Visible‐Light‐Induced C2 Alkylation of Heterocyclic N‐Oxides with N‐Hydroxyphthalimide Esters under Metal‐Free Conditions
作者:Pi‐Tao Qin、Jing Sun、Fei Wang、Jing‐Yun Wang、He Wang、Ming‐Dong Zhou
DOI:10.1002/adsc.202000517
日期:2020.11.4
heterocyclic N‐oxides with N‐hydroxyphthalimide esters was developed using Eosin Y as the photocatalyst in the presence of Cs2CO3 under redox‐neutral and mild conditions. Using N‐hydroxyphthalimide esters as the radical precursors, quinoline and pyridine N‐oxides were readily coupled with a wide range of primary, secondary, and tertiary radicals to afford the desired alkylated heterocyclic N‐oxides in moderated
使用曙红Y作为光催化剂,在Cs 2 CO 3存在下,开发了可见光诱导的杂环N-氧化物与N-羟基邻苯二甲酰亚胺酯的CH选择性烷基化烷基化反应在氧化还原中性和温和条件下。使用N-羟基邻苯二甲酰亚胺酯作为自由基前体,喹啉和吡啶N-氧化物易于与各种伯,仲和叔基团偶联,以中等至极好的收率提供所需的烷基化杂环N-氧化物。重要的是,该反应方案还成功证明了其在糖基或生物活性天然脱氢松香酸含杂环N-氧化物以及药物和农用化学活性烷基化奎宁基功能分子(潜在的抗疟药)的构建中的应用。