Generation of metalated thiophenes with Grignard reagent and catalytic secondary amine for the cross coupling reaction with aryl halides
作者:Shota Tanaka、Daiki Tanaka、Atsushi Sugie、Atsunori Mori
DOI:10.1016/j.tetlet.2011.12.108
日期:2012.2
The reaction of thiophene derivatives with Grignard reagent (EtMgCl) and a catalytic amount of amine (Cy2NH) induced the metalation at the α-position. Following addition of several aryl halides in the presence of a nickel or palladium catalyst afforded C–H arylated products in good to excellent yields. The method was successfully applied to facile synthesis of differently-substituted 2,5-diarylthiophenes
Palladium-Catalyzed Coupling Reactions of Bromothiophenes at the C−H Bond Adjacent to the Sulfur Atom with a New Activator System, AgNO<sub>3</sub>/KF
作者:Kei Kobayashi、Atsushi Sugie、Masabumi Takahashi、Kentaro Masui、Atsunori Mori
DOI:10.1021/ol052063y
日期:2005.10.1
Bromothiophene derivatives react with aryl iodides catalyzed by a palladium complex in the presence of a silver(I) nitrate/potassium fluoride system to induce coupling at the C-H bond, while the carbon-bromine bond is intact. The produced coupling product bearing the C-Br bond allows further palladium-catalyzed C-C bond-forming reactions in reasonable yields.