Formal [4 + 1] Cycloadditions of β,β-Diaryl-Substituted <i>ortho</i>-(Alkynyl)styrenes through Gold(I)-Catalyzed Cycloisomerization Reactions
作者:Ana M. Sanjuán、Cintia Virumbrales、Patricia García-García、Manuel A. Fernández-Rodríguez、Roberto Sanz
DOI:10.1021/acs.orglett.6b00191
日期:2016.3.4
Gold(I)-catalyzed cycloisomerization of β,β-diaryl-o-(alkynyl)styrenes at 80 °C selectively yields dihydroindeno[2,1-a]indenes in a transformation that encompasses a formal [4 + 1] cycloaddition and takes place through a cascade 5-endo-cyclization–diene activation–iso-Nazarov cyclization. In addition, by performing the reaction at 0 °C, the same substrates exclusively give rise to benzofulvene derivatives
金(I)在80°C催化β,β-二芳基-邻-(炔基)苯乙烯的环异构化,选择性地生成二氢茚并[2,1- a ]茚,其转化过程涉及正式的[4 +1]环加成反应,通过级联5-场所内切-cyclization二烯活化-异-Nazarov环化。另外,通过在0℃下进行反应,相同的底物仅产生苯并富勒烯衍生物,其也已显示出是四环形成中的中间体。