The present invention relates to novel cephalosporin compounds, pharmaceutically acceptable non-toxic salts, physiologically hydrolyzable esters, hydrates and solvates and isomers thereof which possess potent and broad antibacterial activities. The compounds of the present invention have a (4-amino-1-substituted-alkapyrimidinium-4-yl)thiomethyl group in 3-position of the cephem nucleus and is specifically represented by the following formula(I): ##STR1## wherein: R.sup.1 is a hydrogen atom or a C.sub.1-4 alkyl, C.sub.2-4 alkenyl, C.sub.2-4 alkynyl or --C(R.sup.A)(R.sup.B)COOH group wherein R.sup.A and R.sup.B are independently a hydrogen atom or a C.sub.1-4 alkyl group, or form a C.sub.3-7 cycloalkyl group together with the carbon atom to which they are attached; R.sup.2 is an unsubstituted or substituted amino, C.sub.1-4 alkyl or C.sub.3-7 cycloalkyl group; and n is an integer ranging from 2 to 7.
本发明涉及新的
头孢菌素化合物、药学上可接受的无毒盐、生理上
水解的酯、
水合物、溶剂合物及其同分异构体,具有强大而广泛的抗菌活性。本发明的化合物在
头孢菌素核的3位具有(4-
氨基-1-取代-烷基
嘧啶-4-基)
硫甲基基团,具体表示如下式(I):其中:R^1是氢原子或C.sub.1-4烷基、C.sub.2-4烯基、C.sub.2-4炔基或--C(R^A)(R^B)COOH基团,其中R^A和R^B独立地是氢原子或C.sub.1-4烷基,或者与它们连接的碳原子一起形成C.sub.3-7环烷基基团;R^2是未取代或取代的
氨基、C.sub.1-4烷基或C.sub.3-7环烷基基团;n是一个范围从2到7的整数。