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2005
Amino acids
U 0400
Practical Rh(I)-Catalyzed Asymmetric Hydrogenation of β-(Acylamino)acrylates
a New Unsymmetrical Hybrid Ferrocenylphosphine—Phosphoramidite
24- 174 Using
Ligand: Crucial Influence of an N—H Proton in the Ligand. — The unsymmetrical ligand (I) is shown to be effective in the title reaction of β-(acylamino)acrylates,
where an N-H proton on the amine unit of ligands displays a dominant role in the enantioselectivity. For the first time, individual hydrogenation of (E)- and (Z)-isomers is
performed under identical conditions using the same catalytic system. β-Amino acid
derivatives are obtained with the opposite configuration and excellent enantioselectivity. — (HU, X.-P.; ZHENG*, Z.; Org. Lett. 7 (2005) 3, 419-422; Dalian Inst. Chem.
Phys., Chin. Acad. Sci., Dalian 116023, Peop. Rep. China; Eng.) — Steudel
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