The screening of an in-house quinolones library against Mycobacterium tuberculosis (Mtb) H37Rv, followed by a first cycle of optimization, yielded 6-hydrogen-8-methyl derivatives endowed with good potency. The antitubercular activity also encompassed the bacteria in a non-replicating state (NRP-TB) with minimum inhibitory concentration values lower than those of the reference agent, moxifloxacin. Among the best compounds, 11w and 11ai, characterized by a properly substituted piperidine at the C-7 position, were active against single-drug-resistant (SDR-TB) Mtb strains, maintaining overall good potency also against ciprofloxacin-resistant Mtb. This study expands the body of SAR around antitubercular quinolones leading to reconsider the role played by the usual fluorine atom at the C-6 position. Further elaboration of the 6-hydrogen-8-methylquinolone scaffold, with a particular focus on the C-7 position, is expected to give even more potent congeners holding promise for shortening the current anti-TB regimen. © 2012 John Wiley & Sons A/S.
6-Hydrogen-8-Methylquinolones Active Against Replicating and Non-replicating Mycobacterium tuberculosis / Tabarrini, Oriana; Sabatini, Stefano; Massari, Serena; Pieroni, Marco; Franzblau, Scott G.; Cecchetti, Violetta. - In: CHEMICAL BIOLOGY & DRUG DESIGN. - ISSN 1747-0277. - 80:5(2012), pp. 781-786. [10.1111/cbdd.12022]
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