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
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.