Cascade intramolecular imidoylation and C–H activation/annulation of benzimidoyl chlorides with alkynes: one-pot synthesis of 7<i>H</i>-dibenzo[<i>de</i>,<i>h</i>]quinoline analogues
作者:Jiao Liu、Hao Fang、Rui Cheng、Zhishuo Wang、Yudong Yang、Jingsong You
DOI:10.1039/c9cc03400e
日期:——
Reported herein is a cascade Lewis acid-promoted intramolecular Friedel–Crafts-type imidoylation and Rh(III)-catalyzed C–H activation/annulation of benzimidoyl chlorides and alkynes, providing a general and concise one-pot approach to 7H-dibenzo[de,h]quinoline analogues. This divergent approach is based on a convergent retrosynthetic disconnection strategy.
We report our latest discovery of norbornene derivative modulated highly mono-selective ortho-C–H activation alkylation reactions on arenes bearing simple mono-dentate coordinating groups.
我们报告了我们最新发现的辛环烯衍生物调控高度单选择性的芳烃上的ortho-C-H活化烷基化反应。
Testing the limits of radical-anionic CH-amination: a 10-million-fold decrease in basicity opens a new path to hydroxyisoindolines<i>via</i>a mixed C–N/C–O-forming cascade
作者:Quintin Elliott、Gabriel dos Passos Gomes、Christopher J. Evoniuk、Igor V. Alabugin
DOI:10.1039/c9sc06511c
日期:——
An intramolecular C(sp3)–H amidation proceeds in the presence of t-BuOK, molecular oxygen, and DMF. This transformation is initiated by the deprotonation of an acidic N–H bond and selective radical activation of a benzylic C–H bond towards hydrogen atom transfer (HAT). Cyclization of this radical–anion intermediate en route to a two-centered/three-electron (2c,3e) C–N bond removes electron density
A new synergistic multicatalytic activation mode of eosinY has been discovered by exploiting the redox potential of its ground state and excited state. This catalytic strategy proves to be an enabling tool for visible‐light‐driven sequentialbenzylicC−Hamination and oxidation of o‐benzyl‐N‐methoxyl‐benzamides when using Selectfluor as a hydrogen atom transfer (HAT) reagent and O2 as oxidant. Efficient
iron/photoredox dual-catalyzed acyl nitrene formation and the use of acyl nitrene in constructing various C–O bonds towards phthalides. The developed reaction starts from N-methoxyl-2-alkylbenzamides. Mechanism surveys suggest the reaction involves iron nitrene-based hydrogen atom abstraction (HAA), radical-polar crossover and O-nucleophilic SN1. Distinctively, the often-reported radical rebound in previous publications
本文描述了铁/光氧化还原双催化酰基氮烯的形成以及酰基氮烯在构建各种 C-O 键中对苯酞的应用。开发的反应从N -methoxyl-2-alkylbenzamides 开始。机理调查表明,该反应涉及基于铁氮烯的氢原子提取 (HAA)、自由基-极性交叉和O-亲核 S N 1。值得注意的是,未观察到以前出版物中经常报道的自由基反弹。该反应代表了基于酰基氮烯的苯酞合成的第一个例子。此外,它还作为合成3-丁基苯酞(NBP)、沙利度胺、Pomalyst和Otezia等市售药物的补充剂。