通过碱介导的重排将多种芳族和脂族异羟肟酸转化为相应的伯胺。这种重新排列可以少于1个当量进行。无需外部试剂的热条件下,在极性溶剂中分离K 2 CO 3。该重排具有几个特征,包括不需要用于促进重排的外部活化剂,少于一当量的碱足以进行该反应,以及其中仅产生二氧化碳作为副产物的清洁反应。提出了通过异氰酸酯中间体的自增长机理,并通过实验支持了基本的反应步骤,即链增长反应。
Divergent Synthesis of Tunable Cyclopentadienyl Ligands and Their Application in Rh-Catalyzed Enantioselective Synthesis of Isoindolinone
作者:Wen-Jun Cui、Zhi-Jie Wu、Qing Gu、Shu-Li You
DOI:10.1021/jacs.0c02813
日期:2020.4.22
unprecedented enantioselective [4+1] annulation reaction of benzamides and alkenes was achieved with a broad substrate scope under mild reaction conditions, providing a variety of isoindolinones with excellent regio- and enantioselectivity (up to 94% yield, 97:3 er). Preliminary mechanistic studies suggest that the reaction involves an oxidative Heck reaction and an intramolecular enantioselective alkene
Interweaving Visible‐Light and Iron Catalysis for Nitrene Formation and Transformation with Dioxazolones
作者:Jing‐Jing Tang、Xiaoqiang Yu、Yi Wang、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202016234
日期:2021.7.19
transfer reactions with dioxazolones for intermolecular C(sp3)-N, N=S, and N=P bond formation are described. These reactions occur with exogenous-ligand-free process and feature satisfactory to excellent yields (up to 99 %), an ample substrate scope (109 examples) under mild reaction conditions. In contrast to intramolecular C−H amidations strategies, an intermolecular regioselective C−H amidation via
Palladium-Catalyzed Cascade Decarboxylative Amination/6-<i>endo-dig</i> Benzannulation of <i>o</i>-Alkynylarylketones with <i>N</i>-Hydroxyamides To Access Diverse 1-Naphthylamine Derivatives
An efficient and practical one-pot strategy to produce highly substituted 1-naphthylamines via sequential palladium-catalyzed decarboxylative amination/intramolecular 6-endo-dig benzannulation reactions has been described. In this reaction, a broad range of electron-rich, electron-neutral, and electron-deficient o-alkynylarylketones react well with N-hydroxyl aryl/alkylamides to give a diversity of
Rh-Catalyzed Annulation of <i>ortho</i>
-C−H Bonds of 2-Arylimidazoles with 1,4,2-Dioxazol-5-ones toward 5-Arylimidazo[1,2-<i>c</i>
]quinazolines
作者:Xiaopeng Wu、Song Sun、Shengbo Xu、Jiang Cheng
DOI:10.1002/adsc.201701331
日期:2018.3.20
A Rh‐catalyzed unique and direct approach for constructing a series of 5‐arylimidazo[1,2‐c]quinazolines in moderate to excellent yields from simple and readily available 2‐arylimidazoles and 3‐phenyl‐1,4,2‐dioxazol‐5‐ones was described. This procedure proceeds with sequential ortho‐C−H bond amidation and cyclization, which represents a facile and straightforward pathway to access such frameworks.
用Rh催化的独特直接方法从简单易得的2芳基咪唑和3苯基-1,4,2-二恶唑-以中等到优异的收率构建一系列5芳基咪唑[1,2- c ]喹唑啉描述了5分。此过程以顺序的邻-C-H键酰胺化和环化进行,这代表了访问此类框架的便捷途径。
Rhodium(<scp>iii</scp>)-catalyzed diamidation of olefins <i>via</i> amidorhodation and further amidation
作者:Jinlei Wang、Guangfan Zheng、Xingwei Li
DOI:10.1039/d0cc00952k
日期:——
Rh(III)-catalyzed synthesis of vicinal diamides has been realized via elaboration of an authenticated Rh–C(sp3) species generated via initial intramolecular amidorhodation of olefins. The second amidation was achieved using both electrophilic and nucleophilic amidating reagents. The reactions proceeded under mild conditions with good yield, broad substrate scope, and excellent functional-group tolerance