Novel alkyloximes of 7-amino-thiazolyl-acetamidocephalosporanic acids of the formula ##STR1## wherein R is selected from the group consisting of alkyl of 1 to 5 carbon atoms, cycloalkyl of 3 to 5 carbon atoms and --CH.sub.2 --SR', R' is selected from the group consisting of acyl of an alkanoic acid of 2 to 4 carbon atoms, 1-methyl-tetrazolyl and 2-methyl-1,3,4-thiadiazolyl, R.sub.1 is selected from the group consisting of hydrogen and a group easily removeable by acid hydrolysis or hydrogenolysis, R.sub.2 is selected from the group consisting of alkyl of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms, A is selected from the group consisting of hydrogen, an alkali metal cation, an equivalent of an alkaline earth metal or magnesium, an organic amine base cation and an ester group easily removeable by acid hydrolysis or hydrogenolysis with the proviso that when R.sub.1 is hydrogen, A is not an ester group easily removeable by hydrogenolysis or acid hydrolysis and the wavy line means that OR.sub.2 is in one or the other of the two possible syn or anti isomeric positions having a very good antibiotic activity and novel processes and intermediates for their preparation.
新型7-
氨基
噻唑基乙酰胺
头孢菌素酸的烷氧
肟酸盐,其通式如上所示,其中R选自1至5个碳原子的烷基、3至5个碳原子的环烷基和—
CH2—SR',R'选自2至4个碳原子的链烷酸的酰基、1-
甲基四唑基和
2-甲基-1,3,4-噻二唑基,R1选自氢和易被酸
水解或氢解去除的基团,R2选自1至4个碳原子的烷基、2至4个碳原子的烯基和炔基,A选自氢、碱
金属阳离子、碱土
金属或
镁的等价物、有机胺碱阳离子和易被酸
水解或氢解去除的酯基,但当R1为氢时,A不是易被氢解或酸
水解去除的酯基,波浪线表示OR2处于两种可能的顺式或反式异构位置之一,具有非常好的抗生素活性,以及制备它们的新方法和中间体。