Abstract A selective protocol for the synthesis of either α -ketoamides or quinoxaline derivatives under the same reaction conditions has been achieved simply by varying substitution number of amino-groups. The method features metal-free, room temperature and broad substrate scopes as well as no extra oxidant. This process applies to various substituent groups and gives products in moderate to good
An efficient and practical method was developed for the synthesis of tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones based on the decarboxylative cyclization reaction of α-ketoamides and proline. In most cases, tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones were obtained with perfect diastereoselectivity to give trans-isomer in excellent yield.
基于α-酮酰胺与脯氨酸的脱羧环化反应,开发了一种高效,实用的四氢-1 H-吡咯并[1,2 - a ]咪唑-2-酮的合成方法。在大多数情况下,以完美的非对映选择性获得四氢-1 H-吡咯并[1,2- a ]咪唑-2-酮,从而以优异的收率得到反式异构体。
Friedel–Crafts Hydroxyalkylation of Indoles with α-Keto Amides using Reusable K<sub>3</sub>PO<sub>4</sub>/<i>n</i>Bu<sub>4</sub>NBr Catalytic System in Water
作者:Alagesan Muthukumar、Govindasamy Sekar
DOI:10.1021/acs.joc.8b00844
日期:2018.8.17
in water as solvent through a solid–liquid interface formation. The transition-metal-free protocol does not demand column chromatography purification and results in highly pure indole fused α-hydroxy amides in good to excellent yields. Reusability of the catalytic system up to five cycles and extension to a gram-scale reaction are the key advantages of this transformation. The mechanisticstudy involving
通过使用固-液界面形成水中的催化量的K 3 PO 4和n Bu 4 NBr作为溶剂,首次开发了一种温和且操作简单的吲哚与α-酮酰胺的弗瑞德-克来夫斯羟烷基化方法。不含过渡金属的方案不需要柱色谱纯化,并且可以以高至优异的收率得到高纯度的吲哚稠合的α-羟基酰胺。这种转化的关键优势是催化系统最多可重复使用五个循环并扩展至克级反应。涉及1 H NMR实验的机理研究表明,反应是通过离子交换途径进行的。
Visible-light initiated copper(<scp>i</scp>)-catalysed oxidative C–N coupling of anilines with terminal alkynes: one-step synthesis of α-ketoamides
Development of C–N coupling processes is fundamentally important and challenging for the synthesis of biologically active molecules and drugs. Herein, we report a highly atom efficient green process for the synthesis of α-ketoamides via visible-light induced copper(I) chloride catalysed direct oxidative Csp–N coupling reactions using commercially available alkynes and anilines at room temperature without
Synthesis of 1,2-Fused Bicyclic Imidazolidin-4-ones by Redox-Neutral Cyclization Reaction of Cyclic Amines and α-Ketoamides
作者:Jiashou Wu、Yi Liu、Zhengneng Jin、Huajiang Jiang
DOI:10.1055/s-0036-1591951
日期:2018.5
A redox annulation reaction of cyclic amines and α-ketoamides was developed. A variety of 1,2-fused bicyclic imidazolidin-4-ones were synthesized in moderate to good yields from cyclic amines by redox-neutral α-C–H functionalization.