A Highly Active Catalyst for Pd-Catalyzed Amination Reactions: Cross-Coupling Reactions Using Aryl Mesylates and the Highly Selective Monoarylation of Primary Amines Using Aryl Chlorides
作者:Brett P. Fors、Donald A. Watson、Mark R. Biscoe、Stephen L. Buchwald
DOI:10.1021/ja8055358
日期:2008.10.15
reactivity for C-N cross-coupling reactions is reported. This catalyst system enables the use of arylmesylates as a coupling partner in C-N bond-forming reactions. Additionally, the use of BrettPhos permits the highly selective monoarylation of an array of primary aliphatic amines and anilines at low catalyst loadings and with fast reaction times, including the first monoarylation of methylamine. Lastly
Ni(<sup>4-tBu</sup>stb)<sub>3</sub>: A Robust 16-Electron Ni(0) Olefin Complex for Catalysis
作者:Lukas Nattmann、Josep Cornella
DOI:10.1021/acs.organomet.0c00485
日期:2020.9.28
Sixteen-electron Ni(0) complexes bearing trans-stilbene derivative ligands have been shown to display a high degree of stability toward oxidation in the solid state. A structural analysis of a unique family of tris Ni(0) stilbene complexes revealed a remarkable effect of the sterichindrance of the substituents at the para position of the stilbene unit to temperature, oxidation, and degradation in solution
Aryl chlorides are converted to aniline derivatives using catalytic amounts of Ni(COD)2 (COD = 1,5-cyclooctadiene) and DPPF (DPPF = 1,1‘-bis(diphenylphosphino)ferrocene) or 1,10-phenanthroline in the presence of sodium tert-butoxide. This procedure has a broad substrate scope: electron-rich or electron-poor aryl chlorides, as well as chloropyridine derivatives, can be combined with primary and secondary
Ligands for Transition-Metal-Catalyzed Cross-Couplings, and Methods of Use Thereof
申请人:Buchwald Stephen L.
公开号:US20090221820A1
公开(公告)日:2009-09-03
Ligands for transition metals are disclosed herein, which may be used in various transition-metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The disclosed methods provide improvements in many features of the transition-metal-catalyzed reactions, including the range of suitable substrates, number of catalyst turnovers, reaction conditions, and efficiency. For example, improvements have been realized in transition-metal-catalyzed cross-coupling reactions.
Ligands for transition-metal-catalyzed cross-couplings, and methods of use thereof
申请人:Massachusetts Institute of Technology
公开号:US07858784B2
公开(公告)日:2010-12-28
Ligands for transition metals are disclosed herein, which may be used in various transition-metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The disclosed methods provide improvements in many features of the transition-metal-catalyzed reactions, including the range of suitable substrates, number of catalyst turnovers, reaction conditions, and efficiency. For example, improvements have been realized in transition-metal-catalyzed cross-coupling reactions.