Palladium-Catalyzed Cyanation Reactions of Thiophene Halides
作者:Thomas Erker、Stephanie Nemec
DOI:10.1055/s-2003-42490
日期:——
The described method provides an efficient cyanation reaction of thiophene halides using tris(dibenzylidene-acetone)dipalladium(0), 1,1′-bis-(diphenylphosphino)ferrocene) and zinc powder as the catalyst system and Zn(CN)2 as the cyanide source. Several thiophenes with various substituents are effectively cyanated under these conditions.
The nucleophilic aromatic substitution of hydrogen through electrochemical oxidation of the intermediate sigma complexes (Meisenheimer complexes) in simple nitroaromatic compounds is reported for the first time. The studies have been carried out with hydride and cyanide anions as the nucleophiles using cyclic voltammetry (CV) and preparative electrolysis. The cyclic voltammetry experiments allow for