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2005
Enantioselective syntheses
O 0031
Chiral C2-Symmetric Ligands Containing Two Binaphthyl Units Linked by
Bridge in Asymmetric Catalysis. — The catalytic activities of four
27- 027 2,2'-Bipyridyl
new chiral C2-symmetric ligands (I)-(IV) are tested in the diethylzinc addition towards
aldehydes (V), (VIII) and (X) as well as in the copper-catalyzed cyclopropanation of
styrene. Best results in both reactions are obtained using the ligands (II). The results
allow to draw conclusions on the optimal shape of the chiral cavity of the ligands. —
(BAI, X.-L.; KANG, C.-Q.; LIU, X.-D.; GAO*, L.-X.; Tetrahedron: Asymmetry 16
(2005) 3, 727-731; State Key Lab. Polym. Phys. Chem., Changchun Inst. Appl. Chem.,
Chin. Acad. Sci., Changchun 130022, Peop. Rep. China; Eng.) — Mischke
2005
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