Conformational Constraint in Oxazolidinone Antibacterials. Synthesis and Structure−Activity Studies of (Azabicyclo[3.1.0]hexylphenyl)oxazolidinones

Adam R. Renslo,* Priyadarshini Jaishankar, Revathy Venkatachalam, Corinne Hackbarth, Sara Lopez, Dinesh V. Patel, and Mikhail F. Gordeev*
Discovery Research, Vicuron Pharmaceuticals, 34790 Ardentech Ct, Fremont, California 94555
J. Med. Chem., 2005, 48 (15), pp 5009–5024
DOI: 10.1021/jm058204j
Publication Date (Web): June 22, 2005
Copyright © 2005 American Chemical Society
*

 To whom correspondence should be addressed. A.R.:  tel, 510-739-3023; e-mail, arenslo@vicuron.com. M.G.:  tel, 510-739-3013; e-mail, mgordeev@vicuron.com.

Abstract

Abstract Image

The oxazolidinones are a new class of synthetic antibacterials effective against a broad range of pathogenic Gram-positive bacteria, including multi-drug-resistant strains. Linezolid is the first drug from this class to reach the market and has become an important new option for the treatment of serious infections, particularly those caused by methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enteroccocus faecium (VRE). In the search for novel oxazolidinones with improved potency and spectrum, we have prepared and evaluated the antibacterial properties of conformationally constrained analogues in which the morpholine ring of linezolid is replaced with various substituted azabicyclo[3.1.0]hexyl ring systems. Several classes of azabicyclic analogues were identified with activity comparable or superior to that of linezolid. These include analogues bearing hydroxyl, amino, amido, or carboxyl groups on the azabicyclic ring. The azabicyclic acid analogue 50 was 4 times more potent than linezolid against key Gram-positive and fastidious Gram-negative pathogens (S. aureus, Streptococcus pneumoniae, and E. faecalis MICs ≤ 1 μg/mL; Haemophilus influenzae MIC = 4 μg/mL).

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History

  • Published In Issue July 28, 2005
  • Received March 4, 2005

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