This invention relates to novel antibiotic cephalosporin derivatives of the formula
wherein
R¹ is hydrogen, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, or a radical of the formula
in which R³ and R⁴ are independently hydrogen, methyl or ethyl, or R³ and R⁴, taken together with the carbon atom to which they are attached, may be a cycloalkylidene ring containing from 3 to 6 carbon atoms;
R² is a radical of the formula
wherein R⁵ is hydrogen or C₁₋₆ alkyl.
This invention further relates to compounds of formula I and their pharmaceutically acceptable salts, physiologically hydrolyzable esters or solvates.
本发明涉及新型抗生素
头孢菌素衍
生物,其式为
其中
R¹ 是氢、C₁₋₆ 烷基、C₃₋₆ 环烷基或式中的基团
其中 R³ 和 R⁴ 独立地为氢、甲基或乙基,或 R³ 和 R⁴ 连同它们所连接的碳原子可以是含有 3 至 6 个碳原子的亚环烷基环;
R² 是式中的一个基团
其中 R⁵ 是氢或 C₁₋₆ 烷基。
本发明还涉及式 I 化合物及其药学上可接受的盐、生理上可
水解的酯或溶液。