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2005
Enantioselective syntheses
O 0031
Diastereomeric Phosphite—Pyridine Ligands for Enantioselective 1,4-Conjugate
— Ligands (I) derived from racemic biphenyl units and a (S)-BINOL moi31- 034 Additions.
ety are applied as 1:1 diastereomeric mixtures in Cu(I)-catalyzed 1,4-conjugate addition reactions of Et2Zn to acyclic enones. In most cases, (Ia) affords better enantioselectivities than the sterically more hindered (Ib). In several cases, (RS,S)- (Ia) produces
enantioselectivities that are comparable with the pure (S,S)-ligand, prepared previously. — (LUO, X.; HU, Y.; HU*, X.; Tetrahedron: Asymmetry 16 (2005) 6, 1227-1231;
Dalian Inst. Chem. Phys., Chin. Acad. Sci., Dalian 116023, Peop. Rep. China; Eng.)
— Klein
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