NHC–Gold(I) Complexes as Effective Catalysts for the Carboxylative Cyclization of Propargylamines with Carbon Dioxide
作者:Shun Hase、Yoshihito Kayaki、Takao Ikariya
DOI:10.1021/om400949m
日期:2013.10.14
NHC–gold(I) complexes promote carboxylative cyclization of a range of propargylic amines to afford (Z)-5-alkylidene-1,3-oxazolidin-2-ones in methanol under neutral and mild conditions. The highly active and robust catalyst permits CO2 utilization under a mixed gas atmosphere containing CO or H2. As a key intermediate, a new alkenylgold(I) complex was successfully identified from a stoichiometric reaction
Mechanistic Aspects of the Carboxylative Cyclization of Propargylamines and Carbon Dioxide Catalyzed by Gold(I) Complexes Bearing an<i>N</i>-Heterocyclic Carbene Ligand
作者:Shun Hase、Yoshihito Kayaki、Takao Ikariya
DOI:10.1021/acscatal.5b01335
日期:2015.9.4
introduction of aromatic substituents at the alkyne terminus. The formation of alkenylgold(I) complexes as catalytic intermediate models is demonstrated by the treatment of methyl- and phenyl-substituted propargylamines with AuOH(IPr) under a CO2 atmosphere. A comparison of the reactivity of the alkenylgold(I) complexes clearly indicates that the alkenyl ligand attached to an alkyl group at the α position