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The fluorinated quinolones.

M Kidwai1, P Misra, R Kumar

  • 1Department of Chemistry, University of Delhi, India.

Current Pharmaceutical Design
|April 10, 1999
PubMed
Summary
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Quinolone antibiotics, developed since 1962, target bacterial gyrase to inhibit DNA replication. Newer quinolone derivatives offer improved antimicrobial activity and pharmacokinetic properties, potentially reducing resistance in challenging infections.

Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Pharmacology

Background:

  • Nalidixic acid discovery in 1962 initiated quinolone development.
  • Fluorine at position-6 (1980s) enhanced activity against Gram-negative bacteria.
  • Subsequent modifications improved solubility, potency, and half-life.

Purpose of the Study:

  • To review structural modifications of quinolones.
  • To highlight advancements in antimicrobial activity and pharmacokinetics.
  • To discuss the mechanism of action and potential of new derivatives.

Main Methods:

  • Literature review of quinolone development and modifications.
  • Analysis of structure-activity relationships.
  • Discussion of the mechanism of action involving bacterial gyrase inhibition.

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Main Results:

  • Quinolone modifications have progressively enhanced antimicrobial spectrum and potency.
  • Key advancements include fluorine incorporation and improved pharmacokinetic profiles.
  • Newer quinolones aim for a balance of efficacy, safety, and reduced resistance potential.

Conclusions:

  • Quinolone derivatives demonstrate significant improvements in antimicrobial efficacy.
  • Inhibition of bacterial gyrase is the core mechanism of action.
  • Enhanced quinolones offer promise for treating infections caused by marginally sensitive organisms with reduced resistance risk.