Pairing Iron and Nickel Catalysis for Electrochemical Esterification of Aryl Halides with Carbazates
作者:Peng Xue、Liubo Li、Niankai Fu
DOI:10.1021/acs.orglett.2c03034
日期:2022.10.21
for esterification of aryl halides by pairing iron and nickel electrocatalysis. The reaction involves anodically iron-catalyzed oxidation of carbazates to produce alkoxycarbonyl radicals. The carbon-centered radicals then enter nickel catalysis that is powered by cathodic reduction to deliver the radical coupling products. Mechanistic data are consistent with arylnickel(II) species as the key intermediates
我们报告了一种通过配对铁和镍电催化来酯化芳基卤化物的电催化方法。该反应涉及阳极铁催化的氨基甲酸酯氧化以产生烷氧羰基自由基。然后,以碳为中心的自由基进入由阴极还原驱动的镍催化,以提供自由基偶联产物。机械数据与芳基镍 (II) 物种一致,它们是能够形成所需碳-碳键的关键中间体。
Nickel-Catalyzed Transesterification of Methyl Esters
作者:Stephen G. Newman、Yan-Long Zheng、Omid Daneshfar、Jia-Yi Li、Jeanne Masson-Makdissi、Émile Pinault-Masson
DOI:10.1055/s-0042-1751485
日期:2024.5
transesterification of methyl esters with aliphatic alcohols was developed using Ni/dcype catalysis. This reaction features the cleavage of the strong C(acyl)–OMe bond in the absence of acidic or basic additives, providing volatile methanol as the only stoichiometric waste product. A wide range of (hetero)aromatic and aliphatic methyl esters can be converted into the corresponding functionalized esters in good to excellent
Electrochemical Trifluoromethoxylation of (Hetero)aromatics with a Trifluoromethyl Source and Oxygen
作者:Yao Ouyang、Xiu‐Hua Xu、Feng‐Ling Qing
DOI:10.1002/anie.202114048
日期:2022.1.17
A conceptually new trifluoromethoxylation reaction through the combination of readily available trifluoromethylating reagent and oxygen under electrochemical conditions was developed. The synthetic utility of this new protocol is illustrated by the C−H trifluoromethoxylation of (hetero)arenes and biorelevant molecules.
Reverse Regioselective Cp*Co(III)-Catalyzed [4 + 2] C–H Annulation of <i>N</i>-Chloroamides with Vinylsilanes: Synthesis of 4-Silylated Isoquinolones and Their Synthetic Utilities
作者:Arijit Ghosh、Tamanna Rana、Nilanjan Bhaduri、Amit B. Pawar
DOI:10.1021/acs.orglett.3c03115
日期:2023.11.3
have developed a Cp*Co(III)-catalyzed reverse regioselective [4 + 2] annulation of N-chlorobenzamides/acrylamides with vinylsilanes for the synthesis of 4-silylated isoquinolones. The reaction was performed at ambient temperature under redox-neutral conditions. The reaction utilized the N–Cl bond as an internal oxidant, furnished the required products with excellent regioselectivities, and demonstrated