A new cephalosporin. SCE-963: 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]-thio]methyl]ceph-3-em-4-carboxylic acid. Chemistry and structure-activity relationships.
A new cephalosporin. SCE-963: 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]-thio]methyl]ceph-3-em-4-carboxylic acid. Chemistry and structure-activity relationships.
Semisynthetic .BETA.-lactam antibiotics. IX. Synthesis and antibacterial activity of 7-(2-(2-aminothiazol-4-yl)-2-sulfoacetamido)cephalosporanic acid and its derivatives.
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.
A new cephalosporin. SCE-963: 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]-thio]methyl]ceph-3-em-4-carboxylic acid. Chemistry and structure-activity relationships.
The synthesis and the in vitro and in vivo antimicrobial activities of a series of 7-[2-(2-aminothiazol-4-yl)acetamido]cephalosporins (1) having varied 3-substituents, such as methyl, hydroxymethyl, acetoxymethyl, pyridiniomethyl and heterocyclicthiomethyls, are described. The derivatives having five membered heterocyclicthiomethyls exhibited strong inhibitory activities against Gram-negative organisms including some strains of Escherichia coli and Proteus morganii which are insensitive to cefazolin and cephaloridine. Pronounced activities were noted with 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]thio]methyl]ceph-3-em-4-carboxylic acid (1y; SCE-963).