Robust Buchwald–Hartwig amination enabled by ball-milling
作者:Qun Cao、William I. Nicholson、Andrew C. Jones、Duncan L. Browne
DOI:10.1039/c8ob01781f
日期:——
An operationally simple mechanochemical method for the Pd catalysed Buchwald–Hartwig amination of arylhalides with secondary amines has been developed using a Pd PEPPSI catalyst system.
[Pd(IPr*<sup>OMe</sup>)(cin)Cl] (cin = Cinnamyl): A Versatile Catalyst for C–N and C–C Bond Formation
作者:Gulluzar Bastug、Steven P. Nolan
DOI:10.1021/om500026s
日期:2014.3.10
Buchwald–Hartwig cross-coupling reactions of stericallydemanding aryl chlorides with sterically hindered and deactivated aniline derivatives. This catalyst also proved efficient in Suzuki–Miyaura reactions, thus allowing the preparation of tetra-ortho-substitutedbiaryls. The Kumada–Corriu coupling has also been investigated using this palladium N-heterocyclic carbene (NHC) catalyst.
A simple synthetic entryway into palladium cross-coupling catalysis
作者:Caroline M. Zinser、Fady Nahra、Marcel Brill、Rebecca E. Meadows、David B. Cordes、Alexandra M. Z. Slawin、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1039/c7cc02487h
日期:——
The simple synthesis of a family of palladates containing an imidazolium counterion is presented. These “ate” complexes can be easily converted into well-defined palladium–N-heterocyclic carbene (NHC) complexes. The synthetic protocols leading to the “ate” and to the Pd–NHC neutral complexes have been exemplified with various NHC ligands. The palladates prove efficient pre-catalysts enabling Suzuki–Miyaura
Mechanochemical Activation of Zinc and Application to Negishi Cross-Coupling
作者:Qun Cao、Joseph L. Howard、Emilie Wheatley、Duncan L. Browne
DOI:10.1002/anie.201806480
日期:2018.8.27
A form independent activation of zinc, concomitant generation of organozinc species and engagement in a Negishi cross‐coupling reaction via mechanochemical methods is reported. The reported method exhibits a broad substrate scope for both C(sp3)–C(sp2) and C(sp2)–C(sp2) couplings and is tolerant to many important functional groups. The method may offer broad reaching opportunities for the in situ generation
Direct C-H bond (Hetero)arylation of thiazole derivatives at 5-position catalyzed by N-heterocyclic carbene palladium complexes at low catalyst loadings under aerobic conditions
synthesis of 5-(hetero)arylated thiazole derivatives via an N-heterocyclic carbene palladium (Pd-NHC) complex catalyzed directC-Harylation reaction. Utilization of this methodology, the arylation of substituted thiazoles with (hetero)aryl bromides efficiently proceeded at low catalyst loading (0.1–0.05 mol%) and under aerobic conditions. A variety of (hetero)aryl bromides, even some strongly deactivated