Chiral Hydroxytetraphenylene–Boron Complex Catalyzed Asymmetric Diels–Alder Cycloaddition of 2′-Hydroxychalcones
作者:Guo-Li Chai、Yan Qiao、Ping Zhang、Rong Guo、Juan Wang、Junbiao Chang
DOI:10.1021/acs.orglett.0c02978
日期:2020.10.16
15-Cl2-DHTP–boron complex catalyst for the asymmetric Diels–Alder cycloaddition of 2′-hydroxychalcones and dienes was developed and tested. The resulting cyclohexenes with three chiral centers were obtained in high yields (up to 98%) with excellent stereoselectivities (up to >20:1 endo/exo, >99% ee). This catalytic system features high efficiency, broad substrate scopes, and mild reaction conditions. In
(小号)-2,15-CL 2 -DHTP -硼为2'-hydroxychalcones和二烯不对称狄尔斯-阿尔德环加成配合物催化剂进行开发和测试。得到的具有三个手性中心的环己烯以高收率(高达98%)和优异的立体选择性(高达> 20:1 end / exo,> 99%ee)获得。该催化系统具有高效,广泛的底物范围和温和的反应条件的特点。另外,进行了DFT研究以解释不对称诱导的立体化学过程。