在此,我们公开了通过镍催化的不饱和肟酯与容易获得的芳基卤化物的还原交叉偶联对烯烃进行一般且实用的亚氨基化,为构建吡咯啉衍生物提供了一种权宜之计。不存在有机金属试剂使反应能够在温和的条件下发生,具有广泛的底物范围和良好的官能团耐受性。此外,其他基于 C 的亲电子试剂,包括烯基、炔基和烷基卤化物或假卤化物,也是该反应的合适底物。
Highly Efficient Narasaka-Heck Cyclizations Mediated by P(3,5-(CF3)2C6H3)3: Facile Access to N-Heterobicyclic Scaffolds
作者:Adele Faulkner、John F. Bower
DOI:10.1002/anie.201107511
日期:2012.2.13
N‐heterobicyclic scaffolds: Highlyefficient palladium‐catalyzed cyclizations of oxime esters with cyclic alkenes were used as a general entry to perhydroindole and related scaffolds. The chemistry is reliant upon the use of P(3,5‐(CF3)2C6H3)3 for the key C(sp3)N bond‐forming process and this facilitates cyclizations with enhanced levels of efficiency across a range of sterically and electronically
N-杂环双环支架:肟酯与环烯烃的高效钯催化环化反应通常用作过氢吲哚和相关支架的入口。化学过程依赖于关键的C(sp 3)N键形成过程使用P(3,5-(CF 3)2 C 6 H 3)3的形成,这有利于环化反应,并提高了整个反应过程的效率。一系列在空间和电子方面不同的基材。
Iminoxyl Radical-Promoted Dichotomous Cyclizations: Efficient Oxyoximation and Aminooximation of Alkenes
作者:Xie-Xue Peng、Yun-Jing Deng、Xiu-Long Yang、Lin Zhang、Wei Yu、Bing Han
DOI:10.1021/ol502258n
日期:2014.9.5
A novel iminoxyl radical-involved metal-free approach to vicinal oxyoximation and aminooximation of unactivated alkenes is developed. This method utilizes the dichotomous reactivity of the iminoxyl radical to furnish a general difunctionalization on alkenes using simple tert-butyl nitrite (TBN) as the iminoxyl radical initiator as well the carbon radical trap. By using this protocol, oxime featured 4,5-dihydroisoxazoles and cyclic nitrones were facilely prepared from beta,gamma- and gamma,delta-unsaturated ketoximes, respectively.