cross-coupling or aryl halides is widely employed in the synthesis of many important molecules in synthetic chemistry, including pharmaceuticals, polymers and functional materials. Herein, we disclose the first palladium-catalyzed decarbonylative Suzuki-Miyaura cross-coupling of amides for the synthesis of biaryls through the selectiveactivation of the N-C(O) bond of amides. This new method relies on
Enhancing Metalating Efficiency of the Sodium Amide NaTMP in Arene Borylation Applications
作者:Leonie J. Bole、Andreu Tortajada、Eva Hevia
DOI:10.1002/anie.202204262
日期:2022.6.27
The non-nucleophilic amide NaTMP, in combination with PMDETA and B(OiPr)3 have allowed the deprotonative borylation of unactivated arenes under mild conditions. The study of its reaction pathway and the characterisation of the intermediates by X-Ray crystallography and 1H DOSY enabled the development of this protocol, which forms boronates in a direct and easy way, enabling Suzuki–Miyaura couplings
非亲核酰胺 NaTMP 与 PMDETA 和 B(O i Pr) 3结合,可以在温和条件下对未活化的芳烃进行去质子硼酸化。通过对其反应途径的研究以及通过 X 射线晶体学和1 H DOSY 对中间体进行表征,促成了该方案的开发,该方案以直接、简单的方式形成硼酸酯,使 Suzuki-Miyaura 偶联能够以有效的方式获得联芳基化合物。
Copper + Nickel-in-Charcoal (Cu−Ni/C): A Bimetallic, Heterogeneous Catalyst for Cross-Couplings
作者:Bruce H. Lipshutz、Danielle M. Nihan、Ekaterina Vinogradova、Benjamin R. Taft、Žarko V. Bošković
DOI:10.1021/ol801676u
日期:2008.10.2
catalyst composed of copper and nickel oxide particles supported within charcoal has been developed. It catalyzes cross-couplings that traditionally use palladium, nickel, or copper, including Suzuki-Miyaura reactions, Buchwald-Hartwig aminations, vinylalane alkylations, etherifications of arylhalides, arylhalide reductions, asymmetric conjugate reductions of activated olefins, and azide-alkyne "click"
Selective hydrogenolysis of C-CN bonds can allow chemists to take advantage of ortho-directing ability, alpha-C-H acidity and electron withdrawing ability of the cyano group for synthetic manipulations. We have discovered hydrogenolysis of aryl and aliphatic cyanides under just 1 bar of hydrogen by using a nickel catalyst. This protocol was applied in the aryl cyanide directed functionalization reaction