Asymmetric Allylation by Chiral Organocatalyst‐Promoted Formal Hetero‐Ene Reactions of Alkylgold Intermediates
作者:Guizhi Dong、Ming Bao、Xiongda Xie、Shikun Jia、Wenhao Hu、Xinfang Xu
DOI:10.1002/anie.202012678
日期:2021.1.25
form, and which are otherwise impossible to access. Mechanistic evidence reveals the presence of an alkylgold intermediate, and an X‐ray crystal structure of the allylgold species illuminates its unique stability and reactivity. An asymmetric formal hetero‐ene reaction of this gold intermediate, involving a dearomatization process, is enabled with assistance of a quinine‐derived squaramide catalyst. This
据报道,金和手性有机催化剂的协同催化策略可实现前所未有的伊斯汀和伊斯汀衍生的酮亚胺催化不对称烯丙基化反应。此方法可快速访问主要包含光学纯净形式的,包含邻位立体异构中心的手性2,5-二取代的亚烷基恶唑啉,否则无法访问。机理证据表明存在烷基金中间体,烯丙基金物种的X射线晶体结构阐明了其独特的稳定性和反应性。在奎宁衍生的方酰胺催化剂的辅助下,该金中间体的不对称形式的杂烯反应涉及脱芳香化过程。这一新发现扩展了金络合物的合成应用和金催化的多功能性。