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 asymmetricdehydration of β-alkenyl- or alkynyl-substituted β-hydroxyesters by kineticresolution has been investigated with five different chiral ligands 3–7. The kineticresolution 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-hydroxyesters 9–22 with selectivity factors ranging from