Palladium‐Catalyzed Carboxy‐Alkynylation of Propargylic Amines Using Carbonate Salts as Carbon Dioxide Source
作者:Phillip D. G. Greenwood、Jerome Waser
DOI:10.1002/ejoc.201900500
日期:2019.9
A palladium‐catalyzed multicomponent reaction of propargylic amines, alkynyl bromides and cesium hydrogen carbonate to access oxazolidinones is reported. In contrast to previous reports, only a slight excess of cesium hydrogen carbonate is used as a surrogate of carbondioxide. The reaction gives access to oxazolidinones bearing alkyl‐ and aryl polysubstituted enynes in good yield and very high E stereoselectivity
The designed AIO catalyst, uniquely featuring co-coordination with AcGlu and bis(benzimidazolium) units at the Pd center. The structure promotes the formation of NHC-CO2 and AcGlu-CO2 with a TOF of 3456 h−1 in reaction of CO2 and propargylic amine.