Aerobic Aliphatic Hydroxylation Reactions by Copper Complexes: A Simple Clip‐and‐Cleave Concept
作者:Jonathan Becker、Yevheniia Y. Zhyhadlo、Ekaterina D. Butova、Andrey A. Fokin、Peter R. Schreiner、Moritz Förster、Max C. Holthausen、Pascal Specht、Siegfried Schindler
DOI:10.1002/chem.201802607
日期:2018.10.17
with dioxygen through a copper complex. The synthetic protocol involves reaction of a substrate aldehyde with N,N‐diethyl‐ethylendiamine to give the corresponding imine, which is used as a bidentate donor ligand forming a copper(I) complex with [Cu(CH3CN)4][CF3SO3]. After exposure of the reaction mixture to dioxygen acidic cleavage and aqueous workup liberates the corresponding β‐hydroxylated aldehyde
已开发出一种简单的亚胺剪切原理,用于通过铜配合物将脂肪族醛中未活化的CH键与双氧选择性羟基化。合成方案涉及底物醛与N,N-二乙基乙基乙二胺反应生成相应的亚胺,该亚胺用作双齿供体配体与[Cu(CH 3 CN)4 ] [CF形成铜(I)配合物3 SO 3]。反应混合物暴露于双氧酸裂解和水后处理后,释放出相应的β-羟基醛。研究了三甲基乙醛以及金刚烷和金刚烷1-咔醛的羟基化概念,并以较高的选择性获得了相应的β-羟基醛。低温停止流测量结果表明形成了双(μ-氧化)双铜配合物作为反应性中间体。根据密度泛函理论(DFT,RI-BLYP-D3 / def2-TZVP(SDD)/ COSMO(CH 2 Cl 2)// RI-PBE-D3 / def2-TZVP(SDD))计算适合于[Cu 2 O 2 ] 2+ 核通过协调一致的步骤以特别低的活化势垒进行羟基化,这解释了实验观察到的区域选择性。