Efficienttransamidation of unactivated carboxamides, phthalimides, formamides and thioamides with amines undersolvent-freeconditions using H-β-zeolite as a green and recyclable heterogeneous catalyst is described. Easy work up, high purity of the products, recyclability and environmentally-friendly nature of the catalyst are the attractive features of the present methodology. This is the first report
Graphene Oxide: A Metal‐Free Carbocatalyst for the Synthesis of Diverse Amides under Solvent‐Free Conditions
作者:Khushbu P. Patel、Eknath M. Gayakwad、Vilas V. Patil、Ganapati S. Shankarling
DOI:10.1002/adsc.201801673
日期:2019.4.23
solvent‐free reaction conditions providing desired products in good to excellent yields. The one‐pot synthesis of 2,3‐Dihydro‐5H‐benzo[b]‐1,4‐thiazepin‐4‐one moiety by GO catalyzed Aza Michael addition followed by intramolecular transamidation is also described. A plausible reaction mechanistic pathway involving H‐bonding is discussed. The graphene oxide can be recycled and reused up to five cycles without
α-Imino acids, prepared from α-ketoacids and primary amines, undergo facile decarboxylation to the corresponding imines on heating at ⩽,80°C in benzene or methylene chloride. Decarboxylation proceeds via a 1,2-ylide which can be trapped by sulphur to give the corresponding secondary thioamides in good yield. 1,2-Ylides from secondary amines and ∞-keto acids can be generated in situ and trapped with
An efficient iodine-mediated multipathway coupled domino reaction has been developed for the synthesis of thiobenzamides from benzylamines, benzylamines/aldehydes, and N-alkyl benzylamines under the same reaction conditions. This approach combines two consecutive domino processes in one pot using iodine as the oxidant.
selective, efficient, and simple method for direct transamidation of thioamides with amines, promoted by commercially available acetophenone under metal-/solvent-free conditions. The reaction tolerated a wide range of functional groups and substrates, including single- or double-thioamides, benzylamines, or alkyl/cycloalkyl-substituted aliphatic amines. The present protocol can be applied to gram-scale in