Control of N-Heterocyclic Carbene Catalyzed Reactions of Enals: Asymmetric Synthesis of Oxindole-γ-Amino Acid Derivatives
作者:Xiang-Yu Chen、Jia-Wen Xiong、Qiang Liu、Sun Li、He Sheng、Carolina von Essen、Kari Rissanen、Dieter Enders
DOI:10.1002/anie.201708994
日期:2018.1.2
A strategy to control the switch between a non‐cycloaddition reaction and a cycloaddition reaction of enals, using N‐heterocyclic carbene (NHC) catalyisis, has been developed. The new scalable protocol leads to γ‐amino‐acid esters bearing a tetrasubstituted stereocenter in good yields and high stereoselectivities by homo‐Mannich reactions of enals and isatin‐derived ketimines. By simply changing the
已经开发出一种利用N杂环卡宾(NHC)催化作用来控制烯类的非环加成反应和环加成反应之间的转换的策略。新的可扩展方案可通过Enals和伊斯汀衍生的酮亚胺的均相Mannich反应,以高收率和高立体选择性产生带有四取代立体中心的γ-氨基酸酯。通过简单地将N-酮亚胺取代基更改为邻-羟基苯基,即可获得相应的螺环氧代吲哚-γ-内酰胺。