A series of 7-aminothiadiazolylcephalosporins having a 1-(substituted)-1H-imidazo[4, 5-b]pyridinium group at the C-3' position of the cephem nucleus were synthesized and evaluated for in vitro antibacterial activities. Among the cephalosporins prepared in this study, 7β-[2-(5-amino-1, 2, 4-thiadiazol-3-yl)-2(Z)-ethoxyiminoacetamido]-3-[1-(3-methylaminopropyl)-1H-imidazo[4, 5-b]pyridinium-4-yl]methyl-3-cephem-4-carboxylate sulfate (S-3578) showed extremely potent broad spectrum activity against both Gram-positive bacteria including methicillin-resistant Staphylococcus aureus (MRSA) and Gram-negative bacteria including Pseudomonas aeruginosa, and good water solubility.
一系列具有1-(取代基)-
1H-咪唑[4, 5-b]
吡啶铵基团的7-
氨基
噻二唑基
头孢菌素在头孢核的C-3'位点合成并评估其体外抗菌活性。在本研究中制备的
头孢菌素中,7β-[2-(5-amino-1, 2, 4-thiadiazol-3-yl)-2(Z)-ethoxyiminoacetamido]-3-[1-(3-methylaminopropyl)-1H-imidazo[4, 5-b]pyridinium-4-yl]methyl-3-头孢-4-
羧酸盐
硫酸盐(S-3578)对革兰氏阳性细菌(包括抗
甲氧西林的
金黄色葡萄球菌MRSA)和革兰氏阴性细菌(包括
铜绿色假单胞菌)表现出极强的广谱活性,并且具有良好的
水溶性。