Coupling of Methyl Ketones and Primary or Secondary Amines Leading to α-Ketoamides
作者:Wei Wei、Ying Shao、Huayou Hu、Feng Zhang、Chao Zhang、Yuan Xu、Xiaobing Wan
DOI:10.1021/jo301117b
日期:2012.9.7
A metal-free oxidative coupling of methyl ketones and primary or secondary amines to α-ketoamides has been developed. Four intermediates, α-iodoketone, α-aminoketone, iminium intermediate, and α-hydroxy amine have been identified through a series of control experiments. The atom-economic methodology can be scaled-up, tolerates a variety of functional groups, and is operationally simple.
A phosphine-free Pd catalyst for the selective double carbonylation of aryl iodides
作者:Verónica de la Fuente、Cyril Godard、Ennio Zangrando、Carmen Claver、Sergio Castillón
DOI:10.1039/c2cc17124d
日期:——
The first phosphine-free Pd-catalysed double carbonylation of aryl iodides is reported as a general and practical method, giving excellent conversions and selectivities for a wide range of aryl iodides and amine nucleophiles under atmospheric CO pressure.
Iodobenzene derivatives possessing various substituents (amino, hydroxy, tert-butyl, methyl, isopropyl, phenyl, fluoro, chloro, methoxycarbonyl, acetyl, trifluoromethyl, nitro) in the para position were aminocarbonylated using tert-butylamine and n-butylamine as N-nucleophiles. A palladium(0) catalyst formed in situ from palladium(II) acetate and triphenylphosphine was used. Carboxamide and ketocarboxamide
A novel approach for the one-pot preparation of α-ketoamides by anodic oxidation
作者:Zhenlei Zhang、Jihu Su、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c3cc43685c
日期:——
The direct oxidative synthesis of α-ketoamides via anodic oxidation was developed by using dioxygen as a reactant under mild conditions. This methodology has a broad substrate scope (aromatic amines, aliphatic amines and ammonium acetate) and opens up an interesting and attractive avenue for the synthesis of α-ketoamide derivatives.
A copper-catalyzed cascade reaction for selective aerobic oxidative C−C bond cleavage of β-alkyl nitroolefins and subsequent oxidative amidation with amines or amides was reported. The reaction all exhibited high selectivities and gave the corresponding α-ketoamides with 66–88% yields. The mechanistic study revealed that the NO2-directed aerobic oxidative C−C bond cleavage occurred on more electron-rich