Flexible Synthesis of Phenanthrenes by a PtCl<sub>2</sub>-Catalyzed Cycloisomerization Reaction
作者:Alois Fürstner、Victor Mamane
DOI:10.1021/jo025962y
日期:2002.8.1
Readily available biphenyl derivatives containing an alkyne unit at one of their ortho positions are converted into substituted phenanthrenes upon exposure to catalytic amounts of either PtCl(2), AuCl(3), GaCl(3), or InCl(3) in toluene. This 6-endo-dig cyclization likely proceeds through initial pi-coordination of the alkyne unit followed by interception of the resulting eta(2)-metal complex by the
暴露于催化量的甲苯中的PtCl(2),AuCl(3),GaCl(3)或InCl(3)时,容易获得的在邻位之一含有炔单元的联苯衍生物会转化为取代的菲。这种6-endo-dig环化反应可能是通过炔烃单元的初始pi-配位,然后被相邻的芳烃环截获所得的eta(2)-金属配合物而进行的。该反应固有地是模块化的,从而允许实质性的结构变化并允许在除了C-9之外的菲产物的任何位点处引入取代基。此外,该反应易于应用于杂环系列,如制备苯并吲哚,萘噻吩以及桥头氮杂环所示。