This invention relates to novel cephalosporin derivatives of the formula
wherein
R¹ is hydrogen, a straight, branched, or cyclic lower alkyl group having up to six carbon atoms or a radical of the formula
in which R³ and R⁴ are each 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 5 carbon atoms;
R² is a radical selected from the group consisting of
wherein R⁵ is hydrogen or acetyl; R⁶, R⁷ and R⁸ each are independently C₁₋₅ alkyl; n is 1 or 2; and y is 1 to 5.
In another aspect, this invention relates to compounds of formula I and their nontoxic pharmaeutically acceptable salts, physiologically hydrolyzable esters or solvates.
Representative compounds of this invention were selected for testing and were shown to display potent antibacterial activity.
本发明涉及式如下的新型
头孢菌素衍
生物
式中
R¹为氢、具有最多六个碳原子的直链、支链或环状低级烷基或式中的一个基团
其中 R³ 和 R⁴ 各自独立地为氢、甲基或乙基,或 R³ 和 R⁴ 连同其所连接的碳原子可为含有 3 至 5 个碳原子的亚环烷基环;
R² 是选自以下组成的基团
其中 R⁵ 是氢或乙酰基;R⁶、R⁷ 和 R⁸ 各自独立地是 C₁₋₅ 烷基;n 是 1 或 2;以及 y 是 1 至 5。
在另一方面,本发明涉及式 I 化合物及其无毒的药物学上可接受的盐、生理上可
水解的酯或溶液。
本发明选择了具有代表性的化合物进行测试,结果表明这些化合物具有很强的抗菌活性。