Method for isolating (R)-tofisopam
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United States of America Patent
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Sep 4, 2007
Grant Date -
Dec 16, 2004
app pub date -
May 7, 2004
filing date -
May 9, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
(R)-tofisopam, substantially free of the (S)-enantiomer of tofisopam, is obtained by separating the enantiomers of tofisopam by chromatography employing a chiral separation medium comprising (i) (2S)-2-{(1S)[(3,5-dinitrophenyl)carbonylamino]phenylmethyl}-3,3-dimethylb-utanoate, covalently bound to silica through an alkylene ester linkage or (ii) an amylose derivative of formula I: ##STR00001## wherein each R.sup.1 and n are defined herein; the amylose derivative being coated on a porous inorganic carrier or a porous organic carrier.
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