Substituted piperazinyl-phenyl-oxazolidinone derivatives and their use as anti-bacterial agents

摘要

The invention concerns a compound of formula (I) wherein, for example: R<1> is of the formula -NHC(=O)R wherein R is for example (1-4C)alkyl; R<2> and R<3> are independently hydrogen or fluoro; R<4> and R<5> are independently hydrogen or methyl; R<6> is a 6-membered heteroaryl ring containing 2 or 3 ring nitrogen atoms as the only ring heteroatoms, and optionally substituted by substituents selected from (1-4C)alkyl (optionally substituted), halo, trifluoromethyl, (1-4C)alkylS(O)n- (wherein n is 0, 1 or 2), (1-4C)alkylS(O)2amino, (1-4C)alkanoylamino, carboxy, hydroxy, amino, (1-4C)alkylamino, di-(1-4C)alkylamino, (1-4C)alkoxycarbonyl, carbamoyl, N-(1-4C)alkylcarbamoyl, di-(N-(1-4C)alkyl)carbamoyl [wherein the (1-4C)alkyl group or groups in the last two-mentioned carbamoyl substituents is optionally substituted by hydroxy, (1-4C)alkoxy or (1-4C)alkoxycarbonyl], (2-4C)alkenyl (optionally substituted by carboxy or (1-4C)alkoxycarbonyl), (1-4C)alkoxy, cyano or nitro; pharmaceutically-acceptable salts, suitable N-oxides and in-vivo-hydrolysable esters thereof; processes for their preparation; pharmaceutical compositions containing them and their use as antibacterial agents.