Cephalosporin antibiotics

Details Cephalosporin antibiotics Cephalosporin antibiotics

1981-07-23

1984-08-07

Rizzo, Nicholas S.

Drug, bio-affecting and body treating compositions

Antigen, epitope, or other immunospecific immunoeffector

Bacterium or component thereof or substance produced by said...

544 22, 544 25, C07D50138, A61K 31425

Patent

active

044643683

ABSTRACT:
Cephalosporin antibiotics of general formula ##STR1## (wherein R.sup.a and R.sup.b, which may be the same or different, each represent a C.sub.1-4 alkyl group, or together with the carbon atom to which they are attached form a C.sub.3-7 cycloalkylidene group and R.sup.1 represents a C.sub.1-4 alkyl group) exhibit broad spectrum antibiotic activity, the activity being unusually high against gram-negative organisms such as strains of Pseudomonas organisms.
Particularly effective compounds of formula (I) are (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-(2-carboxyprop-2-oxyimino)acetami do]-3-(2-methylpyrazolium-1-ylmethyl)ceph-3-em-4-carboxylate and (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-[(1-carboxycyclobut-1-oxyimino)ac etamido]-3-(2-methylpyrazolium-1-ylmethyl)]ceph-3-em-4-carboxylate. The invention also includes the non-toxic salts and non-toxic metabolically labile esters of compounds of formula (I), compositions containing the antibiotic compounds of the invention, and methods for combatting bacterial infections utilizing the antibiotics.

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