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