METHOD OF SYNTHESIS OF CLAVULANIC ACID OR ITS PHARMACEUTICALLY ACCEPTABLE SALTS AND ETHERS, CLAVULANIC ACID SALT WITH AMINE

摘要

A process for the preparation and/or purification of clavulanic acid or a pharmaceutically acceptable salt thereof comprises i) contacting impure clavulanic acid or an alkali metal salt thereof in an organic solvent, with tertiary octylamine; ii) isolating the tertiary-octylamine salt of clavulanic acid formed; iii) converting the thus formed salt into clavulanic acid or a pharmaceutically acceptable salt or ester thereof.