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The synthesis and antimicrobial activity of eight derivatives of 7-[(Z)-2-(2-aminothiazol-4-yl)- and 7-[(Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido] cephalosporins having an (E) or (Z)-3-ammonio-1-propenyl group in the C-3 side chain are described. The (E)-propenyl derivatives were more active than their corresponding Z-isomers and showed well-balanced, broad antibacterial activity against both Gram-positive and Gram-negative bacteria including Pseudomonas aeruginosa.

Synthesis of a new series of cephalosporins having 3-substituted-ammonio-1-propenyl group as the C-3 side chain.