Diaryl Ether Formation Merging Photoredox and Nickel Catalysis
作者:Le Liu、Cristina Nevado
DOI:10.1021/acs.organomet.1c00018
日期:2021.7.26
Photoredox and Ni catalysis are combined to produce diaryl ethers under mild conditions. A broad range of aryl halides and phenol derivatives are cross-coupled in the presence of a readily available organic photocatalyst and NiBr2(dtbpy). Symmetrical diaryl ethers have also been directly obtained from aryl bromides in the presence of water. Mechanistic investigations support the involvement of Ni(0)
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
been studied from aryl bromide and phenol/aryl disulfide/diselenide substrates. A series of unsymmetrical diaryl chalcogenides were accessedfrom aryl bromide and diaryl dichalcogenide precursors by using 2.5 equiv of potassium tert-butoxide in DMSO at 80 °C. Unsymmetrical diaryl ethers were also obtained by using phenol precursors at 40–45 °C. Aryl bromides with methyl, trifluoromethyl, methoxy and
The aromatic difluoromethyl group (Ar-CFH) is an emerging functional group found in pharmaceutical compounds. For synthesis, the hydrodefluorination of Ar-CF molecules is a straightforward approach in terms of atom economy and substrate scope. The reported hydrodefluorination reaction focused on the Ar-CF substrate bearing electron-withdrawing groups. In this report, we utilized electricity as the
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