N-Heterocyclic-Carbene-Catalyzed Asymmetric Oxidative Hetero-Diels-Alder Reactions with Simple Aliphatic Aldehydes
作者:Xiaodan Zhao、Kyle E. Ruhl、Tomislav Rovis
DOI:10.1002/anie.201206490
日期:2012.12.3
approach to form trans lactams and cis lactones in up to 98 % yield with greater than 99 % ee, and greater than 20:1 d.r. using simple aliphaticaldehydes has been developed. The process involves a new pathway to generate enolate intermediates from aliphaticaldehydes by oxidation and deprotonation. NHC=N‐heterocyclic carbene, Ts=4‐toluenesulfonyl.