Cephem and Cepham compounds of the formula:
wherein
R1 is amino or a protected amino,
R2 is hydrogen or certain substituent.
R3 is hydrogen or lower alkyl,
R4 is hydrogen or certain substituent,
Rs is carboxy or a protected carboxy
and the heavy solid line means single or double-bond and pharmaceutically acceptable salt thereof and processes for their preparation, and also an antibacterial composition comprising, as an effective ingredient, the above compound in association with a pharmaceutically acceptable, substantially nontoxic carrier or excipient. The invention also relates to the starting compounds
and their preparation.
式中的 Cephem 和 Cepham 化合物:
式中
R1 是
氨基或受保护的
氨基、
R2 是
氢或某些取代基
R3 是
氢或低级烷基、
R4 是
氢或某些取代基、
Rs 是羧基或受保护的羧基
重实线表示单键或双键及其药学上可接受的盐和它们的制备工艺,以及一种抗菌组合物,其有效成分包括上述化合物与药学上可接受的、基本上无毒的载体或赋形剂。本发明还涉及起始化合物
及其制备。