Nitrosoacetylenes have been prepared by the reaction of nitrosyl chloride with metal acetylides in solution at low temperatures. The nitroso-compounds undergo complex rearrangements when the solution is allowed to warm to room temperature. The nature of two of these rearrangements has been elucidated.
Facile Synthesis of Phosphaamidines and Phosphaamidinates using Nitrilium Ions as an Imine Synthon
作者:Tom van Dijk、Sebastian Burck、Mark K. Rong、Amos J. Rosenthal、Martin Nieger、J. Chris Slootweg、Koop Lammertsma
DOI:10.1002/anie.201405027
日期:2014.8.18
Readily accessible nitrilium triflates are convenient imine building blocks for the expedient synthesis of a novel class of 1,3‐P,N ligands as demonstrated for the reaction with primary phosphanes. This procedure allows variation of all substituents. X‐ray crystal structures are reported for nitrilium ions, phosphaamidines, and three phosphaamidinate complexes. The lithium phosphaamidinate is N coordinated
A Meta-Selective Copper-Catalyzed C–H Bond Arylation
作者:Robert J. Phipps、Matthew J. Gaunt
DOI:10.1126/science.1169975
日期:2009.3.20
For over a century, chemical transformations of benzenederivatives have been guided by the high selectivity for electrophilic attack at the ortho/para positions in electron-rich substrates and at the meta position in electron-deficient molecules. We have developed a copper-catalyzed arylation reaction that, in contrast, selectively substitutes phenyl electrophiles at the aromatic carbon–hydrogen sites
Electron Transfer Chain Reactions in the Alkylation of Isonitriles by Alkylmercury Halides.
作者:Glen A. Russell、Ragine Rajaratnam、Ping Chen、Olle Matsson、Jadwiga Trocha-Grimshaw、Ole Hammerich、Inger Søtofte、Bengt Långström
DOI:10.3891/acta.chem.scand.52-0528
日期:——
Imidoyl (PhN=CR.) or acyl (RCO.) radicals undergo electron transfer to alkylmercury halides in Me2SO or PhH solution. Addition of t-Bu-. or i-Pr-. to isonitriles followed by electron transfer forms the nitrilium ion which is converted into the amide in Me2SO; into the imidoyl halide in PhH, and into the amidine in PhH solution containing primary or secondary amines.
Amine Activation: Synthesis of <i>N</i>-(Hetero)arylamides from Isothioureas and Carboxylic Acids
作者:Yan-Ping Zhu、Sergey Sergeyev、Philippe Franck、Romano V. A. Orru、Bert U. W. Maes
DOI:10.1021/acs.orglett.6b02247
日期:2016.9.16
A novel method for N-(hetero)arylamide synthesis based on rarely explored amine activation, rather than classical acid activation, is reported. The activated amines are easily prepared using a three-component reaction with commercial reagents. The new method shows a broad scope including challenging amides not (efficiently) accessible via classical protocols.