Process for preparing tamsulosin hydrochloride
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United States of America Patent
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Sep 25, 2012
Grant Date -
Oct 21, 2010
app pub date -
Aug 10, 2006
filing date -
Sep 12, 2005
priority date (Note) -
Expired
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Abstract
The invention relates to an process for preparing Tamsulosin hydrochloride of Formula (I) which comprises (i) reacting (R)-(−)-5-(2-amino-propyl)-2-methoxybenzenesulfonamide of Formula (II) with substituted phenoxy compound of Formula (III), wherein Z represents a removing group, such as —OSO2CH3, —OSO2C6H4CH3, —F, —Br, —Cl, or —I, in a solvent in the presence of an alkaline earth metal oxide to obtain Tamsulosin base and (ii) converting Tamsulosin base into hydrochloride salt in a solvent by addition of aqueous hydrochloric acid.
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