Homogeneous asymmetric hydrogenation using phosphine ligands of transition metals
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United States of America Patent
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Mar 27, 2001
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Dec 17, 1998
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Feb 20, 1998
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Abstract
A process for the preparation of an enantiomerically enriched 2-substituted succinic acid derivative of formula 2, which comprises asymmetric hydrogenation of the dehydro precursor of formula 7 or 8, or a mixture thereof ##STR1## wherein R.sup.1 and R.sup.2 are independently H, a salt-forming cation, or an organic group of up to 30 C atoms, and R.sup.3 and R.sup.4 are independently H or an organic group of up to 30 C atoms, provided that R.sup.3 and R.sup.4 are not both H, in the presence of a transition metal complex of a chiral phosphine ligand having the partial formula 10 ##STR2## wherein n is 0 to 6 and R represents at least one non-hydrogen organic group of up to 30 C atoms.
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