Design of an Electron-Withdrawing Benzonitrile Ligand for Ni-Catalyzed Cross-Coupling Involving Tertiary Nucleophiles
作者:L. Reginald Mills、Racquel K. Edjoc、Sophie A. L. Rousseaux
DOI:10.1021/jacs.1c05281
日期:2021.7.14
The design of new ligands for cross-coupling is essential for developing new catalytic reactions that access valuable products such as pharmaceuticals. In this report, we exploit the reactivity of nitrile-containing additives in Ni catalysis to design a benzonitrile-containing ligand for cross-coupling involving tertiary nucleophiles. Kinetic and Hammett studies are used to elucidate the role of the
设计用于交叉偶联的新配体对于开发获得有价值产品(如药物)的新催化反应至关重要。在本报告中,我们利用含腈添加剂在 Ni 催化中的反应性来设计含苄腈的配体,用于涉及三级亲核试剂的交叉偶联。动力学和哈米特研究用于阐明优化配体的作用,这表明苄腈部分充当电子受体,以促进还原消除而不是 β-氢化物消除并稳定低价镍。在这些条件下,进行了脱氰-金属化和镍催化芳基化的方案,从而能够从双取代丙二腈中获得四元 α-芳基腈。
Copper-catalyzed cyanation of arenes using benzyl nitrile as a cyanide anion surrogate
作者:Jisong Jin、Qiaodong Wen、Ping Lu、Yanguang Wang
DOI:10.1039/c2cc35046g
日期:——
The copper-catalyzedcyanation of arenes using benzyl nitrile as a cyanide anion surrogate furnishes aromatic nitriles in moderate to good yields. The cascade process involves a copper-catalyzed aerobic C-Hoxidation, a retro-cyanohydrination, and a copper-catalyzed aerobic oxidativeC-H functionalization.
Cut and paste! A Cu‐catalyzed aromaticCHcyanation with acetonitrile as the nitrile source by CCNcleavage has been developed (see scheme; TMEDA=N,N,N′,N′‐tetramethylethylenediamine). The reaction is catalytic in copper, and it is found that using (Me3Si)2 as an additive plays a critical role in promoting CCNcleavage and enhancing the reaction rate.
A palladium(II)/magnesium–lanthanummixedoxide (Pd(II)/Mg–La) catalyst is a reusable catalyst for cyanation of aromatic C–H bonds by using the combination of NH4HCO3 and DMSO as the ‘‘CN’’ source. Moderate to good yields of aromatic nitriles were obtained. An excellent regioselectivity was achieved using the present protocol. A tandem process involving Suzuki coupling followed by a cyanation reaction
Cobalt-Catalyzed CH Cyanation of Arenes and Heteroarenes
作者:Jie Li、Lutz Ackermann
DOI:10.1002/anie.201409247
日期:2015.3.16
Carboxylate assistance proved to be the key for the success of efficient cobalt(III)‐catalyzedCH cyanations. Thus, an in situ generated cationic cobalt complex was identified as a versatile catalyst for the site‐selective synthesis of various aromatic and heteroaromatic nitriles with ample substrate scope.