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.
Über Aminale und Halbaminale von α-Ketoaldehyden 43. Mitt. über α-halogenierte Amine
作者:H. Böhme、Y. S. Sadanandam
DOI:10.1002/ardp.19733060309
日期:——
α‐Ketoaldehyden 1 und 1 Mol sekundärem Amin entstehen die Halbaminale 4, die durch Dehydrierung in Glyoxylsäureamide 6 übergehen. Aminale 5 sind durch Kondensation von α‐Ketoaldehyden 1 mit 2 Mol. oder durch Umsetzung von α,α‐Dichlorketonen 2 mit 4 Mol. sekundärem Amin zugänglich, sie werden durch Acetylchlorid zu α‐halogenierten Aminen 8 gespalten. Durch Kondensation von α,α‐Dichloraceton und 2 Mol. Dimethylamin
novel tandem metal-free oxidative aryl migration/C–Cbond-cleavage reaction, mediated by hypervalent iodine reagent, has been discovered. The presented transformation provided straightforward access to important α-ketoamide and α-ketoester derivatives from readily available acrylic derivatives via a concerted process of 1,2-aryl shift concomitant with C–C bond cleavage.
Aryl-palladium-NHC complex: efficient phosphine-free catalyst precursors for the carbonylation of aryl iodides with amines or alkynes
作者:Chunyan Zhang、Jianhua Liu、Chungu Xia
DOI:10.1039/c4ob01878h
日期:——
aryl-palladium-NHC compounds was prepared according to the reported methods and their catalytic activity in the carbonylation of aryl iodides to synthesize α-keto amides and alkynones was examined. These practical aryl-palladium-NHC complexes have shown highly efficient catalyzed carbonylation and Sonogashira carbonylation reactions, with high turnover number in synthesis of α-keto amides (TON = 4300) and in synthesis
TBHP/I2-promoted oxidative coupling of acetophenones with amines at room temperature under metal-free and solvent-free conditions for the synthesis of α-ketoamides
作者:Xiaobin Zhang、Lei Wang
DOI:10.1039/c2gc35489f
日期:——
A novel and efficient TBHP/I2-promoted oxidative coupling reaction of acetophenones with amines for the synthesis of α-ketoamides has been developed. The reactions proceeded smoothly at room temperature under metal-free and solvent-free conditions and generated the corresponding products in good yields.