Ni-Catalyzed Carboxylation of C(sp<sup>2</sup>)– and C(sp<sup>3</sup>)–O Bonds with CO<sub>2</sub>
作者:Arkaitz Correa、Thierry León、Ruben Martin
DOI:10.1021/ja410883p
日期:2014.1.22
an excellent chemoselectivity profile using air-, moisture-insensitive and easy-to-handle nickel precatalysts. Our results render our method a powerful alternative, practicality and novelty aside, to commonly used organic halides as counterparts in carboxylation protocols. Furthermore, this study shows, for the first time, that traceless directing groups allow for the reductive coupling of substrates
近年来,芳基卤化物和苄基卤化物与 CO2 的羧化取得了重大进展,成为使用化学计量量明确的金属物质的方便替代品。然而,这些过程中的大多数都需要使用自燃和空气敏感试剂,目前的方法主要限于有机卤化物。因此,非常希望发现一种温和的、操作简单的替代羧化反应,该羧化反应在广泛的底物范围内使用容易获得的偶联伙伴发生。在此,我们报告了一种新的协议,该协议涉及 CO2 协同活化的开发和惰性 C(sp(2))-O 和 C(sp(3))-O 键的相当具有挑战性的活化,这些键源自简单且廉价的酒精,这是该领域以前未被认识到的机会。这种前所未有的羧化事件的特点是其简单、温和的反应条件、显着的选择性模式以及使用对空气、水分不敏感且易于处理的镍预催化剂的优异化学选择性曲线。我们的结果使我们的方法成为一种强大的替代方案,实用性和新颖性,可以替代常用的有机卤化物作为羧化方案中的对应物。此外,这项研究首次表明,无痕导向基团允许在没有扩展
Ni-Catalyzed Decarboxylative Cross-Coupling of Potassium Polyfluorobenzoates with Unactivated Phenol and Phenylmethanol Derivatives
Ni‐catalyzed decarboxylative cross‐coupling of potassium polyfluorobenzoates with unactivated phenol and phenylmethanol derivatives is described. This novel transformation provides a practical and efficient protocol towards the synthesis of important polyfluorobiaryls and polyfluorinated diarylmethanes, and greatly enlarges the range of electrophiles utilized in decarboxylative coupling. Remarkably, preliminary
Multivalent butyrylcholinesterase inhibitor discovered by exploiting dynamic combinatorial chemistry
作者:Shuang Zhao、Jintao Xu、Shixin Zhang、Maochun Han、Yao Wu、Yusi Li、Lei Hu
DOI:10.1016/j.bioorg.2021.104656
日期:2021.3
polymer-based dynamic combinatorial library (DCL) incorporating exchangeable side chains using acylhydrazone formation reaction. In combination with tetrameric butyrylcholinesterase (BChE), the most potent binding side chain was identified, and the information obtained was further used for the synthesis of a multivalent BChE inhibitor. In the in vitro biological evaluation, this multivalent inhibitor exhibited
Methylation of Arenols through Ni-catalyzed C-O Activation with Methyl Magnesium Bromide
作者:Wen-Juan Shi、Zhang-Jie Shi
DOI:10.1002/cjoc.201700664
日期:2018.3
Direct alkylation of arenols with alkyl organometallic reagents has never been approached. Herein we reported the first successful example of nickel‐catalyzed methylation of arenols with methyl Grignard reagents to construct C(sp2)‐C(sp3) bond under mild conditions. The transformation was compatible with broad substrate scope of 2‐naphthol derivatives. Benzyl alcohol and biphenols were also suitable
C–O/C–H Coupling of Polyfluoroarenes with Aryl Carbamates by Cooperative Ni/Cu Catalysis
作者:Yang Wang、Song-Bai Wu、Wen-Juan Shi、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b00819
日期:2016.6.3
C–O and C–H bonds is reported. The reaction conditions are simple, and only transition-metal catalysts and ligands are essential. Mechanistic studies indicated that Ni catalyst played an important role in activating C–O bond, while the Cu one in activating C–H Bond. The developed system proved to be effective for cross-coupling of terminal alkynes with aryl carbamates.