This invention relates to novel cephalosporin derivatives of the formula ##STR1## wherein R.sup.1 is hydrogen, a straight, branched, or cyclic lower alkyl group having up to six carbon atoms or a radical of the formula ##STR2## in which R.sup.3 and R.sup.4 are each independently hydrogen, methyl or ethyl, or R.sup.3 and R.sup.4, taken together with the carbon atom to which they are attached, may be a cycloalkylidene ring containing from 3 to 5 carbon atoms; R.sup.2 is a radical selected from the group consisting of ##STR3## wherein R.sup.5 is hydrogen or acetyl; R.sup.6, R.sup.7 and R.sup.8 each are independently C.sub.1-5 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.
本发明涉及一种新型
头孢菌素衍
生物,其
化学式为##STR1##其中R.sup.1为氢,直链、支链或环状低碳原子烷基,碳原子数最多为6,或者为式子##STR2##中的基团,其中R.sup.3和R.sup.4各自独立地为氢、甲基或乙基,或者R.sup.3和R.sup.4与它们所连接的碳原子一起,可以是含有3到5个碳原子的环状烷基;R.sup.2是从##STR3##所选的基团,其中R.sup.5为氢或乙酰基;R.sup.6、R.sup.7和R.sup.8各自独立地为C.sub.1-5烷基;n为1或2;y为1到5。在另一个方面,本发明涉及化合物I及其无毒的药学上可接受的盐、生理
水解酯或溶剂化合物。本发明的代表性化合物经过测试显示出强大的抗菌活性。