Process for resolution of tamsulosin and compounds, compositons, and processes associated therewith
申请人:——
公开号:US20030109752A1
公开(公告)日:2003-06-12
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.
Process for resolution of tamsulosin and compounds, compositions, and processes associated therewith
申请人:Hoorn J. Hans
公开号:US20050096394A1
公开(公告)日:2005-05-05
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.
Racemic tamsulosin free base is obtained in solid form. The solid form can be formed by precipitating racemic tamsulosin free base from a solvent that comprises at least one of water or a lower alcohol. The crystalline free base exhibits polymorphism and two unique forms are identified. Novel intermediates are disclosed useful in the production of tamsulosin free base: a sulfonic acid salt of 2-(o-ethoxyphenoxy)ethylamine and (3-aminosulfonyl-4-methoxy)phenylacetone.