Mechanistic Studies on a Cooperative NHC Organocatalysis/Palladium Catalysis System: Uncovering Significant Lessons for Mixed Chiral Pd(NHC)(PR<sub>3</sub>) Catalyst Design
作者:Chang Guo、Daniel Janssen-Müller、Mirco Fleige、Andreas Lerchen、Constantin G. Daniliuc、Frank Glorius
DOI:10.1021/jacs.7b00462
日期:2017.3.29
detailed investigation of the catalytically active palladiumspecies pointed toward a dual role of the NHC acting as an organocatalyst and forming a novel mixed ligand Pd/NHC/phosphine complex. The catalytically active Pd/NHC/phosphine complex represents a new class of chiralpalladium catalyst. Remarkably, phosphine plays a crucial role in this transformation. These complexes could be characterized by
The first example of iron‐catalyzed decarboxylative (4+1) cycloaddition reactions is described in this publication. By using this method, a wide range of functionalized indoline products were prepared from easily available vinyl benzoxazinanones and sulfur ylides in high yields and selectivities. A possible reaction pathway involving an allylic iron intermediate is discussed based on a series of control