Highly Chemoselective Deoxygenation of N-Heterocyclic <i>N</i>-Oxides Using Hantzsch Esters as Mild Reducing Agents
作者:Ju Hyeon An、Kyu Dong Kim、Jun Hee Lee
DOI:10.1021/acs.joc.0c02805
日期:2021.2.5
Herein, we disclose a highly chemoselective room-temperature deoxygenation method applicable to various functionalized N-heterocyclic N-oxides via visible light-mediated metallaphotoredox catalysis using Hantzsch esters as the sole stoichiometric reductant. Despite the feasibility of catalyst-free conditions, most of these deoxygenations can be completed within a few minutes using only a tiny amount
在此,我们公开了适用于各种官能化的N-杂环N的高度化学选择性的室温脱氧方法。通过使用Hantzsch酯作为唯一的化学计量还原剂的可见光介导的金属光氧化还原催化而生成二氧化氮。尽管无催化剂条件可行,但大多数脱氧反应仅需使用少量催化剂即可在几分钟内完成。即使在极低的催化剂负载量为0.01 mol%的情况下,该技术也可以进行多克级反应。此可扩展且操作方便的方案的范围涵盖了广泛的官能团,例如酰胺,氨基甲酸酯,酯,酮,腈基,硝基和卤素,它们可以很好地接触到相应的脱氧N-杂环产量(总共45个实例的平均产量为86.8%)。