Erythromycin derivative having novel crystal structures and...

C - Chemistry – Metallurgy – 07 – H

Patent

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C07H 17/08 (2006.01) A61K 31/7048 (2006.01) A61P 1/00 (2006.01)

Patent

CA 2425913

The present invention provides an E-type crystal of N-demethyl-N-isopropyl-12-methoxy-11-oxo-8,9--anhydroerythromycin A-6,9-hemiacetal fumarate having strong diffraction peaks at diffraction angles (2.theta.) of 5.6° and 10.4° as measured by powder X-ray diffractometry, which is prepared by treating a C-type crystal of the compound in a mixed solvent of ethyl acetate and water at 20°C to 40°C, and a D-type crystal prepared via the E-type crystal. These crystals have a reduced content of residual solvent and high suitability for formulation.

L'invention concerne des cristaux de forme E de A-6,9-hémiacétal fumarate de N-déméthyl-N-isopropyl-12-méthoxy-11-oxo-8,9-anhydroérythromycine, que l'on produit en traitant des cristaux de forme E de A-6,9-hémiacétal fumarate de N-déméthyl-N-isopropyl-12-méthoxy-11-oxo-8,9-anhydroérythromycine, possédant des pics de diffraction intenses au niveau d'angles de diffraction (2 theta ) de 5,6 DEG et 10,4 DEG dans une méthode de mesure par diffraction des rayons X sur poudre, et des cristaux de forme C de ce même fumarate, dans un solvant mixte se composant d'acétate d'éthyle et d'eau à une température comprise entre 20 et 40 DEG C; l'invention concerne également des cristaux de forme D de ce fumarate obtenus par l'intermédiaire de cristaux de forme E. Ces cristaux contiennent peu de solvants résiduels et sont appropriés à une utilisation dans des préparations pharmaceutiques.

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