aminolysis reaction between various aryl esters and inert tertiaryamines by C–O and C–N bond activations has been developed for the selective synthesis of a broad scope of tertiary amides under neutral and mild conditions. The mechanism may undergo the two key steps of oxidativeaddition of acyl C–O bond in parent ester and C–N bond cleavage of tertiaryamine via an iminium-type intermediate.
CuO-decorated magnetite-reduced graphene oxide: a robust and promising heterogeneous catalyst for the oxidative amidation of methylarenes in water <i>via</i> benzylic sp<sup>3</sup> C–H activation
activity of the rGO/Fe3O4–CuO nanocomposite was probed in the direct oxidative amidation reaction of methylarenes with free amines. Various aromatic and aliphatic amides were prepared efficiently at room temperature from cheap raw chemicals using tert-butyl hydroperoxide (TBHP) as a “green” oxidant and low-toxicity TBAI in water. This method combines the oxidation of methylarenes and amide bond formation
Amide Synthesis by Nickel/Photoredox‐Catalyzed Direct Carbamoylation of (Hetero)Aryl Bromides
作者:Nurtalya Alandini、Luca Buzzetti、Gianfranco Favi、Tim Schulte、Lisa Candish、Karl D. Collins、Paolo Melchiorre
DOI:10.1002/anie.202000224
日期:2020.3.23
Herein, we report a one‐electron strategy for catalytic amide synthesis that enables the direct carbamoylation of (hetero)aryl bromides. This radical cross‐coupling approach, which is based on the combination of nickel and photoredox catalysis, proceeds at ambient temperature and uses readily available dihydropyridines as precursors of carbamoyl radicals. The method's mild reaction conditions make
Photoinduced Site-Selective C(sp<sup>3</sup>)–H Chlorination of Aliphatic Amides
作者:Yanshuo Zhu、Jingcheng Shi、Wei Yu
DOI:10.1021/acs.orglett.0c03297
日期:2020.11.20
Herein, we report a newphotochemical method for C(sp3)–H chlorination of amides which employs tert-butyl hypochlorite as the chlorinating agent and a household compact fluorescent lamp as the light source. The reaction proceeds via N-heterocyclic carbene SIPr·HCl-promoted N–H chlorination and subsequent photoinduced Hofmann–Löffler–Freytag chlorine atom transfer. The latter process is facilitated
Ruthenium-catalyzed oxidative decyanative cross-coupling of acetonitriles with amines in air: a general access to primary to tertiary amides under mild conditions
Catalyzed by Ru and in the presence of air and nucleophiles such as amines or ammonia, activation of the C–CN bond could be easily achieved under mild conditions to produce primary to tertiary amides in good to excellent yields. The use of accessible and functional-group-tolerant starting materials, a cheap, low-loading and recyclable catalyst, ligand-free conditions and excellent product yields are