PROCESS FOR ISOLATING LEVAMISOLE FROM TETRAMISOLE

摘要

A process for isolating levamisole or a therapeutically acceptable acid addition salt thereof from tetramisole or an acid addition salt thereof which comprises the precipitation of a diastereomeric acid addition salt of Ievamisole with L-N-[(4-methoxyphenyl)sulfonyl]glutamic acid, the isolation of said diastereomeric salt, the liberation of Ievamisole therefrom and optionally its conversion into a therapeutically acceptable acid addition salt by the reaction with an appropriate acid.