The compounds of the formula (II):
and salts and esters thereof wherein R1 is a pyrimidyl group, or a pyrimidyl group substituted by one or two lower alkyl groups, or by a lower alkoxy group or by a lower acyloxy group; and R2 is a hydrogen atom or a group CR3R4R5 wherein R3 is a hydrogen atom or a hydroxy group; R4 is a hydrogen atom or a lower alkyl group; and Rs is a hydrogen atom or a lower alkyl group, a benzyl group, a phenyl group or is joined to R4 to form part of a C5-7 carbocyclic ring, have been found to be antibacterial-agents. Their preparation and use is described.
其中 R1 是
嘧啶基,或被一个或两个低级烷基、低级烷氧基或低级酰氧基取代的
嘧啶基;R2 是氢原子或 CR3R4R5 基团,其中 R3 是氢原子或羟基;R4 是氢原子或低级烷基;Rs 是氢原子或低级烷基、苄基、苯基或与 R4 连接形成 C5-7 碳环的一部分,这些式 (II) 的化合物及其盐和酯已被发现是抗菌剂。 现对其制备和使用方法进行说明。