Abstract
Progression of drug resistance among bacterial and fungal pathogens justifies the development of novel antimicrobial agents. Thus, a series of novel sulphamethoxazole-based ureas and imidazolidine-2,4,5-triones have been designed and synthesised. The urea derivatives were obtained by the reaction of sulphamethoxazole and isocyanates, and their cyclisation to imidazolidine-2,4,5-triones was performed via oxalyl chloride. All synthesised derivatives were evaluated in vitro to determine their activity against gram-positive and gram-negative bacteria, fungi, Mycobacterium tuberculosis, and atypical mycobacteria and their cytotoxicity. The growth of mycobacteria was inhibited within the range of 4–1000 µM and M. tuberculosis was the least-susceptible strain. 4-(3-Heptylureido)-N-(5-methylisoxazol-3-yl)benzenesulphonamide was identified as the most promising compound because it exhibited the highest activity against atypical mycobacteria at minimum inhibitory concentrations, from 4 µM, and with acceptable toxicity (selectivity indices for M. avium and M. kansasii higher than 16 and 62.5, respectively). Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus, were inhibited at concentrations starting from 125 µM, whereas the investigated derivatives exhibited almost no antifungal potency and activity against gram-negative species.
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Krátký, M., Mandíková, J., Trejtnar, F. et al. Synthesis and antimicrobial activity of sulphamethoxazole-based ureas and imidazolidine-2,4,5-triones. Chem. Pap. 69, 1108–1117 (2015). https://doi.org/10.1515/chempap-2015-0109
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DOI: https://doi.org/10.1515/chempap-2015-0109