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2005
Enantioselective syntheses
O 0031
Enantioselective Diethylzinc Additions to Aldehydes Catalyzed by Chiral Relay
— The addition of diethylzinc (IV) towards aldehydes (III), (VI) is readily
12- 034 Ligands.
catalyzed by new pyrazole ligands with fluxional chirality (I). It is shown that the enantioselectivity strongly depends on the bulkiness of remote ligands (R1) at the nitrogen.
Comparison of the results achieved with (Id) and (IId) further reveal that the stereochemistry of the product is controlled by the secondary hydroxyl group. — (SIBI*,
M. P.; STANLEY, L. M.; Tetrahedron: Asymmetry 15 (2004) 21, 3353-3356; Dep.
Chem., N. Dak. State Univ., Fargo, ND 58105, USA; Eng.) — Mischke
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