Photochemical Organocatalytic Synthesis of Thioethers from Aryl Chlorides and Alcohols
作者:Shuo Wu、Thomas Hin-Fung Wong、Paolo Righi、Paolo Melchiorre
DOI:10.1021/jacs.3c13900
日期:2024.2.7
Thioethers, often found in pharmaceuticals and natural compounds, typically involve metal cross-coupling reactions, high temperatures, and the use of disagreeable thiols for their synthesis. Here we present a straightforward, thiol-free organocatalytic protocol that uses mild conditions to stitch together inexpensive alcohols and aryl chlorides, yielding a diverse array of aryl alkyl thioethers. Central
硫醚通常存在于药物和天然化合物中,通常涉及金属交叉偶联反应、高温以及在合成过程中使用不适宜的硫醇。在这里,我们提出了一种简单的、无硫醇的有机催化方案,该方案使用温和的条件将廉价的醇和芳基氯化物缝合在一起,产生多种芳基烷基硫醚。该方法的核心是发现四甲基硫脲可以作为拦截光化学产生的芳基自由基的简单硫源。为了形成自由基,我们使用了一种现成的吲哚硫醇盐有机催化剂,当用 405 nm 光激发时,它会获得强烈的还原能力,从而能够通过单电子转移激活通常不反应的芳基氯化物。硫脲的自由基捕获,随后通过极性路径的醇攻击,导致硫醚产物的形成。