Enantioselective Gold(I)-Catalyzed Heterocyclization–Intermolecular Exo [4 + 3]-Cycloaddition Reactions for the Synthesis of Chiral Oxa-Bridged Benzocycloheptanes
作者:Xiaoyu Di、Yidong Wang、Lizuo Wu、Zhan-Ming Zhang、Qiang Dai、Wenbo Li、Junliang Zhang
DOI:10.1021/acs.orglett.9b00537
日期:2019.5.3
The highly exo- and enantioselective gold-catalyzed tandem heterocyclization/[4 + 3] cycloaddition of 2-(1-alkynyl)-2-alken-1-ones and 1,3-diphenylisobenzofuran was implemented by utilizing Ming-Phos, which provides a facile access to chiral seven-membered oxa-bridged rings in 80–98% yield with high exo selectivity (exo/endo up to 50:1) and up to 97% ee.
高度外切-和对映选择性金催化串联heterocyclization / [4 + 3] 2-(1-炔基)环加成-2-链烯-1-酮和1,3- diphenylisobenzofuran通过利用明-PHOS实现,其提供了容易获得手性七元氧杂桥环,产率为80-98%,具有高的外切选择性(外切/内切高达50:1)和ee高达97%。