The Suzuki−Miyaura cross-coupling of aryl phosphates using Ni(PCy3)2Cl2 as an inexpensive, bench-stable catalyst is described. Broad substrate scope and high efficiency are demonstrated by the syntheses of more than 40 biaryls and by constructing complex organic molecules. The poor reactivity of aryl phosphates relative to aryl halides is successfully employed to construct polyarenes by selective cross-coupling
Nickel-Catalyzed Heteroarenes Cross Coupling via Tandem C–H/C–O Activation
作者:Ting-Hsuan Wang、Ram Ambre、Qing Wang、Wei-Chih Lee、Pen-Cheng Wang、Yuhua Liu、Lili Zhao、Tiow-Gan Ong
DOI:10.1021/acscatal.8b03436
日期:2018.12.7
Inert aryl methyl ethers as coupling components via C–O activation have been established with a Ni catalyst for C–H activation of heteroarene. The key to simultaneous C–H/C–O bond activation is the use of sterically demanding o-tolylMgBr. The protocol is effective for a wide scope of substrates including naphthyl methyl ethers, anisoles, and a variety of other heteroarene derivatives. Detailed mechanistic
direct cross‐coupling reaction between diarylzinc (Ar2Zn) and aryltrimethylammonium salts (ArNMe3+⋅−OTf) in the presence of LiCl, via C−N bond cleavage. The reaction takes place smoothly upon heating in THF without any external catalyst, enabling an efficient and chemoselective formation of biaryl products. Mechanistic studies indicate that the reaction proceeds through a single electrontransfer route
N,S-chelating triazole-thioether ligand for highly efficient palladium-catalyzed Suzuki reaction
作者:Qiong Yan、Lei Zheng、Miaomiao Li、Yunfeng Chen
DOI:10.1016/j.jcat.2019.07.004
日期:2019.8
1,2,3-Triazole-thioether compounds could serve as efficient ligands for Pd-catalyzed Suzuki reactions of various aryl iodides, bromides and chlorides. The reactions feature wide substrate scope and mild reaction conditions. Besides, shorter reaction time, lower catalyst loadings and quantitative yields with a turnover-frequency (TOF) value of up to 11,880 h−1 are other advantageous of this attractive
1,2,3-三唑-硫醚化合物可以用作钯催化的各种芳基碘化物,溴化物和氯化物的Suzuki反应的有效配体。该反应具有广泛的底物范围和温和的反应条件。此外,更短的反应时间,更低的催化剂载量和定量产率(TOF)值高达11,880 h -1的定量收率是该引人注目的方案的其他优点。晶体结构分析和计算研究表明,相应的螯合钯配合物的较高催化活性归因于较低的能隙和较低的氧化还原电势。