Compounds of formula (II) have antibacterial activity: wherein Q represents a radical of formula —N(OH)CH(═0) or formula —C(═O)NH(OH); R
1
represents hydrogen, methyl or trifluoromethyl, or, except when Z is a radical of formula —N(OH)CH(═0), a hydroxy, halo or amino group; R
2
represents a group R
10
-(V)
n
-(ALK)
m
- wherein R
10
represents hydrogen, or an optionally substituted C
1
-C
6
alkyl, C
2
-C
6
alkenyl, C
2
-C
6
alkynyl, cycloalkyl, aryl, or heterocyclyl group, ALK represents a straight or branched divalent C
1
-C
6
alkylene, C
2
-C
6
alkenylene, or C2-C6 alkynylene radical, and may be interrupted by one or more non-adjacent —NH—, —O— or —S— linkages, V represents —NH—, —O— or —S—, m and n are independently 0 or 1; R
3
represents the side chain of a natural or non-natural alpha amino acid; R
4
represents hydrogen or C
1
-C
3
alkyl; Y represents N or CH; ring A is optionally substituted on one or more ring carbon atoms by C
1
-C
3
alkyl, C
1
-C
3
alkoxy, or halo; and R
5
represents a group (IIA): wherein m is 0 or 1; Alk
1
represents a divalent C
1
-C
3
alkylene radical; Z represents hydrogen or an optionally substituted cycloalkyl, phenyl or heterocyclic group.
公式(II)的化合物具有抗菌活性:其中Q代表公式—N(OH)CH(═0)或公式—C(═O)NH(OH)的基团;R1代表氢,甲基或三
氟甲基,或者除非Z是公式—N(OH)CH(═0)的基团,否则是一个羟基,卤素或
氨基基团;R2代表一个基团R10-(V)n-(ALK)m-,其中R10代表氢,或者是一个可选取代的C1-C6烷基,C2-C6烯基,C2-C6炔基,环烷基,芳基或杂环基,ALK代表一条直链或支链的双价C1-C6烷基,C2-C6烯基或C2-C6炔基基团,并且可以被一个或多个不相邻的—NH—,—O—或—S—键所中断,V代表—NH—,—O—或—S—,m和n独立地为0或1;R3代表天然或非天然的α
氨基酸的侧链;R4代表氢或C1-C3烷基;Y代表N或CH;环A在一个或多个环碳原子上可选地被C1-C3烷基,C1-C3烷氧基或卤素取代;R5代表一个基团(IIA):其中m为0或1;Alk1代表一个双价的C1-C3烷基基团;Z代表氢或一个可选取代的环烷基,苯基或杂环基。