Evolution of
<i>N</i>
‐Heterocycle‐Substituted Iodoarenes (NHIAs) to Efficient Organocatalysts in Iodine(I/III)‐Mediated Oxidative Transformations
作者:Andreas Boelke、Boris J. Nachtsheim
DOI:10.1002/adsc.201901356
日期:2020.1.7
The reactivity of ortho‐functionalized N‐heterocycle‐substituted iodoarenes (NHIAs) as organocatalysts in iodine(I/III)‐mediated oxidations was systematically investigated in the α‐tosyloxylation of ketones as the model reaction. During a systematic catalyst evolution, it was found that NH‐triazoles and benzoxazoles have the most significant positive influence on the reactivity of the central iodine
的反应性的邻位-官能化ñ -杂环取代iodoarenes(NHIAs),如碘(I / III)介导的氧化反应是在系统地研究有机催化剂α酮作为模型反应的-tosyloxylation。在系统的催化剂进化过程中,发现NH-三唑和苯并恶唑对中心碘原子的反应性具有最显着的积极影响。催化剂的进一步改进集中在芳烃的取代模式上,显示出显着的邻位效应。通过引入一个o- OMe基团,我们能够生成一种新型的NHIA,其催化效率目前还没有发现。这种新的催化剂不仅易于合成,而且还可以报告的最低催化剂负载量仅为1 mol%时,羰基化合物的α-甲苯磺酰氧基化。最后,该碘(I)催化剂的性能已在联苯的分子内氧化偶合和氧化重排中得到了成功证明。