of electron withdrawing group substitution at 5′ and 7′ positions of indoline ring and on ortho or para position of phenyl ring increases both antibacterial and antifungal activity of the compound. Henceforth, our findings will have a good impact on chemists and biochemists for further investigations in search of spiro-fused antimicrobial agents.
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The authors are grateful to the Head, Zydus Research Center, for providing 1H-NMR, mass spectral, elemental analysis and Ganpat University for providing financial support.
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Shah, R.J., Modi, N.R., Patel, M.J. et al. Design, synthesis and in vitro antibacterial and antifungal activities of some novel spiro[azetidine-2,3′-indole]-2,4(1′H)-dione. Med Chem Res 20, 587–594 (2011). https://doi.org/10.1007/s00044-010-9354-x
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DOI: https://doi.org/10.1007/s00044-010-9354-x