C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 277/56 (2006.01)
Patent
CA 2566652
The present invention provides a technique of selectively producing a desired polymorph of 2-(3-cyano- 4-isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid. The present invention also provides a method of producing various polymorphs of 2-(3-cyano-4- isobutyloxyphenyl)-4-methyl-5-thiazolecarboxylic acid, which comprises crystallizing under the conditions defined by a specific temperature and a composition of a mixed solvent of methanol and water, and polymorphs obtained by the method. The present invention further provides a method of producing the other polymorphs or amorphous compounds by drying a specific polymorph under a reduced pressure with heating, and the other polymorphs or amorphous compounds obtained by the method.
Hiramatsu Toshiyuki
Kitamura Mitsutaka
Matsumoto Koichi
Watanabe Kenzo
Borden Ladner Gervais Llp
Teijin Limited
Teijin Pharma Limited
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