A compound of formula (I) or a salt thereof:
wherein R' is an amino group, an azido group, or an acylamino group as found in antibacterially active penicillins or cephalosporins;
R2 is a hydrogen atom or a C1-4 alkyl group;
R3 is a hydrogen atom, or a C1-4 alkyl group optionally substituted by a carboxyl, carboxylic ester, hydroxy, C1-4 alkyloxy, acyloxy or heterocyclylthio group; and
R4 is hydrogen or a readily removable carboxyl protecting group.
The compounds wherein R1 is an acylamino group are found in known antibacterially active penicillins and cephalosporins and wherein R4 is a hydrogen, a pharmaceutically acceptable salting ion or an in vivo hydrolysable ester forming radical may be formulated in pharmaceutical compositions.
Processes for the preparation of the compound (I) are also described.
式 (I) 的化合物或其盐:
其中 R' 是
氨基、
叠氮基或酰
氨基,如抗菌活性
青霉素或
头孢菌素中的酰
氨基;
R2 是氢原子或 C1-4 烷基;
R3 是氢原子或任选被羧基、
羧酸酯、羟基、C1-4 烷氧基、酰氧基或杂环
硫基取代的 C1-4 烷基;以及
R4 是氢或易于去除的羧基保护基团。
R1为酰
氨基的化合物存在于已知的具有抗菌活性的
青霉素和
头孢菌素中,R4为氢、药学上可接受的盐离子或体内可
水解的酯形成基的化合物可配制成药物组合物。
此外,还描述了制备化合物 (I) 的工艺。