Novel crystalline forms of 6alpha, 9alpha-difluoro-11beta...

Details Novel crystalline forms of 6alpha, 9alpha-difluoro-11beta... Novel crystalline forms of 6alpha, 9alpha-difluoro-11beta...

A - Human Necessities

61

K

A61K 31/573 (2006.01)

Patent

CA 2575376

Novel crystalline forms II, III, IV, V, VI, VII and VIII of 6alpha,9 alpha - difluoro-11beta-hydroxy-16alpha-methyl-3-oxo-17alpha-propionyloxyandrosta-1,4- diene-17beta-carboxylic acid, a chemical intermediate useful in the preparation of fluticasone propionate, and novel methods of making these forms, substantially free of water, are disclosed.

L'invention concerne de nouvelles formes cristallines II, III, IV, V, VI, VII et VIII d'acide 6alpha,9 alpha -difluoro-11bêta-hydroxy-16alpha-méthyl-3-oxo-17alpha-propionyloxyandrosta-1,4-diène-17bêta-carboxylique, un intermédiaire chimique utilisé dans la préparation du propionate de fluticasone, ainsi que de nouveaux procédés de préparation de ces formes, sensiblement exemptes d'eau.

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