Derivatives of substituted cephalosporanic acid represented by the formula (I):
wherein R1 represents a 4-pyridylthiomethyl, alpha-aminobenzyl, cyanomethyl or 1-tetrazolylmethyl group; R2 represents a hydrogen atom or an acetoxy or (5-methyl-1,3,4-thiadiazol-2-yl)thio group; R3 represents a hydrogen atom, a hydroxyl group, a carbamoyl group, an alkyl group having 1 to 4 carbon atoms or-(CONH)m(CH2)n-COOH wherein m is 0 or 1, n is 0, 1 or 2 and the carboxyl group may have been converted to a salt or an ester thereof; p is 0, 1 or 2; and X represents a carbon atom or nitrogen atom; are useful as antibiotics.
由式(I)代表的取代
头孢菌素酸的衍
生物:
其中 R1 代表 4-
吡啶硫甲基、α-
氨基苄基、
氰甲基或 1-
四唑甲基;R2 代表氢原子或乙酰氧基或(5-甲基-1,3,4-
噻二唑-2-基)
硫基;R3 代表氢原子、羟基、
氨基甲酰基、具有 1 至 4 个碳原子的烷基或-(CONH)m(
CH2)n-COOH,其中 m 为 0 或 1,n 为 0、1 或 2,羧基可能已转化为盐或其酯;p 为 0、1 或 2;X 代表碳原子或氮原子;可用作抗生素。