An efficient oxidative coupling protocol for amide formation has been developed. Various tertiary amines and aromatic aldehydes were oxidized to their corresponding tertiary amides in moderate to good yields in the presence of a simple nBu4NI-catalyst.
已经开发了用于酰胺形成的有效的氧化偶联方案。在简单的n Bu 4 NI催化剂存在下,各种叔胺和芳族醛以中等到良好的收率被氧化成它们相应的叔酰胺。
Chemoselective α,β‐Dehydrogenation of Saturated Amides
作者:Christopher J. Teskey、Pauline Adler、Carlos R. Gonçalves、Nuno Maulide
DOI:10.1002/anie.201808794
日期:2019.1.8
We report a method for the selective α,β‐dehydrogenation of amides in the presence of other carbonyl moieties under mild conditions. Our strategy relies on electrophilic activation coupled to in situ selective selenium‐mediated dehydrogenation. The α,β‐unsaturated products were obtained in moderate to excellent yields, and their synthetic versatility was demonstrated by a range of transformations.
我们报告了一种在温和条件下在其他羰基存在下选择性 α,β-脱氢酰胺的方法。我们的策略依赖于亲电激活与原位选择性硒介导的脱氢作用相结合。α,β-不饱和产物以中等至优异的收率获得,并且它们的合成多功能性通过一系列转化得到证明。机理实验表明亲电子 Se IV物质的形成。
Amide Bond Formation Catalyzed by Recyclable Copper Nanoparticles Supported on Zeolite Y under Mild Conditions
A series of catalysts based on supportedcoppernanoparticles have been prepared and tested in the amide bond formation from tertiary amines and acid anhydrides, in the presence of tert‐butyl hydroperoxide as an oxidant. Coppernanoparticles on zeolite Y (CuNPs/ZY) was found to be the most efficient catalyst for the synthesis of amides, working in acetonitrile as solvent, under ligand‐ and base‐free
α‐modification of amides is still a challenge because of the low acidity of α‐CH groups. The α‐functionalization of N−H (primary and secondary) amides, containing both an unactived α‐C−H bond and a competitively active N−H bond, remains elusive. Shown herein is the general and efficient oxidative α‐oxyamination and hydroxylation of aliphaticamides including secondary N−H amides. This transition‐metal‐free
Vinyl-λ<sup>3</sup>-iodanes act as efficient sulfur atom acceptors: vinylic S<sub>N</sub>2-based strategy for conversion of tertiary thioamides to amides
作者:Masahito Ochiai、Shinji Yamamoto
DOI:10.1039/b209097j
日期:——
Exposure of tertiary thioamides to (E)-1-hexenyl(phenyl)-λ3-iodane results in vinylic SN2 reaction to give the inverted (Z)-S-vinylthioimidonium salts, which under alkaline hydrolysis (Na2CO3 or K2CO3) selectively afford amides, while (Z)-S-vinyl thioesters are obtained in high yields via the hydrolysis under acidic conditions (HCl).