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2004
Enantioselective syntheses
O 0031
New Developments in the Synthesis of Heterotopic Atropisomeric Diphosphines
Diastereoselective Aryl Coupling Reactions. — The key step in the synthesis of
49- 038 via
the new title diphosphine (III) is a highly diastereoselective cyclization of the diether
(I). Ligand (III) is highly efficient in asymmetric hydrogenation of ketoesters and activated olefins as well as in asymmetric additions to α,β-unsaturated ketones. The results
are comparable to those obtained with BINAP and Me-O-Biphep indicating that use of
C2-symmetric atropisomeric ligands is not necessary to achieve high stereoselectivity.
— (MADEC, J.; MICHAUD, G.; GENET*, J.-P.; MARINETTI*, A.; Tetrahedron:
Asymmetry 15 (2004) 14, 2253-2261; Lab. Synth. Sel. Org. Prod. Nat., CNRS, Ec.
Natl. Super. Chim., F-75231 Paris, Fr.; Eng.) — Jannicke
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