Polymorphs modifications of...

C - Chemistry – Metallurgy – 07 – D

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C07D 277/56 (2006.01)

Patent

CA 2301863

A process for preparing various polymorphic modifications of 2-(3-cyano-4- isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid each selectively by crystallization under the specific conditions determined by temperature and methanol/water ratio of the mixed solvent to be used; and polymorphic modifications of 2-(3-cyano-4-isobutyloxyphenyl)-4- methyl-5-thiazolecarboxylic acid as obtained by this process. A process of subjecting a specific polymorphic modification of the above acid to heating and vacuum drying to thereby obtain another polymorphic modification of the acid or an amorphous modification thereof; and polymorphic or amorphous modifications of the acid as obtained by this process.

On décrit un procédé de préparation de diverses modifications polymorphes de 2-(3-cyano-4-isobutyloxyphényl)-4-méthyl-5-acide thiazolecarboxylique qui sont chacune effectuées sélectivement par cristallisation dans des conditions spécifiques déterminées par la température et le rapport méthanol/eau du solvant mélangé devant être utilisé; et les modifications polymorphes de 2-(3-cyano-4-isobutyloxyphényl)-4-méthyl-5-acide thiazolecarboxylique obtenues à l'aide de ce procédé. L'invention concerne également un procédé qui permet de soumettre une modification polymorphe spécifique de l'acide ci-dessus au chauffage et au séchage sous vide pour obtenir ainsi une autre modification polymorphe de l'acide ou une modification amorphe de ce dernier; et les modifications polymorphes ou amorphes de l'acide résultant de ce procédé.

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