C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 277/20 (2006.01) A61K 31/426 (2006.01) A61P 19/06 (2006.01) B01D 9/02 (2006.01) C07D 277/56 (2006.01)
Patent
CA 2656264
A process for selective production of crystal A of 2- (3-cyano-4-isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid which comprises dissolving 2-(3-cyano-4-isobutyloxy- phenyl)-4-methyl-5-thiazolecarboxylic acid in methanol or a methanol/water mixed solvent (having a methanol/water volume ratio of 90/10 or above), adding water to the resulting solution to adjust the methanol/water ratio to 7/3, and adding a specified amount of seed crystals to the solution during the addition of water at a specified stage.
L'invention concerne la fabrication sélective d'un cristal A d'acide 2- (3-cyano-4-isobutyloxyphényl)-4-méthyl-5-thiazolecarboxylic qui comprend la dissolution d'acide 2-(3-cyano-4-isobutyloxy-phényl)-4-méthyl-5-thiazolecarboxylic dans le méthanol ou un solvant mixte méthanol/eau (ayant un rapport en volume méthanol/eau de 90/10 ou au-dessus), l'addition d'eau à la solution résultante pour ajuster le rapport méthanol/eau à 7/3, et l'addition d'une quantité spécifiée de cristaux d'ensemencement à la solution pendant l'addition d'eau à un stade spécifié.
Borden Ladner Gervais Llp
Kitamura Mitsutaka
Teijin Pharma Limited
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