Visible-Light-Induced C–O Bond Formation for the Construction of Five- and Six-Membered Cyclic Ethers and Lactones
作者:Honggu Im、Dahye Kang、Soyeon Choi、Sanghoon Shin、Sungwoo Hong
DOI:10.1021/acs.orglett.8b03166
日期:2018.12.7
Visible-light-induced intramolecular C–O bond formation was developed using 2,4,6-triphenylpyrylium tetrafluoroborate (TPT), which allows the regiocontrolled construction of cyclic ethers and lactones. The reaction is likely to proceed through the single-electron oxidation of the phenyl group, followed by the formation of a benzylic radical, thus preventing a competing 1,5-hydrogen abstraction pathway
可见光诱导的分子内C-O键的形成是使用2,4,6-三苯基吡啶鎓四氟硼酸酯(TPT)进行的,该化合物可进行区域控制的环醚和内酯的构建。该反应可能通过苯基的单电子氧化进行,然后形成苄基,从而阻止竞争的1,5-氢提取途径。详细的机理研究表明,分子氧可用于捕获自由基中间体以形成苯甲醇,然后将其进行环化。通过使用统一协议提供对有价值的五元和六元环醚和内酯的有效访问,此新方法可作为强大的平台。