Semisynthetic .BETA.-lactam antibiotics. IV. Synthesis and antibacterial activity of new ureidocephalosporin and ureidocephamycin derivatives containing a catechol moiety or its acetate.
Improvements in or relating to beta lactam production
申请人:BIOCHEMIE Gesellschaft m.b.H.
公开号:EP0523585A2
公开(公告)日:1993-01-20
A new process is described for the production of 7-alpha-aminoacylcephalosporin free from halogen-containing solvents by acylating 7-amino-ceph-3-em-4-carboxylic acid or a derivative thereof in a halogen-free solvent.
Semisynthetic .BETA.-lactam antibiotics. IV. Synthesis and antibacterial activity of new ureidocephalosporin and ureidocephamycin derivatives containing a catechol moiety or its acetate.
New ureidocephalosporin and ureidocephamycin derivatives containing a catechol moiety or its acetate were prepared and their minimum inhibitory concentration values against various microorganisms were determined. Among these compounds, the ureidocephalosporins (2, 3Aa, 3Ba) and ureidocephamycins (4, 5) carrying a methyl group on the nitrogen atom of the ureido bond showed strong activities against Pseudomonas aeruginosa. 7β- [(R) -2-[3- (3, 4-Dihydroxybenzoyl) -3-methylureido] -2-phenylacetamido] -7α-methoxy-3- [(1-methyl-1H-tetrazol-5-yl) -thiomethyl] -3-cephem-4-carboxylic acid (5) had the most potent activity in vitro against gramnegative bacteria, its activity being 8-to 32-fold and 4-fold greater than those of cefoperazone and ceftazidime, respectively, against two strains of P. aeruginosa. The structure-activity relationship is discussed.
A new process is described for the production of 7-alpha-aminoacyl-cephalosporin free from halogen-containing solvents by acylating 7-amino-ceph-3-em-4-carboxylic acid or a derivative thereof in a halogen-free solvent.