Kinetic Resolution of β-Alkenyl-, β-Alkynyl- and β-Flavenyl-Substituted β-Hydroxy Esters in Asymmetric Dehydration
作者:Min Hee Lee、Eui Ta Choi、Dajung Kim、Yoon Min Lee、Yong Sun Park
DOI:10.1002/ejoc.200800807
日期:2008.11
Catalytic asymmetric dehydration of β-alkenyl- or alkynyl-substituted β-hydroxy esters by kinetic resolution has been investigated with five different chiral ligands 3–7. The kinetic resolution of a variety of racemic β-hydroxy tert-butyl esters in the presence of a prolinol chiral ligand and BrZnCH2CO2tBu provided highly enantio-enriched β-hydroxy esters 9–22 with selectivity factors ranging from
已经使用五种不同的手性配体 3-7 研究了通过动力学拆分对 β-烯基或炔基取代的 β-羟基酯进行催化不对称脱水。在脯氨醇手性配体和 BrZnCH2CO2tBu 存在下,多种外消旋 β-羟基叔丁酯的动力学拆分提供了高度对映体富集的 β-羟基酯 9-22,选择性因子范围为 11 到 59。此外,证明了这种不对称合成方法在制备富含对映体的黄酮衍生物 23-29 中的应用。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)