| 摘要 |
The invention concerns compounds of formula (I), wherein: A is a 5-membered heteroaryl ring, a bicyclic benzo system containing such a 5-membered heteroaryl ring or a bicyclic or tricyclic heteroaryl ring system with at least one bridgehead nitrogen and optionally a further 1-3 heteroatoms chosen from oxygen, sulfur and nitrogen; R<1> is, for example, hydroxy, halo, amino, nitro, cyano, carboxy, thiol, C1-4alkanoyloxy, C1-4alkoxycarbonyl, dimethylaminomethyleneaminocarbonyl, C1-4alkyl, C2-4alkenyl, C2-4alkynyl, C1-4alkoxy, optionally substituted phenyl, an optionally substituted 5- or 6-membered heteroaryl ring or hydroxyC1-4alkyl; n is 0-6; R<2> and R<3> are independently hydrogen of fluoro; R<4> is, for example, C1-4alkyl; pharmaceutically acceptable salts and in vivo hydrolysable ester thereof; processes for their preparation; pharmaceutical compositions containing them and their use as antibacterial agents.
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