Rhodium(III)-catalyzed internal oxidative coupling of N-hydroxyanilides with alkenes via C–H activation
摘要:
Described herein is an efficient new method for ortho-olefination of anilides in the presence of AgSbF6 and NaOAc via rhodium(III)-catalyzed internal oxidative C-H bond activation based on hydroxyl as directing and oxidative group. A range of alkenes and functional groups on acetanilides is supported and a possible mechanism is proposed according to the experimental results. (C) 2015 Elsevier Ltd. All rights reserved.
Highly Effective Pd-Catalyzed ortho Olefination of Acetanilides: Broad Substrate Scope and High Tolerability
作者:Byung Seok Kim、Chungsik Jang、Dong Jin Lee、So Won Youn
DOI:10.1002/asia.201000613
日期:2010.11.2
Bring it on! An effective Pd‐catalyzed orthoolefination of various acetanilides has been developed. This transformation has a broadsubstratescope and wide functional‐group tolerability, regardless of the electronic and steric properties of acetanilidesubstrates, providing a straightforward access to highly functionalized arenes.
An Rh‐catalyzed selectiveC−H bond activation of diaryl‐substituted anilides is described. In an attempt to achieve C−Hactivation of C‐aryl rings, we unexpectedly obtained an N‐aryl ring product under non‐coordinating anion conditions, whereas the C‐aryl ring product was obtained in the absence of a non‐coordinating anion. This methodology has proved to be an excellent means of tuning and adjusting
Transition-metal-catalyzed aromatic olefination through directC–H activation represents an atom and step-economic route for versatile pharmaceutical syntheses, and in many cases, different stoichiometric oxidants are frequently employed for achieving a reasonable catalytic efficiency of the transition metal ions. Herein, we report a Lewis acid promotedPd(II)-catalyzed acetanilide olefination reaction with atmospheric
通过直接 C-H 活化的过渡金属催化芳烃烯化代表了一种用于多功能药物合成的原子和步骤经济路线,并且在许多情况下,经常使用不同化学计量的氧化剂来实现过渡金属离子的合理催化效率。在此,我们报道了路易斯酸促进的 Pd( II ) 催化的乙酰苯胺烯化反应,以大气分子氧为氧化剂源。路易斯酸通过二乙酸酯桥与 Pd( II ) 物质连接显着提高了其催化效率,并且对烯化步骤的独立动力学研究表明,添加路易斯酸显着加速了烯化速率以及 C-H 活化步。 Pd( II )盐中内部碱的强碱性也可能通过碱辅助的β-氢化物消除有利于烯化反应。
Pd(TFA)2-catalyzed oxidative coupling of anilides with olefins through CH bond activation under non-acidic conditions
作者:Xiaoli Yu、Wei Yao、Huida Wan、Zhaojun Xu、Dawei Wang
DOI:10.1016/j.jorganchem.2016.08.025
日期:2016.11
C-H bond activation is an important issue. The Pd-catalyzed and non-coordinating anion improved C-H bond activation was realized through the oxidative coupling reaction of anilides with olefins under non-acidic conditions. Additionally, the catalytic activity of palladium catalysts is enhanced by non-coordinating anions, further proving that non-coordinating anion can be used in palladium-involved reactions. (C) 2016 Elsevier B.V. All rights reserved.