Rongalite-Mediated Transition Metal- and Hydride-Free Chemoselective Reduction of α-Keto Esters and α-Keto Amides
作者:Sivaparwathi Golla、Hari Prasad Kokatla
DOI:10.1021/acs.joc.2c00936
日期:2022.8.5
metal- and hydride-free protocol has been developed for the chemoselective reduction of α-keto esters and α-keto amides using rongalite as a reducing agent. Here, rongalite acts as a hydride-free reducing agent via a radical mechanism. This protocol offers the synthesis of a wide range of α-hydroxy esters and α-hydroxy amides with 85–98% yields. This chemoselective method is compatible with other reducible
已经开发了一种无过渡金属和无氢化物的方案,用于使用雕白粉作为还原剂对 α-酮酯和 α-酮酰胺进行化学选择性还原。在这里,雕白粉通过自由基机制充当无氢化物的还原剂。该协议提供了多种 α-羟基酯和 α-羟基酰胺的合成,产率为 85-98%。这种化学选择性方法与其他可还原的官能团兼容,例如卤化物、烯烃、酰胺和腈。使用廉价的雕白粉(约0.03 美元/1 g)、温和的反应条件和克级合成是该方法的一些关键特征。此外,已以 79% 的产率合成了克级规模的血管扩张药物 cyclandelate。