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
Copper-Catalyzed Cascade Cyclization of Arylsulfonylhydrazones Derived from <i>ortho</i>-Alkynyl Arylketones: Regioselective Synthesis of Functionalized Cinnolines
作者:Biao Yao、Tao Miao、Wei Wei、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.9b03134
日期:2019.12.6
A novel copper-catalyzed cascade reaction of arylsulfonylhydrazones derived from ortho-alkynyl arylketones was accomplished. This reaction provides concise access to diversified cinnolines in good yields. The mechanistic investigations have disclosed involvement of the key alkynyl amination, 1,4-aryl migration, desulfonylation, and diazo radical cyclization cascade in the transformation.
Radical-Triggered Tandem Cyclization of 1,6-Enynes with H<sub>2</sub>O: A Way to Access Strained 1<i>H</i>-Cyclopropa[<i>b</i>]naph thalene-2,7-diones
作者:Limeng Zheng、Bingwei Zhou、Hongwei Jin、Ting Li、Yunkui Liu
DOI:10.1021/acs.orglett.8b03007
日期:2018.11.16
developed herein. Strained 1H-cyclopropa[b]naphthalene-2,7-diones are successfully obtained in moderate to good yields with excellent stereoselectivity. Mechanistic studies reveal a key role of water in generating a hydroxyl radical that initiates a sequential Michaeladdition/ring closure pathway. Importantly, the formed hydroxyl is proposed to be a good leaving group during the cyclopropane ring formation
本文已经开发了自由基引发的1,6-烯炔的串联环化。以中等至良好的产率和优异的立体选择性成功获得了应变的1 H-环丙烷[ b ]萘-2,7-二酮。机理研究揭示了水在产生羟基自由基中的关键作用,该羟基自由基引发了顺序的迈克尔加成/环闭合路径。重要的是,提议的形成的羟基在环丙烷环形成期间是良好的离去基团。
A rhodium-catalysed Sonogashira-type coupling exploiting C–S functionalisation: orthogonality with palladium-catalysed variants
作者:Milan Arambasic、Manjeet K. Majhail、Robert N. Straker、James D. Neuhaus、Michael C. Willis
DOI:10.1039/c9cc00092e
日期:——
A rhodium(i) catalyst mediates selective and efficient coupling reactions between arylmethylsulfides and terminal alkynes to provide Sonogashira-like products.
Chemo‐ and Regioselective Catalyst‐Controlled Carbocyclization of Alkynyl Ketones: Rapid Synthesis of 1‐Indanones and 1‐Naphthols
作者:Liangliang Song、Guilong Tian、Erik V. Van der Eycken
DOI:10.1002/chem.201901860
日期:2019.6.7
A catalyst‐controlled intramolecular carbocyclization of 2‐alkynyl aryl ketones is presented. Under rhodium(III) catalysis, 1‐indanones are formed through 5‐exo‐dig carbocyclizations with exclusive chemo‐, regio‐ and stereoselectivity. When catalyzed by copper(I), 1‐naphthols are obtained through 6‐endo‐dig carbocyclizations with exclusive chemo‐ and regioselectivity.