Selective Kumada biaryl cross-coupling reaction enabled by an iron(iii) alkoxide–N-heterocyclic carbene catalyst system
作者:Yi-Yuan Chua、Hung A. Duong
DOI:10.1039/c4cc02930e
日期:——
A catalyst system comprising Fe2(OtBu)6 and an N-heterocyclic carbene ligand enables efficient syntheses of (hetero)biaryls from the reactions of aryl Grignard reagents with a diverse spectrum of (hetero)aryl chlorides. Amongst the alkoxide and amide counterions investigated, tert-butoxide was the most effective in inhibiting the homocoupling of arylmagnesiums.
An efficient chlorination of indoles and electron‐rich arenes with chlorine anion as nucleophile is described. With the use of ethyl phenyl sulfoxide as the promoter, the reaction went smoothly under metal‐free and mild conditions. Various indoles and electron‐rich arenes are converted into the corresponding chlorinated compounds in moderate to excellent yields. A plausible interrupted Pummerer reaction
Iron(<scp>ii</scp>) triflate/N-heterocyclic carbene-catalysed cross-coupling of arylmagnesiums with aryl chlorides and tosylates
作者:Yi-Yuan Chua、Hung A. Duong
DOI:10.1039/c5cc08302h
日期:——
In comparison to iron(II) halides, iron(II) triflate exhibits a greater resistance towards reduction by p-tolylmagnesium bromide. This knowledge led to the development of an iron(II) triflate/N-heterocyclic carbene-catalysed cross-coupling of aryl...