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US 4,071,531 AGranted
Oxathiino- and dithiino-aminoacetic acids
AssigneeRhone-Poulenc Industries
InventorsChristian Berger, Daniel Farge, Georges Gros, Mayer Naoum Messer, Claude Moutonnier
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Abstract
New oxathiino- and dithiino-aminoacetic acids of the formula: ##STR1## in which A represents oxygen or sulphur, together with their racemic forms, their optically active forms and mixtures thereof, their reactive derivatives and their acid addition salts, are valuable intermediates for the preparation of therapeutically active derivatives, in particular cephalosporin derivatives of the formula: ##STR2## where R is hydrogen or acetoxy.
Claims5
An oxathiino- or dithiino-aminoacetic acid of formula:
- ##STR13## in which A is oxygen or sulphur, in racemic or optically active form, as the free acid or as a derivative thereof selected from an acid addition salt, an acid halide, and the anhydride.
Dependencies are inferred from the claim text.