TEMPO-Catalyzed Aerobic Oxidative Selenium Insertion Reaction: Synthesis of 3-Selenylindole Derivatives by Multicomponent Reaction of Isocyanides, Selenium Powder, Amines, and Indoles under Transition-Metal-Free Conditions
作者:Huan Liu、Yi Fang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.7b03783
日期:2018.2.16
A novel and efficient approach for the selenium functionalization of indoles was developed with selenium powder as the selenium source, catalyzed by 2,2,6,6-tetramethylpiperidinooxy (TEMPO) and employing O2 as the green oxidant. This protocol provides a practical route for the synthesis of 3-selenylindole derivatives and has the advantages of readily available starting materials, mild reaction conditions
以2,2,6,6-四甲基哌啶子基氧(TEMPO)为催化剂,以O 2为绿色氧化剂,以硒粉为硒源,开发了一种新型高效的吲哚硒官能化方法。该方案提供了合成3-硒基吲哚衍生物的实用途径,并具有易于获得的起始原料,温和的反应条件和广泛的底物的优点。电子自旋共振(ESR)研究表明,该方法涉及通过原位生成的硒酸盐的氧化形成以氮为中心的自由基和硒自由基。