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.
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...
Ring-expanded N-heterocyclic carbenes as ligands in iron-catalysed cross-coupling reactions of arylmagnesium reagents and aryl chlorides
作者:Qiaoqiao Teng、Wenqin Wu、Hung A. Duong、Han Vinh Huynh
DOI:10.1039/c8cc01808a
日期:——
aryl–aryl coupling reaction was explored. This was achieved by comparing the catalytic performance of Fe-NHC catalysts generated in situ containing NHCs that differ in steric bulk. In particular, the influences of ring sizes (5–8) and N-aryl substituents were explored in terms of spectroscopic and structural features, which affect their %Vbur values. The three best performing ligands were found on a diagonal
P(i-BuNCH2CH2)3N: an efficient promoter for the microwave synthesis of diaryl ethers
作者:Steven M. Raders、John G. Verkade
DOI:10.1016/j.tetlet.2008.03.089
日期:2008.5
of aryl fluorides with aryl TBDMS ethers under microwave conditions gave moderate to high yields of the desired products at low catalyst loadings and in short times. In this methodology, electron deficient aryl fluorides possessing substituents, such as nitro, cyano, and ester, were coupled with sterically demanding aryl TBDMS ethers as well as with aryl TBDMS ethers bearing a variety of functionalities
P(<i>i</i>-BuNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N: An Efficient Promoter for the Nucleophilic Aromatic Substitution Reaction of Aryl Fluorides with Aryl TBDMS (or TMS) Ethers
作者:Sameer Urgaonkar、John G. Verkade
DOI:10.1021/ol051108s
日期:2005.7.1
[reaction: see text]. The nucleophilic aromatic substitution reaction between electron-deficient aryl fluorides and aryl TBDMS (or TMS) ethers has been shown to be efficiently promoted by proazaphosphatranes such as P(i-BuNCH(2)CH(2))(3)N (3). Excellent yields of diaryl ether products were obtained under unusually mild conditions.