Oxime Radical Promoted Dioxygenation, Oxyamination, and Diamination of Alkenes: Synthesis of Isoxazolines and Cyclic Nitrones
作者:Bing Han、Xiu-Long Yang、Ran Fang、Wei Yu、Chao Wang、Xiao-Yong Duan、Shuai Liu
DOI:10.1002/anie.201203799
日期:2012.8.27
Up the tempo: The intramolecular addition of oxime radicals to CC bonds was achieved by using DEAD and TEMPO to give 4,5‐dihydroisoxazoles as a result of a CO bond‐forming, 5‐exo‐trig cyclization. γ,δ‐Unsaturated ketoximes also reacted to afford cyclic nitrones through CN bond formation. The reactions offer a metal‐free approach for the vicinal difunctionalization of unactivated alkenes.
出速度:分子内除了肟基团到CC键的通过使用DEAD和TEMPO,得到4,5- dihydroisoxazoles作为结果实现一个C O键形成,5-外-trig环化。γ,δ不饱和酮肟也反应至C,得到环状硝酮 N键的形成。这些反应为未活化烯烃的邻位双官能化提供了一种无金属的方法。