Catalytic asymmetric [2+2] cycloaddition between quinones and fulvenes and a subsequent stereoselective isomerization to 2,3-dihydrobenzofurans
作者:Haifeng Zheng、Chaoran Xu、Yan Wang、Tengfei Kang、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1039/c7cc03211k
日期:——
The catalytic enantioselective [2+2] cycloaddition between quinones and fulvenes was achieved, for the first time, by the use of a chiral copper(II) complex catalyst. The transformation afforded a series of enantiomerically enriched [6,4,5]-tricyclic cyclobutane derivatives in good yields with excellent regio- and stereoselectivities. Furthermore, the [2+2] adducts could be easily converted into formal
通过使用手性铜(II)络合物催化剂,首次实现了醌与富烯之间的催化对映选择性[2 + 2]环加成反应。该转化以良好的产率提供了一系列对映异构体富集的[6,4,5]-三环环丁烷衍生物,具有优异的区域选择性和立体选择性。此外,[2 + 2]加合物可以轻松有效地和立体选择性地转化为正式的[3 + 2]加合物。