Cephalosporin derivatives, processes for producing the same and compositions containing them.

摘要

Novel cephalosporin derivatives, processes for preparing thereof, compositions for preventing and/or treating infectious diseases which comprise the novel cephalosporin derivatives as active components, and the intermediate compounds in synthesis of cephalosporin derivative and processes for producing thereof are disclosed.
<??>The novel cephalosporin derivatives contain condensed heterocyclic groups, particularly a triazolopyrimidine ring or a thiadiazolopyrimidine ring as substituents at the 3-position of the cephem skeleton, and a hydroxyimino, an alkyloxyimino or an acyloxyimino moiety as substituents at the 7-position of the cephem skeleton.
<??>These compounds have a strong antibacterial activity against gram-negative bacteria and also against gram-positive bacteria including methicillin-resistant Staphylococcus aureus. They are extremely useful for the treatment of infectious diseases.