Semisynthetic .BETA.-lactam antibiotics. IX. Synthesis and antibacterial activity of 7-(2-(2-aminothiazol-4-yl)-2-sulfoacetamido)cephalosporanic acid and its derivatives.
作者:ISAO MINAMI、HIROSHI AKIMOTO、MASAHIRO KONDO、HIROAKI NOMURA
DOI:10.1248/cpb.31.482
日期:——
Novel 2-(2-aminothiazol-4-yl)-2-sulfoacetyl cephalosporins (10a-c) were synthesized by two routes : A, acylation of 7-aminocephalosporanic acid (8a) or its analogs (8b, c) with an active derivative of 2-(2-aminothiazol-4-yl)-2-sulfoacetic acid, and B, side chain sulfonation of γ-chloroacetoacetyl cephalosporins (13a, b) with SO3-dioxane and subsequent thiazole ring formation by treatment with thiourea. The cephalosporin with 4-carbamoylpyridiniomethyl at the 3-position (10c) showed a potent antipseudomonal activity but had poor activity against other gram-negative bacteria, while the cephalosporin with 1-methyltetrazol-5-ylthiomethyl at the 3-position (10b) showed a broad spectrum but caused no inhibition of Pseudomonas aeruginosa.
新型2-(2-氨基噻唑-4-基)-2-磺酸乙酰头孢菌素(10a-c)通过两条路线合成:A,使用2-(2-氨基噻唑-4-基)-2-磺酸乙酸的活性衍生物对7-氨基头孢酸(8a)或其类似物(8b,c)进行酰化;B,对γ-氯乙酰乙酰头孢菌素(13a,b)进行侧链磺化,使用SO3-二氧戊烯,并通过与硫脲处理后形成噻唑环。头孢菌素在3位具有4-氨基甲酰基吡啶甲基(10c)表现出强效的抗假单胞菌活性,但对其他革兰氏阴性细菌活性较差,而3位具有1-甲基四氮唑-5-硫甲基(10b)的头孢菌素则显示出广谱活性,但对假单胞菌无抑制作用。