Polymorphs of esomeprazole salts
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United States of America Patent
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Jan 31, 2012
Grant Date -
Sep 9, 2010
app pub date -
Oct 8, 2007
filing date -
Oct 8, 2007
priority date (Note) -
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Abstract
The present invention relates to a high assayed esomeprazole magnesium dihydrate substantially free of its trihydrate form. The present invention further provides an improved and commercially viable process for preparation of high assayed esomeprazole magnesium dihydrate substantially free of its trihydrate form. The present invention also provides an improved process for preparation of pure amorphous esomeprazole magnesium. The present invention further provides an improved and commercially viable process for preparation of substantially enantiomerically pure esomeprazole in neutral form or as a pharmaceutically acceptable salt or as its solvates including hydrates. The present invention also provides solid form of esomeprazole calcium salt, its polymorphs (form 1, form 2 and amorphous form) and processes for their preparation thereof.
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