CuI/Oxalamide Catalyzed Couplings of (Hetero)aryl Chlorides and Phenols for Diaryl Ether Formation
作者:Mengyang Fan、Wei Zhou、Yongwen Jiang、Dawei Ma
DOI:10.1002/anie.201601035
日期:2016.5.17
Couplings between (hetero)arylchlorides and phenols can be effectively promoted by CuI in combination with an N‐aryl‐N′‐alkyl‐substituted oxalamide ligand to proceed smoothly at 120 °C. For this process, N‐aryl‐N′‐alkyl‐substituted oxalamides are more effective ligands than bis(N‐aryl)‐substituted oxalamides. A wide range of electron‐rich and electron‐poor aryl and heteroaryl chlorides gave the corresponding
The first palladium‐catalyzed protocol for the denitrated coupling reaction of nitroarenes with phenols has been developed, achieving unsymmetrical diaryl ethers in moderate to excellent yields. The cyclopalladatedferrocenylimine (catalyst Ic) exhibited highly catalytic activity for this transformation with low catalyst loading (0.75 mol%) and short reaction time (2 h). The efficiency of this reaction
Electrochemical Reductive Smiles Rearrangement for C–N Bond Formation
作者:Xihao Chang、Qinglin Zhang、Chang Guo
DOI:10.1021/acs.orglett.8b03178
日期:2019.1.4
A conceptually new and synthetically valuable radical Smiles rearrangement reaction is reported under undivided electrolytic conditions. This protocol employs an entirely new strategy for the electrochemical radical Smiles rearrangement. Remarkably, an amidyl radical generated from the cleavage of the N–O bond under reductive electrolytic conditions plays a crucial role in this transformation. Various
A study of the gas-phase interconversion of 1-(2-aryloxyphenyl)alkaniminyl and 2-(aryliminomethyl)phenoxyl radicals
作者:Michael Black、J. I. G. Cadogan、Rino Leardini、Hamish McNab、Graham McDougald、Daniele Nanni、David Reed、Alberto Zompatori
DOI:10.1039/a800884a
日期:——
Flashvacuumpyrolysis of the allylethers 9–11 and of the oxime ethers 15–17 at 650 °C (5 × 10–2–5 × 10–3 Torr) generates 2-(aryliminomethyl)phenoxyl radicals 4 and 1-(2-aryloxyphenyl)alkaniminyl radicals 5 respectively which can interconvert via a spirodienyl radical leading to common products which are generally isolated in low to moderate yield. The iminyls 5 normally undergo β-cleavage leading
Copper-Catalyzed Diaryl Ether Formation from (Hetero)aryl Halides at Low Catalytic Loadings
作者:Yuntong Zhai、Xiaofei Chen、Wei Zhou、Mengyang Fan、Yisheng Lai、Dawei Ma
DOI:10.1021/acs.joc.7b00493
日期:2017.5.5
Diaryl formation is achieved by coupling phenols and (hetero)aryl halides under the catalysis of CuI/N,N′-bis(2-phenylphenyl) oxalamide (BPPO) or CuI/N-(2-phenylphenyl)-N′-benzyl oxalamide (PPBO) at 90 °C using DMF or MeCN as the solvent. Only 0.2–2 mol % CuI and ligand are required for complete conversion, which represents the lowest catalytic loadings for a general Cu/ligand-catalyzed diaryl ether