This invention relates to new cephem and cepham compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or a protected amino, R.sup.2 is hydrogen, acyl, aryl which may be substituted with suitable substituent(s), lower alkyl substituted with suitable substituent(s), lower alkenyl, lower alkynyl, cycloalkyl which may be substituted with suitable substituent(s), cyclo(lower)alkenyl, or S or O containing 5-membered heterocyclic group substituted with oxo group(s), R.sup.3 is hydrogen or lower alkyl, R.sup.4 is hydrogen, acyloxy(lower)alkyl; acylthio(lower) alkyl; pyridinium(lower)alkyl which may be substituted with suitable substituent(s); a heterocyclicthio(lower)alkyl which may be substituted with suitable substituent(s); lower alkyl;l halogen; hydroxy; thiazolium(lower)alkyl which may be substituted with suitable substituent(s); or lower alkoxy; R.sup.5 is carboxy or a protected carboxy, wherein R.sup.5 is COO.sup.- when R.sup.4 is pyridinium(lower)alkyl which may be substituted with suitable substituent(s) or thiazolium(lower)alkyl which may be substituted with suitable substituent(s), and the heavy solid line means single or double bond; and pharmaceutically acceptable salt thereof.
该发明涉及一种具有高抗微
生物活性的新
头孢菌素和
头孢菌素化合物,其
化学式如下:##STR1##其中R.sup.1是
氨基或受保护的
氨基,R.sup.2是氢、酰基、芳基(可能被适当取代的),受适当取代的低烷基取代的芳基,受适当取代的低烯基、低炔基、环烷基(可能被适当取代的),环(低)烯基,或含有氧或
硫的5-成员杂环基,其被氧代基取代,R.sup.3是氢或低烷基,R.sup.4是氢、酰氧(低)烷基;酰
硫(低)烷基;
吡啶(低)烷基,其可能被适当取代,杂环
硫(低)烷基,其可能被适当取代,低烷基;卤素;羟基;
噻唑(低)烷基,其可能被适当取代;或低烷氧基;R.sup.5是羧基或受保护的羧基,当R.sup.4是
吡啶(低)烷基,其可能被适当取代,或
噻唑(低)烷基,其可能被适当取代时,R.sup.5为COO.sup.-;重实线表示单键或双键;及其药用盐。