| abstract |
Compounds of formula (II) are antibacterial agents wherein Q represents a radical of the formula: —N(OH)CH(═O) or the formula: —C(═O)NH(OH); R 1 represents hydrogen, C 1 -C 6 alkyl or C 1 -C 6 alkyl substituted by one or more halogen atoms, or, except when Q is a radical of the formula: —N(OH)CH(═O), a hydroxy, C 1 -C 6 alkoxy, C 1 -C 4 alkenyloxy, amino, C 1 -C 4 alkylamino, or di-(C 1 -C 6 alkyl)amino group; R 2 represents a substituted or unsubstituted C 1 -C 6 alkyl, cycloalkyl(C 1 -C 6 alkyl)- or aryl(C 1 -C 6 alkyl)-group; and A represents a group of formula (IIA), or (IIB) wherein R 4 represents the side chain of a natural or non-natural alpha amino acid, and R 5 and R 6 when taken together with the nitrogen atom to which they are attached form a saturated heterocyclic first ring of 5 to 7 atoms as specified in the description. |