Asymmetric Carbene‐Catalyzed Oxidation of Functionalized Aldimines as 1,4‐Dipoles
作者:Guanjie Wang、Qiao‐Chu Zhang、Chenlong Wei、Ye Zhang、Linxue Zhang、Juhui Huang、Donghui Wei、Zhenqian Fu、Wei Huang
DOI:10.1002/anie.202017017
日期:2021.3.29
The use of functionalized aldimines has been demonstrated as newly structural 1,4‐dipole precursors under carbene catalysis. More importantly, enantiodivergent organocatalysis has been successfully developed using carbene catalysts with the same absolute configuration, leading to both (R)‐ and (S)‐ enantiomers of six‐membered heterocycles with quaternary carbon centers. This strategy features a broad
在卡宾催化下,已证明官能化的亚胺的使用是新结构的1,4-偶极子前体。更重要的是,使用具有相同绝对构型的卡宾催化剂成功开发了对映异构有机催化,从而导致(R)-和(S)具有四元碳中心的六元杂环的对映异构体。该策略具有广泛的底物范围,温和的反应条件和良好的对映体比率。DFT计算结果表明,催化剂与底物之间的氢键CH-H···F相互作用是控制甚至改变对映选择性的关键因素。这些新的1,4-偶极子还可以在卡宾催化下与Isatin及其亚胺反应,从而以极好的对映体比率获得螺环吲哚。