A new method for preparation of zopiclone and its polymorphs

C - Chemistry – Metallurgy – 07 – D

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C07D 487/04 (2006.01) A61K 31/4985 (2006.01) A61P 25/00 (2006.01)

Patent

CA 2692955

A process for the preparation of crystalline Zopiclone comprising i) suspending zopiclone in a mixture of acetonitrile and diisopropyl ether, filtering and drying the resulting solid; ii) dissolving the solid in step i) in N,N-dimethylformamide to get a clear solution; iii) heating and then precipitating solid; iv) filtering and drying the solid to get crystalline zopiclone. Crystalline zopiclone Form C. Crystalline Zopiclone Form D characterized by an X-ray powder diffraction pattern that comprises peaks with 2theta values of at least 14.8, 19.8, 21.3, 27.3 °2.theta. ~ 0.2 °2.theta.. A process for preparation of crystalline Zopiclone Form D comprising dissolving Zopiclone in N,N-dimethylformamide and filtering; washing clear filtrate with an alkali solution; separating and concentrating the organic layer, adding isopropyl alcohol thereto and concentrating further to get a slurry; filtering the slurry and drying the resultant solid to get crystalline Zopiclone form D. Pharmaceutical composition comprising crystalline forms of Zopiclone. Disclosed are processes for the preparation of crystalline polymorphic forms of zopiclone and their pharmaceutical compositions for use as a sedative.

L'invention porte sur un procédé de préparation de zopiclone cristalline consistant à i) mettre en suspension de la zopiclone dans un mélange d'acétonitrile et d'éther diisopropylique, à filtrer et à sécher le solide résultant; ii) à dissoudre le solide de l'étape i) dans du N,N-diméthylformamide pour obtenir une solution transparente; iii) à chauffer puis à faire précipiter le solide; iv) et à filtrer et à sécher le solide pour obtenir de la zopiclone cristalline. L'invention porte sur une forme C de zopiclone cristalline, sur une forme D de zopiclone cristalline caractérisée par un motif de diffraction des rayons X sur poudre qui inclut des pics avec des valeurs 2thêta d'au moins 14,8, 19,8, 21,3, 27,3 °2? ± 0,2 °2?. L'invention porte sur un procédé de préparation de la forme D de la zopiclone cristalline, comprenant la dissolution de la zopiclone dans du N,N-diméthylformamide et la filtration; le lavage du filtrat transparent par une solution alcaline; la séparation et la concentration de la couche organique, l'ajout d'alcool isopropylique à celle-ci et une nouvelle concentration pour obtenir une bouillie; la filtration de la bouillie et le séchage du solide résultant pour obtenir la forme D de la zopiclone cristalline. L'invention porte sur une composition pharmaceutique contenant des formes cristallines de la zopiclone.

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