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 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
Ni-Catalyzed Stannylation of Aryl Esters via C−O Bond Cleavage
作者:Yiting Gu、Rúben Martín
DOI:10.1002/anie.201611720
日期:2017.3.13
Ni‐catalyzed stannylation of aryl esters with air‐ and moisture‐insensitive silylstannyl reagents via C −Ocleavage is described. This protocol is characterized by its wide scope, including challenging combinations, thus enabling access to versatile building blocks and orthogonal C−heteroatom bond formations.
efficient and straightforward approach for the synthesis of C7 site-selective BINOL derivatives has been achieved via cost-effective Co(III)-catalyzed C–Hcascadealkenylation/intramolecular Friedel–Crafts alkylation of BINOL units and propargyl cycloalkanols. Under the advantage of the pyrazole directing group, the protocol allows the rapid synthesis of various BINOL-tethered spiro[cyclobutane-1,1′-indenes]
Honokiol-Inspired Analogs as Inhibitors of Oral Bacteria
作者:Amy E. Solinski、Cristian Ochoa、Young Eun Lee、Thomas Paniak、Marisa C. Kozlowski、William M. Wuest
DOI:10.1021/acsinfecdis.7b00178
日期:2018.2.9
The oral microbiome is a complex ecological niche where both commensal and pathogenic bacteria coexist. Previous reports have cited that the plant isolate honokiol is a potent inhibitor of S. mutans biofilms. Herein we report a cross-coupling method that provides access to a concise library of honokiol-inspired analogs. Through this work we determined that the inhibitory activity of honokiol is highly dependent on the growth conditions. Further, we identify a series of analogs that display significant potency against oral bacteria leading to the discovery of a potent antimicrobial.