Application of iridium complexes in asymmetric catalytic hydrogenation of unsaturated carboxylic acids
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United States of America Patent
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Apr 8, 2014
Grant Date -
Apr 21, 2011
app pub date -
Jan 20, 2009
filing date -
Apr 25, 2008
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Abstract
The present invention relates to a preparation method of carboxylic acids with optical activity, particularly, publishes that very useful chiral carboxylic acids can be obtained by the asymmetric catalytic hydrogenation of tri-substituted α,β-unsaturated carboxylic acids, with the complexes of the chiral phosphor nitrogen ligands and iridium used as the catalysts which show high activity and enantioselectivity (up to 99.8% ee), thus provides a more efficient method with higher enantioselectivity for asymmetric catalytic hydrogenation of chiral carboxylic acid-like compounds, and has important application value to asymmetric hydrogenation of chiral carboxylic acids.
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