A novel protocol for the synthesis of α-aryl nitriles has been successfully achieved via a copper-catalyzed cyanation of N-tosylhydrazones employing thiocyanate as the source of cyanide. The features of this method include a convenient operation, readily available substrates, low-toxicity thiocyanate salts, and a broad substrate scope.
A straightforward method for the synthesis of highlyfunctionalizedvinylarenes through palladium‐catalyzed, norbornene‐mediated CHactivation/carbene migratory insertion is described. Extension to a one‐pot procedure is also developed. Furthermore, this method can also be used to generate polysubstituted bicyclic molecules. The reaction proceeds under mild conditions to give the products in satisfactory
Pyrrolo-imidazo[1,2-<i>a</i>]pyridine Scaffolds through a Sequential Coupling of <i>N</i>-Tosylhydrazones with Imidazopyridines and Reductive Cadogan Annulation, Synthetic Scope, and Application
作者:Kena Zhang、Abderrahman El Bouakher、Helene Levaique、Jerome Bignon、Pascal Retailleau、Mouad Alami、Abdallah Hamze
DOI:10.1021/acs.joc.9b02018
日期:2019.11.1
of 3-phenyl-1H-pyrrolo-imidazo[1,2-a]pyridine backbone is described. The reaction starts from the coupling between N-tosylhydrazones and 2-chloro-3-nitroimidazo[1,2-a]pyridines leading to the formation of 3-nitro-2-(arylvinyl)imidazo[1,2-a]pyridinederivatives. Optimization of Cadogan-reductive conditions allowed the conversion of the obtained nitro derivative to a new scaffold of the type 3-aryl-
Copper-Catalyzed Direct Benzylation or Allylation of 1,3-Azoles with <i>N</i>-Tosylhydrazones
作者:Xia Zhao、Guojiao Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/ja111249p
日期:2011.3.16
Cu-catalyzed cross-coupling of N-tosylhydrazones with 1,3-azoles leads to the direct C-H benzylation or allylation. Cu carbene migratory insertion is proposed to play the key role in this transformation.
Pd-Catalyzed Highly Regio- and Stereoselective Formation of C–C Double Bonds: An Efficient Method for the Synthesis of Benzofuran-, Dihydrobenzofuran-, and Indoline-Containing Alkenes
A highly regio- and stereoselective C–C double bond formation reactionvia Pd-catalyzed Heck-type cascade process with N-tosylhydrazones has been developed. Various N-tosylhydrazones derived from both ketones and aldehydes are found to be efficient substrates to provide di- and trisubstitutedolefins with high regio- and stereoselectivity. Furthermore, this reaction has a good functional group tolerance