Structural modification of ciprofloxacin and norfloxacin for searching new antibiotics to combat drug-resistant bacteria
Keywords:fluoroquinolones, ciprofloxacin, norfloxacin, synthesis, antibiotic resistance, molecular docking, antibacterial activity
The aim of the work. Among all the representatives of four generations of fluoroquinolones ciprofloxacin (CIPRO) and norfloxacin (NOR) remain widely used and prescribed antibiotics in clinical practice. However, the problem of resistance towards them is gradually increasing. Thus, our investigation is dedicated to chemical modification of C-7 position of Ciprofloxacin and Norfloxacin ring as a promising solution to combat antibiotic resistance and open a pathway towards convenient synthesis of new fluoroquinolones derivatives.
Materials and methods. The subjects of the research were N-piperazine-substituted ciprofloxacin and norfloxacin. The methods of molecular docking and organic synthesis were applied in the study. The structures of the obtained compounds were confirmed by 1H NMR, 13C NMR, 19F NMR, LC/MS, IR, UV spectroscopy. The antimicrobial activity was measured by the method of double serial dilutions against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Bacillus subtilis (ATCC 6633), Pseudomonas aeruginosa (ATCC 27853), Candida albicans (NCTC 885-653) and diffusion in agar method against clinical strains.
The results. 7-(4-(2-Cyanoacetyl)piperazin-1-yl)-1-R-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acids were synthesized and their structures were confirmed. The obtained compounds showed the antibacterial activity on the reference level for double dilution method and exceeded control for “well” method.
Conclusions. The current investigation revealed the promising route for the expanding of the existing fluoroquinolones diversity. Pharmacodynamics and pharmacokinetics changes could be achieved by chemical modifications of C-7 position of the initial ring. Further research utilizing the obtained compounds as starting ones opens a promising way to novel active molecules synthesis and combating the problem of antibiotic resistance
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Copyright (c) 2021 Halyna Hryhoriv, Illia Mariutsa, Sergiy M. Kovalenko, Lyudmila Sidorenko, Lina Perekhoda, Nataliia Filimonova, Olga Geyderikh, Victoriya Georgiyants
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