Orally active cephalosporins: synthesis, structure–activity relationships and oral absorption of 3-[( E ) and ( Z )-2-Substituted vinyl]-cephalosporins
7beta-[(Z)-2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamid o]-3-[(E)- and (Z)-2-substituted vinyl]-3-cephem-4-carboxylic acids was designed and synthesized usingpalladium-catalyzedcoupling reactions of a 3-methanesulfonyloxy-3-cephem and an E substituted vinylstannane or Wittig reaction of a 3-triphenylphosphoniummethyl cephem and an aldehyde as a key step. These compounds were evaluated for in vitro antibacterial