| 摘要 |
Cephalosporin derivatives of the formula <IMAGE> in which m represents 0, 1 or 2, R<1> represents hydrogen or an acyl group, R<2> represents hydrogen, lower alkoxy, amino, lower alkylthio or lower alkanoylamino, R<3><1> represents hydrogen, lower alkyl, lower alkenyl, C3-C7-cycloalkyl, halogen-lower alkyl or halophenyl; Z represents R<3><0>-C or nitrogen, R<3><0> represents hydrogen or halogen, or R<3><0> and R<3><1> together represent a C3-C5-alkylene group, a C2-C4-alkylene- monooxy group or a C1-C2-alkylenedioxy group, R<3><2> represents hydrogen, halogen, lower alkyl or an optionally substituted 5- or 6-membered heterocyclic ring having one, two or three oxygen, nitrogen and/or sulphur atoms and R<3><3> represents hydrogen or halogen or R<3><2> and R<3><3> together represent a C1-C4-alkylenedioxy group, and easily hydrolysable esters and salts of these compounds and hydrates of the compounds of the formula I or of their esters and salts are described. The products have antimicrobial activity. |
