| 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); R1 represents hydrogen, C1-C6 alkyl or C1-C6 alkyl substituted by one or more halogen atoms, or, except when Q is a radical of the formula: -N(OH)CH(=O), a hydroxy, C1-C6 alkoxy, C1-C6 alkenyloxy, amino, C1-C6 alkylamino, or di-(C1-C6 alkyl)amino group; R2 represents a substituted or unsubstituted C1-C6 alkyl, cycloalkyl(C1-C6 alkyl)- or aryl(C1-C6 alkyl)-group; and A represents a group of formula (IIA), or (IIB) wherein R4 represents the side chain of a natural or non-natural alpha amino acid, and R5 and R6 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. |