This invention provides novel cephalosporanic acids and esters thereof having the general formula
wherein R² is hydrogen, or lower acyl, R³ is hydrogen, or lower alkanoyloxy, and
R⁴ is hydrogen, 5-methyl-2-oxo-1,3-dioxolen-4-ylmelthyl, 1-(ethoxycarbonyloxy)ethyl,1-(pivaloyloxy)ethyl, 1-(cyclohexylacetoxy)ethyl, or 1-(cyclohexyloxycarbonyloxy) ethyl. These compounds, especially esters, are useful as broad spectrum antibiotics in the treatment and prevention of infectious diseases of mammals, and for other purposes known in the art. The acids (R⁴ is hydrogen) are useful as intermediates for making the esters.
本发明提供了通式如下的新型头孢烷酸及其
酯类
其中 R² 是氢或低级酰基,R³ 是氢或低级烷酰氧基,以及
R⁴是氢、5-甲基-2-氧代-1,3-二氧
戊烯-4-基巯基、1-(乙氧基羰基氧基)乙基、1-(新戊酰氧基)乙基、1-(环己基乙酰氧基)乙基或 1-(环己基氧基羰基氧基)乙基。这些化合物,尤其是
酯类,可作为广谱抗生素用于治疗和预防哺乳动物的传染性疾病,也可用于本领域已知的其他用途。酸(R⁴ 为氢)可用作制造酯的中间体。