novel and efficient method for the synthesis of α-ketoamides, employing a dimethyl sulfoxide (DMSO)-promoted oxidative amidation reaction between 2-oxoaldehydes and amines under metal-free conditions is presented. Furthermore, mechanistic studies supported an iminium ion-based intermediate as a central feature of reaction wherein C1-oxygen atom of α-ketoamides is finally derived from DMSO.
UV Assisted High‐Efficient Synthesis of α‐Ketoamides using Air Promoted by A Non‐Metal Catalyst in Aqueous Solution
作者:Jianhui Li、Shaopo He、Kuan Zhang、Ziyi Quan、Qiheng Shan、Zhongliang Sun、Bo Wang
DOI:10.1002/cctc.201801365
日期:2018.11.7
(λ=210 nm) promoted procedure proceeding in aqueous media at room temperature using ambient air as the oxidant for efficient synthesis of an array of α‐ketoamides of all types using a non‐metal catalyst N‐iodosuccinimide with a loading of 20 mol%. With UV, oxygen in the air was efficiently utilized as the green oxidant, some control experiments were carried out and a plausible mechanism was proposed
An effective green synthesis of α-ketoamides was developed for the first time in water via gold nanoparticles (AuNPs) catalyzedaerobicoxidative cross-dehydrogenative coupling of secondary amines with phenylglyoxals with a broad substrate scope.
Aminocatalytic Cross-Coupling Approach via Iminium Ions to Different CC Bonds
作者:Nagaraju Mupparapu、Narsaiah Battini、Satyanarayana Battula、Shahnawaz Khan、Ram A. Vishwakarma、Qazi Naveed Ahmed
DOI:10.1002/chem.201405477
日期:2015.2.9
on the ability of such iminium cations to promote reactions via an iminium‐catalyzed or iminium‐equivalent pathway are apparently unavailable. Previously, tandem cross‐coupling reactions were reported, in which an iminium ion undergoes nucleophilic 1,2‐addition to give a putative three‐component intermediate that abstracts a proton in situ and undergoes self‐deamination followed by unprecedented DMSO/aerobic
Solvent-free one-pot oxidation of ethylarenes for the preparation of α-ketoamides under mild conditions
作者:Fuyan Liu、Kuan Zhang、Yanfeng Liu、Shan Chen、Yiping Chen、Dela Zhang、Chunfu Lin、Bo Wang
DOI:10.1039/c6ra26679g
日期:——
Here we developed a highly efficient solvent-free, one-pot procedure for synthesizing α-ketoamides from ethylarenes and amines, by oxidizing a C–H bond sp3 center. A copper catalyst was employed, and the reactions proceeded smoothly at ambient temperatures. Most of the tested ethylarenes and amines were successfully converted to their corresponding α-ketoamides in moderate to excellent yields of up