Novel cephalosporins of the formula, ##STR1## wherein R is a hydrogen atom or an alkyl, aryl or thienyl group, and R' is a group which constitutes together with the adjacent nitrogen atom a 5- or 6-membered ring containing 1 or 2 nitrogen atoms, which are effective particularly against Pseudomonas aeruginosa as well as against other Gram negative and positive microorganisms, for example, N-[7-(.alpha.-sulfophenylacetamido)ceph-3-em-3-ylmethyl] pyridinium 4-carboxylate, N-[7-(.alpha.-sulfo-3'-thienylacetamido)ceph-3-em-3-ylmethyl] pyridinium-4-carboxylate, and their pharmaceutically acceptable salts thereof. Sodium salt of the former is prepared by, e.g. reacting sodium 7-(.alpha.-sulfophenylacetamido) cephalosporanate with pyridine in water.
该式的新型
头孢菌素,其中R是氢原子或烷基,芳基或
噻吩基,R'是一个与相邻的氮原子一起构成含有1或2个氮原子的5-或6-成员环的基团,特别有效地对抗
铜绿假单胞菌以及其他革兰氏阴性和阳性微
生物,例如N-[7-(α-磺酰苯乙酰
氨基)头孢-3-酰基-3-乙基]
吡啶铵-4-
羧酸盐,N-[7-(α-磺酰-3'-
噻吩乙酰
氨基)头孢-3-酰基-3-乙基]
吡啶铵-4-
羧酸盐及其药学上可接受的盐。前者的钠盐可通过在
水中反应
钠7-(α-磺酰苯乙酰
氨基)头孢烷酸盐与
吡啶制备。