Competition Studies in Alkyne Electrophilic Cyclization Reactions
作者:Saurabh Mehta、Jesse P. Waldo、Richard C. Larock
DOI:10.1021/jo802196r
日期:2009.2.6
toward alkyneelectrophiliccyclizationreactions has been studied. The required diarylalkynes have been prepared by consecutive Sonogashira reactions of appropriately substituted aryl halides and competitive cyclizations have been performed using I2, ICl, NBS and PhSeCl as electrophiles. The results indicate that the nucleophilicity of the competing functional groups, polarization of the alkyne triple
已经研究了各种官能团对炔烃亲电环化反应的相对反应性。所需的二芳基炔已通过适当取代的芳基卤化物的连续 Sonogashira 反应制备,并使用 I 2、ICl、NBS 和 PhSeCl 作为亲电子试剂进行竞争性环化。结果表明,竞争官能团的亲核性、炔烃三键的极化和中间体的阳离子性质是决定这些反应结果的最重要因素。
Copper-Catalyzed Sulfonylation/Cyclization of Pent-4-ynamides toward Sulfonyl-Functionalized Pyrrol-2-ones
作者:Danhua Wu、Menglu Jiang、Juan-Juan Wang、Wei Yu
DOI:10.1021/acs.orglett.3c00441
日期:2023.3.31
A domino sulfonylation/intramolecular C–N coupling/dehydrogenation reaction was realized between pent-4-ynamides and sulfonyl chlorides by catalysis of Cu(acac)2 and 2,2′-bis(diphenylphosphanyl)-1,1′-binaphthalene. The reaction provides a convenient approach to sulfonyl-functionalizedpyrrol-2-ones. This method can also be applied to the synthesis of 3-alkylidene isoindolinones from 2-ethynyl-benzamides
A new approach to isoindolinone derivatives by sequential palladium iodide-catalyzed oxidative aminocarbonylation–heterocyclization of 2-ethynylbenzamides
A novel approach to functionalized isoindolinone derivatives 3 is presented. It is based on a cascade process, consisting of PdI2/KI-catalyzed oxidative monoaminocarbonylation of secondary 2-ethynylbenzamides 1 with nucleophilic secondary amines 2, followed by intramolecular conjugate addition of the arylamido group to the alkynylamido group of the intermediate alkynylamides. Products have been obtained in high to excellent yields starting from different N-alkyl 2-ethynylbenzamides and amines, under relatively mild conditions (100 degrees C under 40 atm of a 4:1 mixture of CO-air), working in a MeCN-amine mixture (2:1, v/v) for 5-15 h. (C) 2012 Elsevier Ltd. All rights reserved.