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 aliphatic aldehydes has been developed. The process involves a new pathway to generate enolate intermediates from aliphatic aldehydes by oxidation and deprotonation. NHC=N‐heterocyclic carbene, Ts=4‐toluenesulfonyl.
已经开发出一种使用简单脂肪醛 以高达 98% 的产率和大于 99% 的ee和大于 20:1 dr的有效对映选择性方法形成反式 内酰胺和顺式内酯 。该过程涉及通过氧化和去质子化从脂肪醛生成烯醇中间体的新途径。NHC=N-杂环卡宾,Ts=4-甲苯磺酰基。