Rhodium-Catalyzed Oxidative Amidation of Sterically Hindered Aldehydes and Alcohols
作者:Trang T. Nguyen、Kami L. Hull
DOI:10.1021/acscatal.6b02541
日期:2016.12.2
has been developed with sterically hindered aldehydes and alcohols for the synthesis of amides containing a quaternary carbon at the α position. A variety of amine nucleophiles, both aliphatic and aromatic, are employed and afford the corresponding amides in good to excellent yields. Finally, mechanistic studies are performed to gain insight into both catalytic cycles.
[2+2+2] Annulation of N-(1-Naphthyl)acetamide with Two Alkynoates via Cleavage of Adjacent C–H and C–N Bonds Catalyzed by an Electron-Deficient Rhodium(III) Complex
non-oxidative [2+2+2] annulation of N-(1-naphthyl)acetamide with two alkynoates via cleavage of the adjacent C–H and C–N bonds to give densely substituted phenanthrenes undermildconditions (at 40 °C under air). In this reaction, a dearomatized spiro compound was isolated, which may support the formation of a cationic spiro rhodacycle intermediate in the catalytic cycle. The use of N-(1-naphthyl)acetamide in
Efficient and selective hydrogenation of C–O bonds with a simple sodium formate catalyzed by nickel
作者:Xiaoxiang Xi、Tieqiao Chen、Ji-Shu Zhang、Li-Biao Han
DOI:10.1039/c7cc08709h
日期:——
A Ni-catalyzed hydrogenation of C–O compounds with sodium formate is developed. Various esters, i.e. aryl, alkenyl, benzyl pivalates, and even the arylethers, were efficiently reduced with a loading of nickel catalysts down to 0.5 mol%. Reactive functional groups such as C–C double bonds, carbonyl, CN, MeS and halogen groups are tolerable. This reaction can be used for the modification of complex
Pd-Catalyzed Intermolecular <i>ortho</i>-C−H Amidation of Anilides by <i>N</i>-Nosyloxycarbamate
作者:Ka-Ho Ng、Albert S. C. Chan、Wing-Yiu Yu
DOI:10.1021/ja106364r
日期:2010.9.22
A palladium-catalyzed ortho-C-H amidation of anilides by N-nosyloxycarbamates was developed for the synthesis of 2-aminoanilines. This reaction can be carried out under relatively mildconditions and exhibits excellent regioselectivity and functional group tolerance. The amidation reaction is probably initiated by rate-limiting C-H cyclopalladation (k(H)/k(D) = 3.7) to form an arylpalladium complex
General rhodium-catalyzed oxidative cross-coupling reactions between anilines: synthesis of unsymmetrical 2,2′-diaminobiaryls
作者:Yang Shi、Jiahui Liu、Yudong Yang、Jingsong You
DOI:10.1039/c9cc01733j
日期:——
cross-coupling reactions. Furthermore, this Cp*-free catalytic reaction tolerates a range of functional groups and requires only a low molar ratio of coupling partners. These features expedite the synthesis of unsymmetrical2,2′-diaminobiaryls.