New Diels–Alder reactions of 3-vinylindoles with an aryne: selective access to functionalized [a]anellated carbazoles
作者:Eugenia Gonzalez、Ulf Pindur、Dieter Schollmeyer
DOI:10.1039/p19960001767
日期:——
for the reactions of donor- and acceptor-substituted 3-vinylindoles with aryne and structurally related 3,4-pyridyne are described. Aryne reacts in Diels–Alder reactions as a dienophile to give rise to a variety of [a]anellated carbazoles in a one-step procedure. Additionally, aryne is involved in an ene or conjugate addition reaction with the initially formed [4 + 2]cycloadduct. Reaction of methyl
描述了供体和受体取代的3-乙烯基吲哚与亚芳基和与结构相关的3,4-吡啶炔的反应的新结果。Aryne以亲二烯体的形式在Diels-Alder反应中进行反应,从而一步一步产生各种[ a ]芳基咔唑。此外,芳烃与最初形成的[4 + 2]环加合物参与烯或共轭加成反应。(E)-3-(N-甲基吲哚-3-基)丙烯酸甲酯(6)在空气中的反应除预期的Diels-Alder产物外,还提供了新的苯并氧杂环丁烷[ b ]吲哚衍生物14。原位3-乙烯基吲哚 生成的3,4-吡啶炔难以控制,无法分离出具有所需纯度的环加合物。