A one pot diazo installation-photochemical oxidation (blue LED-O2)/ amidation of aryl/heteroaryl acetates with cyclic 2°-amines: An eco-friendly synthesis of aromatic α-ketoamides
作者:Debajit Maiti、Tejas Prabakar、Poushaly Ghosh、Subhabrata Sen
DOI:10.1016/j.tet.2022.133043
日期:2022.10
are also frequently used as building blocks for the synthesis of heterocyclic scaffolds. Herein we have reported an eco-friendly synthesis of aromatic-α-ketoamides. It is a one pot synthesis beginning from alkyl aryl/heteroaryl acetates 7a - k with various cyclic secondary amines 8a - c in molecular oxygen as the oxidant via diazo installation-oxidation-amidation in ethyl acetate as solvent with a 5–6 W
芳香族-α-酮酰胺是一类有趣的分子。它们具有无数的生物学特性,也经常用作合成杂环支架的构件。在此,我们报道了芳香族-α-酮酰胺的环保合成。它是从烷基芳基/杂芳基乙酸酯7a - k与各种环状仲胺8a - c在分子氧中作为氧化剂开始的一锅法合成,通过重氮安装-氧化-酰胺化在乙酸乙酯中作为溶剂,使用带有蓝色 LED 灯(435-445 nm)的 5-6 W 微型光化学反应器对目标化合物进行反应。该反应也可以在没有氧化剂的情况下在空气中进行,但这有助于主要形成不需要的 NH 插入产物。在氧气气氛下,此类副产物的形成减少到 10-20%。各种芳香族-α-酮酰胺10a - x以中等至高产率合成。对照实验为转化机制提供了合理的依据。该协议可以按克级放大。
A general metal free approach to α-ketoamides via oxidative amidation–diketonization of terminal alkynes
作者:Ramesh Deshidi、Manjeet Kumar、Shekaraiah Devari、Bhahwal Ali Shah
DOI:10.1039/c4cc03783a
日期:——
A metal free catalytic system employing TMSOTf/I2/DMSO for the oxidative amidation–diketonization of terminal alkynes, in order to produce a wide variety of α-ketoamides, has been developed.