Transition-Metal-Promoted Oxidative Cyclization To Give 1,2,4-Trisubstituted Carbazole Scaffolds
作者:Milena Szewczyk、Małgorzata Ryczkowska、Sławomir Makowiec
DOI:10.1055/s-0039-1690681
日期:2019.12
Herein, we describe the synthesis of a 1,2,4-trisubstituted carbazole core from 5-(1H-indol-3-yl)-3-oxopentanoic acid esters or amides. For oxidative cyclization, we tested two different approaches. First, we used manganese triacetate as a conventional moderate oxidizer to ensure the radical course of the reaction. Second, we examined the use of a more complex oxidizing agent I2/Me(OTf)3. In both cases
在本文中,我们描述了由5-(1 H-吲哚-3-基)-3-氧戊酸酸酯或酰胺合成1,2,4-三取代咔唑核。对于氧化环化,我们测试了两种不同的方法。首先,我们使用三乙酸锰作为常规的中度氧化剂,以确保反应的自由基进程。其次,我们检查了更复杂的氧化剂I 2 / Me(OTf)3的使用。在两种情况下,均观察到形成具有2-羟基和1-羧基取代基的稠环咔唑体系。结合意外反应中间体的形成,讨论了该方法的机械方面。