Palladium-Catalyzed Reaction of Haloarenes with Diarylethynes: Synthesis, Structural Analysis, and Properties of Methylene-Bridged Arenes
作者:Che-Wei Lee、En-Chih Liu、Yao-Ting Wu
DOI:10.1021/acs.joc.5b02111
日期:2015.11.6
Fluorenes and methylene-bridged polyarenes were easily and efficiently synthesized from haloarenes (or aryl triflates) and diarylethynes by a one-pot, two-step procedure. This protocol involves the palladium-catalyzed cycloisomerization and a subsequent base-mediated retro-aldol condensation. A major advantage is that the starting materials need not have ortho functional groups to complete the annulation
芴和亚甲基桥接的聚芳烃可以通过一锅,两步程序从卤代芳烃(或芳基三氟甲磺酸酯)和二芳基乙炔轻松高效地合成。该方案涉及钯催化的环异构化和随后的碱介导的逆醛醇缩合。一个主要的优点是,起始材料不需要具有邻位官能团即可完成环化反应。使用二卤代芳烃,高度π-共轭卤代芳烃或二芳基炔烃扩大了设计产品的骨架。苯并[ a]的形成机理对]芴进行了研究。通过X射线晶体学证实了亚甲基桥联的茚并环戊烯的碗状结构。研究了由此制备的产物的光物理和电化学性质。