Method of forming a carbon-carbon or carbon-heteroatom linkage
申请人:Taillefer Marc
公开号:US20050234239A1
公开(公告)日:2005-10-20
The invention relates to a method of creating a carbon-carbon or carbon-heteroatom linkage by reacting an unsaturated compound bearing a leaving group and a nucleophilic compound. More specifically, the invention relates to the creation of a carbon-nitrogen linkage involving the arylation of nitrogenous organic derivatives. The inventive method consists in creating a carbon-carbon or carbon-heteroatom linkage by reacting an unsaturated compound bearing a leaving group and a nucleophilic compound providing a carbon atom or a heteroatom (HE) capable of being substituted for the leaving group, thereby creating a C—C or C-HE linkage. The invention is characterised in that the reaction is carried out in the presence of an effective quantity of a catalyst based on copper and at least one ligand comprising at least one imine function and at least one additional nitrogen atom as chelating atoms
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)
Surfactant-free, single-nano-sized copper nanoparticles (Cu NPs) (size: about 2 nm) were prepared by the DMF reduction method. The Cu NPs showed high catalytic activity (with a turnover number (TON) of up to 2.2 × 104) in Ullmann-type cross-coupling of aryl halides with phenols under ligand-free conditions.
be efficiently performed by means of catalytic amounts of copper iodide and the inexpensive ligand 1 (structure given in Table 1). The reaction is applicable to a wide range of substrates and proceeds at 60–80 °C, the lowest temperatures reported to date for an Ullmann-type synthesis of diarylethers. Moreover, the use of aryl bromides and inexpensive K3PO4 as base make this method attractive for applications
苯酚和芳基溴化物的偶联可通过催化量的碘化铜和廉价的配体1(表1中给出的结构)有效地进行。该反应适用于多种底物,反应温度为60–80°C,这是迄今为止报道的Ullmann型二芳基醚合成的最低温度。此外,使用芳基溴化物和廉价的K 3 PO 4作为碱使得该方法对于工业规模的应用具有吸引力。