Exploiting the radical reactivity of diazaphosphinanes in hydrodehalogenations and cascade cyclizations
作者:Jingjing Zhang、Jin-Dong Yang、Jin-Pei Cheng
DOI:10.1039/d0sc01352h
日期:——
Here we exploited their unprecedented radical reactivity to implement hydrodehalogenations and cascade cyclizations originally inaccessible by hydride transfer. These reactions feature a broad substrate scope, high efficiency and simplicity of manipulation. Mechanistic studies suggested a radical chain process in which a phosphinyl radical is generated in a catalytic cycle via hydrogen-atom transfer
基于但众所周知的重氮反应性,二氮膦膦酸酯的显着还原性已被广泛应用于各种氢化反应中。在这里,我们利用它们前所未有的自由基反应性来实现氢化脱卤作用和氢化物转移原本无法实现的级联环化反应。这些反应具有广泛的底物范围,高效和操作简便的特点。机理研究表明,自由基链过程中,次膦酰基膦通过氢原子转移而在催化循环中生成次膦酰基。本文公开的二氮杂膦胺的自由基反应性与它们公认的氢化反应性不同,因此,为二氮杂膦烷在有机合成中的应用开辟了一条新途径。