6-Hydrogen-8-Methylquinolones Active Against Replicating and Non-replicating Mycobacterium tuberculosis

Authors

  • Oriana Tabarrini,

    Corresponding author
    1. Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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  • Stefano Sabatini,

    1. Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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  • Serena Massari,

    1. Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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  • Marco Pieroni,

    1. Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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    • Present address: Dipartimento Farmaceutico, Via GP Usberti 27/A-Campus Universitario Università di Parma, Parma, Italy.

  • Scott G. Franzblau,

    1. Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood St., Chicago, IL 60612, USA
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  • Violetta Cecchetti

    1. Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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Corresponding author: Oriana Tabarrini,oriana.tabarrini@unipg.it

Abstract

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.

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