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2005
Enantioselective syntheses
O 0031
Practical P-Chiral Phosphane Ligand for Rh-Catalyzed Asymmetric Hydrogena— The synthesis of a highly electron-donating and conformationally rigid P-chiral
26- 020 tion.
bis(phospholane) ligand (DuanPhos) in both enantiomeric forms is presented. It involves the resolution of racemic bis(phospholane oxide) with (L)- or (D)-dibenzoyl tartaric acid as key step. A rhodium—bis(phospholane) complex is successfully applied
as catalyst precursor in the asymmetric hydrogenation of various alkenes, e.g. dehydroamino acids (I), (III), (V), enamines (VIII), itaconic acid derivatives like (X) or enol
ethers (XI). — (LIU, D.; ZHANG*, X.; Eur. J. Org. Chem. 2005, 4, 646-649; Dep.
Chem., Pa. State Univ., University Park, PA 16802, USA; Eng.) — Mischke
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