Amination with Pd–NHC Complexes: Rate and Computational Studies on the Effects of the Oxidative Addition Partner
作者:Ka Hou Hoi、Selçuk Çalimsiz、Robert D. J. Froese、Alan C. Hopkinson、Michael G. Organ
DOI:10.1002/chem.201002988
日期:2011.3.7
Pd‐PEPPSI‐IPent, a recently‐developed N‐heterocyclic carbene (NHC) complex, has been evaluated in amination reactions with secondary amines and it has shown superb reactivity under the most mildly basic reaction conditions. Rate and computationalstudies were conducted to provide insight into the mechanism of the transformation. The IPent catalyst coordinates to the amine much more strongly than the
[Pd(IPr*<sup>OMe</sup>)(acac)Cl]: Tuning the N-Heterocyclic Carbene in Catalytic C–N Bond Formation
作者:Sebastien Meiries、Klaus Speck、David B. Cordes、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1021/om3011867
日期:2013.1.14
A new N-heterocyclic ligand IPr*(OMe) [N,N'-bis(2,6-bis(diphenylmethyl)-4-methoxyphenyl)imidazol-2-ylidene] has been synthesized and compared with its earlier methyl-substituted congener IPr* [N,N'-bis(2,6-bis(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene]. IPr*(OMe) was successfully bound to palladium, and the catalytic activity of the resulting complex [Pd(IPr*(OMe))(acac)Cl] was investigated in Buchwald-Hartwig arylamination. Catalytic activity was compared to that of [Pd(IPr*)(acac)Cl].