Asymmetric hydrogenation
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United States of America Patent
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Jul 2, 2002
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N/A
app pub date -
Dec 5, 2000
filing date -
Apr 9, 1998
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Abstract
The present invention pertains to a process for the preparation of an enantiomerically enriched chiral carboxylic acid derivative having the partial formula: C--C--C--COOX wherein X is a cation, comprising formation of a dehydro precursor salt having the partial formula: C.dbd.C--C--COOX by reaction of the corresponding precursor acid with an at least substantially stoichiometric amount of base, and asymmetric hydrogenation of the salt in the presence of a transition metal complex of a chiral phosphine ligand.
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