Process for purifying a solution of an ampicillin pro-drug...

C - Chemistry – Metallurgy – 07 – D

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C07D 499/18 (2006.01) C07D 499/00 (2006.01)

Patent

CA 2315082

A process for purifying a solution of an ampicillin pro-drug, e.g. bacampicillin, or an acid addition salt thereof, which comprises a step wherein a crude solution thereof is subjected to an evaporation which is controlled by the evaporation rate of the organic solvent such that a continous operation is accomplished for the crystallization of the desired purified pro-drug ester, or salt thereof. Said crystallization is preferably preceded by an aqueous phase extraction and/or an organic phase extraction, both preferably also being performed continuously.

L'invention concerne un procédé de purification d'une solution contenant un ester bioprécurseur d'ampicilline, p. ex. la bacampicilline ou un sel d'addition acide de ce dernier. Ce procédé comprend une opération dans laquelle une solution brute de cet ester est soumise à une évaporation réglée en fonction de la vitesse d'évaporation du solvant organique, de manière que la cristallisation de l'ester bioprécurseur purifié ou du sel de ce dernier est réalisée au cours d'une opération continue. Cette cristallisation est de préférence précédée d'une extraction en phase aqueuse et/ou d'une extraction en phase organique, ces deux opérations étant de préférence également réalisées en continu.

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