A CO<sub>2</sub>-Catalyzed Transamidation Reaction
作者:Yang Yang、Jian Liu、Fadhil S. Kamounah、Gianluca Ciancaleoni、Ji-Woong Lee
DOI:10.1021/acs.joc.1c02077
日期:2021.12.3
Transamidation reactions are often mediated by reactive substrates in the presence of overstoichiometric activating reagents and/or transition metal catalysts. Here we report the use of CO2 as a traceless catalyst: in the presence of catalytic amounts of CO2, transamidation reactions were accelerated with primary, secondary, and tertiary amide donors. Various amine nucleophiles including amino acid
在过量化学计量的活化试剂和/或过渡金属催化剂的存在下,转酰胺基反应通常由反应性底物介导。在这里,我们报告了使用 CO 2作为无痕催化剂:在催化量的 CO 2存在下,使用伯、仲和叔酰胺供体加速转酰胺反应。包括氨基酸衍生物在内的各种胺类亲核试剂都被耐受,这表明转酰胺基在肽修饰和聚合物降解中的实用性(例如,Nylon-6,6)。特别是,N , O -二甲基羟基酰胺(Weinreb 酰胺)在 CO 2催化的转酰胺基反应中与 N 2相比表现出明显的反应性大气层。进行了比较 Hammett 研究和动力学分析,以阐明分子 CO 2的催化活化机制,这得到了 DFT 计算的支持。我们将CO 2在转酰胺基反应中的积极作用归因于通过与亲电子CO 2共价结合来稳定四面体中间体。
CuO-decorated magnetite-reduced graphene oxide: a robust and promising heterogeneous catalyst for the oxidative amidation of methylarenes in water <i>via</i> benzylic sp<sup>3</sup> C–H activation
activity of the rGO/Fe3O4–CuO nanocomposite was probed in the direct oxidative amidation reaction of methylarenes with free amines. Various aromatic and aliphatic amides were prepared efficiently at room temperature from cheap raw chemicals using tert-butyl hydroperoxide (TBHP) as a “green” oxidant and low-toxicity TBAI in water. This method combines the oxidation of methylarenes and amide bond formation
<i>N</i>-Acylbenzotriazoles: Neutral Acylating Reagents for the Preparation of Primary, Secondary, and Tertiary Amides
作者:Alan R. Katritzky、Hai-Ying He、Kazuyuki Suzuki
DOI:10.1021/jo000792f
日期:2000.12.1
Readily available N-acylbenzotriazoles 2a-q efficiently acylate aqueous ammonia and primary and secondaryamines to give primary, secondary, and tertiary amides in good to excellent yields. The wide applicability of the procedure is illustrated by the preparation of (i) alpha-hydroxyamides from alpha-hydroxy acids and of (ii) perfluoroalkylated amides.
Practical Synthesis of Amides via Copper/ABNO-Catalyzed Aerobic Oxidative Coupling of Alcohols and Amines
作者:Susan L. Zultanski、Jingyi Zhao、Shannon S. Stahl
DOI:10.1021/jacs.6b03931
日期:2016.5.25
A modular Cu/ABNO catalystsystem has been identified that enables efficient aerobic oxidative coupling of alcohols and amines to amides. All four permutations of benzylic/aliphatic alcohols and primary/secondary amines are viable in this reaction, enabling broad access to secondary and tertiary amides. The reactions exhibit excellent functional group compatibility and are complete within 30 min-3
The present invention concerns the use of a furfural derivative of formula (I)
in which R represents (i) a —CH═CR′
1
—COR
1
group, a group
a group
a group
or a —CHO and R′ represents a hydrogen atom or a (C
1
-C
4
)alkyl group, as a chemical vehicle, as a solvent, co-solvent, coalescing agent, crystallization inhibitor, plasticising agent, degreasing agent, etchant, cleaning agent or agent for increasing biological activity, and more particularly as a solvent.
It also concerns phytosanitary formulations or resin-solubilising formulations comprising at least one such furfural derivative of formula (I).