Catalytic Enantioselective Ynamide Additions to Isatins: Concise Access to Oxindole Alkaloids
作者:Max Moskowitz、Christian Wolf
DOI:10.1002/anie.201814074
日期:2019.3.11
catalyzed by a bisoxazolidine copper complex under mild, base‐free reaction conditions, is described. The reaction is broad in scope, scalable, applicable to unprotected isatins, and provides efficient access to 3‐hydroxyoxindoles carrying a tetrasubstituted chiral center with excellent yields and enantioselectivities. Synthetically versatile, multifunctional 3‐hydroxyindolinones are obtained by hydration
描述了在轻度,无碱的反应条件下,由双恶唑烷铜配合物催化的对多种Isatins高末端选择性对映体的加成反应。该反应适用范围广,可扩展,适用于未保护的靛红,可高效获得带有四取代手性中心的3-羟基羟吲哚,并具有优异的收率和对映选择性。通过在室温下水合,部分氢化或将乙酰胺基部分进行羟基氢化,羟基化和彻底氢化,再进行还原性脱甲苯磺酸化和自发环化,即可获得合成的多功能3-羟基吲哚酮,从而制得氰菊酰胺生物碱。