Organocatalytic Atroposelective Intramolecular [4+2] Cycloaddition: Synthesis of Axially Chiral Heterobiaryls
作者:Yidong Liu、Xiaoyan Wu、Shan Li、Lu Xue、Chunhui Shan、Zhengxing Zhao、Hailong Yan
DOI:10.1002/anie.201801824
日期:2018.5.28
The enantioselective construction of axially chiral aryl‐naphthopyran skeletons was realized by organocatalytic atroposelective intramolecular [4+2] cycloaddition of in situ generated vinylidene ortho‐quinone methides, from 2‐ethynylphenol derivatives, with alkynes. Through this method, the heteroatropisomers were obtained with excellent yields and enantioselectivities. Moreover, a speculative model