3‐(Methoxycarbonyl)Cyclobutenone as a Reactive Dienophile in Enantioselective Diels–Alder Reactions Catalyzed by Chiral Oxazaborolidinium Ions
作者:Peng Yan、Changxu Zhong、Jie Zhang、Yu Liu、Huayi Fang、Ping Lu
DOI:10.1002/anie.202014308
日期:2021.2.23
Cyclobutenone has been used as a highly reactivedienophile in Diels–Alder reactions, however, no enantioselective example has been reported. We disclose herein a chiral oxazaborolidine‐aluminum bromide catalyzed enantioselective Diels–Alder reaction of 3‐alkoxycarbonyl cyclobutenone with a variety of dienes. Furthermore, a total synthesis of (−)‐kingianin F was completed for the first time via enantioenriched