Factors Influencing the Regioselectivity of the Oxidation of Asymmetric Secondary Amines with Singlet Oxygen
作者:Dmitry B. Ushakov、Matthew B. Plutschack、Kerry Gilmore、Peter H. Seeberger
DOI:10.1002/chem.201500121
日期:2015.4.20
functionalization of amines. However, there are still several mechanistic uncertainties, particularly the factors governing the regioselectivity of the oxidation of asymmetric secondary amines and the oxidation rates of mixed primary amines. Herein, it is reported that singlet‐oxygen‐mediated oxidation of 1° and 2° amines is sensitive to the strength of the α‐CH bond and steric factors. Estimation of the
有氧胺氧化是胺的α功能化的一种有吸引力且优雅的方法。但是,仍然存在一些机械不确定性,特别是控制不对称仲胺氧化的区域选择性和混合伯胺氧化速率的因素。在此,据报道,单线态氧介导的1°和2°胺氧化对α- CH键和空间位阻的强度敏感。通过自然键顺序分析或通过一个键的C装置的相对键离解能的估计H耦合常数可以解释和预测仲胺氧化的区域选择性。此外,这些发现还用于合成高度区域选择性的底物,并进行选择性胺交叉偶联以生成亚胺。