Cephalosporin compounds of general formula
(wherein R' represents a hydrogen atom or a carboxyl blocking group, R2 represents an amino or protected amino group, X represents a halogen atom or a hydroxyl or acetoxy group, B is S or S - O, and the dotted line bridging the 2-, 3- and 4-positions indicates that the compound is a ceph-2-em or ceph-3-em compound) and salts thereof. The compounds may be useful in the preparation of other cephalosporin compounds possessing antibiotic activity. Futhermore, ceph-3-em compounds of formula (1) in which R2 is an amino group, B is S and X is hydroxy or acetoxy, as well as the non-toxic salts and non-toxic metabolically labile esters thereof, themselves exhibit antibiotic activity.
通式如下的
头孢菌素化合物
(其中 R' 代表
氢原子或羧基,R2 代表
氨基或受保护的
氨基,X 代表卤素原子或羟基或乙酰
氧基,B 为 S 或 S - O,连接 2、3、4 位的虚线表示该化合物为头孢-2-em 或头孢-3-em 化合物)及其盐类。这些化合物可用于制备其他具有
抗生素活性的
头孢菌素化合物。此外,式(1)中 R2 为
氨基,B 为 S,X 为羟基或乙酰
氧基的头孢-3-em 化合物及其无毒盐和无毒代谢易变
酯本身也具有
抗生素活性。