Process for resolution of tamsulosin and compounds, compositions, and processes associated therewith
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United States of America Patent
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Nov 15, 2005
Grant Date -
May 5, 2005
app pub date -
Nov 15, 2004
filing date -
Oct 31, 2001
priority date (Note) -
Expired
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Abstract
Optically impure tamsulosin including racemic tamsulosin can be resolved into optically pure (R)- or (S)-tamsulosin by the use of diastereomeric sulfonate salts of tamsulosin in a fractional crystallization technique. Racemic tamsulosin free base is a useful starting material for the resolution process and a method of obtaining the same in solid form, including two crystalline polymorphic forms, is also provided.
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