Process for obtaining pure oseltamivir
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United States of America Patent
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Jun 8, 2010
Grant Date -
Jun 11, 2009
app pub date -
Jan 2, 2006
filing date -
Jan 2, 2006
priority date (Note) -
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Abstract
The present invention provides a process for obtaining highly pure crystalline form of oseltamivir free base, thus, for example, suspending or dissolving impure or non-crystalline oseltamivir free base in a hydrocarbon solvent and then isolating crystals to obtain oseltamivir free base in well defined crystalline form. The present invention also provides a process for preparation of oseltamivir phosphate in high purity.
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