Observation of Sequential Electrophilic Substitution of Bromothiophene and Immediate Reductive Elimination of Arylpalladium Complexes
作者:Atsushi Sugie、Kei Kobayashi、Yuji Suzaki、Kohtaro Osakada、Atsunori Mori
DOI:10.1246/cl.2006.1100
日期:2006.10
The reaction of aryl(iodo)palladium(II)(bpy) complex with 2,3-dibromothiophene in the presence of AgNO3/KF as an activator induces CH arylation in 64–78% yields. These results suggest that palladium-catalyzed CH arylation of bromothiophene derivatives proceeds through the electrophilic substitution of aryl(iodo)palladium(II) complex triggered by AgNO3/KF to form the aryl(thienyl)palladium(II) complex, which readily undergoes reductive elimination to give the CH arylation product.
Electrophilic Substitution of Thiophenes with Arylpalladium(II) and Platinum(II) Complexes: Mechanistic Studies on Palladium-Catalyzed CH Arylation of Thiophenes
作者:Atsushi Sugie、Hirotoshi Furukawa、Yuji Suzaki、Kohtaro Osakada、Munetaka Akita、Daiki Monguchi、Atsunori Mori
DOI:10.1246/bcsj.82.555
日期:2009.5.15
Mechanisticstudies on palladium-catalyzed CH arylation of thiophenes which has been shown by our group are carried out by a stoichiometric reaction of organometallic complexes. The reaction of arylpalladium(II) halide with 2,3-dibromothiophene in the presence of AgNO 3 /KF as an activator induces electrophilic substitution at the CH bond of the thiophene to give CH arylated product. The similar reaction
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.