Process for the purification of montelukast

C - Chemistry – Metallurgy – 07 – D

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C07D 215/18 (2006.01) A61K 31/4704 (2006.01)

Patent

CA 2657017

It relates to a process for the purification of Montelukast, or pharmaceutically salts thereof, or solvates thereof, including stereoisomers or mixture thereof which comprises carrying out a specific set of selective solvent extractions of Montelukast or its impurities in a mixture of an organic solvent and water at specific ranges of pH and temperature which depend on the type of impurities to remove. In particular, it comprises at least one wash of an aqueous phase containing crude Montelukast in salt form with an organic solvent, at a pH comprised between 12.0 and 13.5; and optionally one or more washes of the resulting aqueous phase with an organic solvent at a pH comprised between 8.5 and 10Ø Montelukast is recovered by acidification at a pH comprised between 4.5 and 8.0 and solvent extraction, and is isolated either as acid or in salt form.

L'invention concerne un procédé de purification du montélukast, ou de ses sels pharmaceutiquement acceptables, ou de ses solvats, y compris ses stéréoisomères ou un mélange de ceux-ci, qui comprend la mise en AEuvre d'une série d'extractions sélectives par solvant du montélukast ou de ses impuretés dans un mélange constitué d'un solvant organique et d'eau à des plages spécifiques de pH et de températures qui dépendent du type des impuretés à enlever. En particulier, il comprend au moins un lavage d'une phase aqueuse contenant du montélukast brut sous la forme d'un sel avec un solvant organique, à un pH compris entre 12,0 et 13,5; et éventuellement un ou plusieurs lavages de la phase aqueuse résultante avec un solvant organique à un pH compris entre 8,5 et 10,0. Le montélukast est récupéré par acidification à un pH compris entre 4,5 et 8,0 et par extraction par solvant, et est isolé soit sous la forme d'un acide, soit sous la forme d'un sel.

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