Regulation of the flexibility of planar chiral [2.2]paracyclophane ligands and its significant impact on enantioselectivity in asymmetric reactions of diethylzinc with carbonyl compounds
作者:Xun-Wei Wu、Tang-Zhi Zhang、Ke Yuan、Xue-Long Hou
DOI:10.1016/j.tetasy.2004.06.026
日期:2004.8
A series of planarchiral ligands derivedfrom [2.2]paracyclophane were synthesized and applied as catalysts in enantioselective additions of diethylzinc to aldehydes and α,β-unsaturated ketones. When ligand 10 with a dimethyl hydroxymethyl as the substituent was used, the enantioselectivity of the reaction of diethylzinc with aldehydes was much higher than when using ligand 3c with diphenyl hydroxymethyl