| abstract |
A compound of structural formula (I) or pharmaceutically acceptable salts thereof wherein: X is O, S, SO, SO2, SNR<10> or S(O)NR<10>; R is (a) hydrogen, (b) C1-C8 alkyl optionally substituted with one or more of the following: F, Cl, hydroxy, C1-C8alkoxy, C1-C8acyloxy or -O-CH2-Ph, (c) C3-C6cycloalkyl, (d) amino, (e) C1-C8alkylamino, (f) C1-C8dialkylamino or (g) C1-C8alkoxy; R<1> is H, except when X is O, then R<1> can be H, CH3, CN, CO2H, CO2R or (CH2)mR<11> (m is 1 or 2); R<2> is independently H, F or Cl; R<3> is H except when X is O and R<1> is CH3, then R<3> can be H or CH3; R<10> is independently H, C1-C4alkyl (optionally substituted with chloro, fluoro, hydroxy, C1-C8alkoxy, amino, C1-C8alkylamino, or C1-C8dialkylamino) or p-toluenesulfonyl; R<11> is hydrogen, OH, OR, OCOR, NH2, NHCOR or N(R<10>)2; and n is 0, 1 or 2. The oxazine and thiazine oxazolidinone derivatives are useful antimicrobial agents, effective against a number of human and veterinary pathogens, including gram-positive aerobic bacteria such as multiply-resistant staphylococci, streptococci and enterococci as well as anaerobic organisms such as Bacteroides spp. and Clostridia spp. species, and acid-fast organisms such as Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium spp.. |