Construction of Hexahydrophenanthrenes By Rhodium(I)-Catalyzed Cycloisomerization of Benzylallene-Substituted Internal Alkynes through C−H Activation
作者:Yasuaki Kawaguchi、Shigeo Yasuda、Chisato Mukai
DOI:10.1002/anie.201605640
日期:2016.8.22
The treatment of benzylallene‐substituted internal alkynes with [RhCl(CO)2]2 effects a novel cycloisomerization by C(sp2)−H bond activation to produce hexahydrophenanthrene derivatives. The reaction likely proceeds through consecutive formation of a rhodabicyclo[4.3.0] intermediate, σ‐bond metathesis between the C(sp2)−H bond on the benzene ring and the C(sp2)−RhIII bond, and isomerization between
用[RhCl(CO)2 ] 2处理苄基亚烷基取代的内部炔烃,通过C(sp 2)-H键活化产生六氢菲衍生物,实现了新型的环异构化。反应可能是通过连续生成rhodabicyclo [4.3.0]中间体,苯环上的C(sp 2)-H键与C(sp 2)-Rh III键之间的σ键复分解以及之间的异构化而进行的。根据氘化底物的实验提出了三种σ,π和σ烯丙基铑(III)物种。