Synthesis and structure-activity relationships of a new series of cephalosporins, BMY-28142 and related compounds.

The synthesis of a series of 7-[(Z)-2-(2-aminothiazol-4-yl)-2-oxyiminoacetamido] -3-ammoniomethyl-3-cephems is described. Variations of an oxyimino moiety in the 7-side chain and a quaternary ammonium moiety in the 3-side chain were examined and structure-activity relationships studied. BMY-28142, the 3-(N-methylpyrrolidinio)methyl derivative of the 7-alpha-methoxyimino series of cephalosporins, exhibited broad antimicrobial activity against both Gram-positive and Gram-negative bacteria including Pseudomonas aeruginosa.