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
8,11-Dichloro-<i>N</i>-tosyl-3-aza[5]metacyclophane: A Highly Strained Aromatic System
作者:Daniël S. van Es、Arne Egberts、Stephen Nkrumah、Hans de Nijs、Willem H. de Wolf、Friedrich Bickelhaupt、Nora Veldman、Anthony L. Spek
DOI:10.1021/ja9634987
日期:1997.1.1
Van Es, Daniel S.; Van Eis, Maurice J.; N'krumah, Stephen, Heterocycles, 2001, vol. 54, # 2, p. 799 - 824
作者:Van Es, Daniel S.、Van Eis, Maurice J.、N'krumah, Stephen、Gret, Norbert、Egberts, Arnet、De Rijke, Marianne、De Kanter, Franciscus J.J.、De Wolf, Willem H.、Bickelhaupt, Friedrich、Spek, Anthony L.