European Journal of Chemistry

Synthesis and in-vitro antibacterial activity of some bis-5-(thiophen-2-yl)-carbothioamide-pyrazoline derivatives



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Mamta Rani
Mohamad Yusuf

Abstract

Five new compounds, bis-pyrazoline derivatives (2a-e) with antibacterial properties, built around the alkyl chains of varying lengths were prepared via reaction of various 1-ω-alkoxy-bis-chalcones with N-substituted thiosemicarbazide in ethanolic NaOH solution. The antibacterial activity of these compounds were evaluated by the disk diffusion method against two Gram-positive and two Gram-negative bacteria and the minimum inhibitory concentration were determined. The structures of these compounds were elucidated by IR, 1H-NMR, 13C-NMR, ESI mass spectrometry and their purities were also confirmed by elemental analyses. The formation and stereochemical features of the compounds, 2a-e, are found to be independent of the internal spacer length. The results showed that compounds 2a and 2e are better antibacterial agent compared to Gentamicin and Tetracycline.

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Rani, M.; Yusuf, M. Synthesis and in-Vitro Antibacterial Activity of Some Bis-5-(thiophen-2-Yl)-Carbothioamide-Pyrazoline Derivatives. Eur. J. Chem. 2012, 3, 406-410.

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