Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles
作者:Loïc R. E. Pantaine、John A. Milligan、Jennifer K. Matsui、Christopher B. Kelly、Gary A. Molander
DOI:10.1021/acs.orglett.9b00602
日期:2019.4.5
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkyl radicals possessing pendant leaving groups engage imines in C–C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers
光氧化还原介导的自由基/极性交叉(RPC)过程为环状分子的合成提供了新途径。该过程已实现用于构建中型饱和氮杂环。光催化产生的具有侧离去基团的烷基自由基与亚胺形成C-C键,随后中间氮中心自由基的还原引发阴离子闭环。借助可见光照射,可以在温和的氧化还原中性条件下制备取代的吡咯烷、哌啶和氮杂环庚烷。