Identification of a Novel Oxazolidinone (U-100480) with Potent Antimycobacterial Activity
作者:Michael R. Barbachyn、Douglas K. Hutchinson、Steven J. Brickner、Michael H. Cynamon、James O. Kilburn、Sally P. Klemens、Suzanne E. Glickman、Kevin C. Grega、Susan K. Hendges、Dana S. Toops、Charles W. Ford、Gary E. Zurenko
DOI:10.1021/jm950956y
日期:1996.1.1
During the course of our investigations in the oxazolidinone antibacterial agent area, we have identified a subclass with especially potent in vitro activity against mycobacteria. The salient structural feature of these oxazolidinone analogues, 6 (U-100480), 7 (U-101603), and 8 (U-101244), is their appended thiomorpholine moiety. The rational design, synthesis, and evaluation of the in vitro antimycobacterial activity of these analogues is described. Potent activity against a screening strain of Mycobacterium tuberculosis was demonstrated by 6 and 7 (minimum inhibitory concentrations or MIC's less than or equal to 0.125 mu g/mL). Oxazolidinones 6 and 8 exhibit MIC(90) values of 0.50 mu g/mL or less against a panel of organisms consisting of five drug-sensitive and five multidrug-resistant strains of M. tuberculosis, with 6 being the most active congener. Potent in vitro activity against other mycobacterial species was also demonstrated by 6. For example, 6 exhibited excellent in vitro activity against multiple clinical isolates of Mycobacterium avium complex (MIC's = 0.5-4 mu g/mL). Orally administered 6 displays in vivo efficacy against M. tuberculosis and M. avium similar to that of clinical comparators isoniazid and azithromycin, respectively. Consideration of these factors, along with a favorable pharmacokinetic and chronic toxicity profile in rats, suggests that 6 (U-100480) is a promising antimycobacterial agent.