Reversal of Regioselection in the Sharpless Asymmetric Aminohydroxylation of Aryl Ester Substrates
作者:Adam J. Morgan、Craig E. Masse、James S. Panek
DOI:10.1021/ol9903032
日期:1999.12.1
[formula: see text] The asymmetric synthesis of beta-hydroxy-alpha-amino acids is reported which relies on the use of alpha,beta-unsaturated aryl ester substrates and the dihydroquinyl alkaloid ligand system (DHQ)2-AQN to control the regio- and enantioselectivity of the asymmetric aminohydroxylation (AA) process. alpha,beta-Unsaturated ester substrates of type 1 have a significant effect on the substrate-ligand
[公式:参见文本]据报道,β-羟基-α-氨基酸的不对称合成依赖于使用α,β-不饱和芳基酯底物和二氢喹啉生物碱配体系统(DHQ)2-AQN来控制区域-和不对称氨基羟基化(AA)过程的对映选择性。1型α,β-不饱和酯底物对底物-配体识别事件有重大影响,这会导致AA反应中区域选择性的逆转。