Transition Metal‐Free, Visible Light‐Mediated Radical Cyclisation of Malonyl Radicals onto 5‐Ring Heteroaromatics
作者:Pol Hernández‐Lladó、Kilian Garrec、Daniel C. Schmitt、Jonathan W. Burton
DOI:10.1002/adsc.202101451
日期:2022.5.17
Annulated heteroaromatics can be accessed through the addition of malonyl radicals onto heterocycles. Current methods are applicable to electron-rich heteroaromatics and reliant on transition metals or toxic tin reagents. Here we report a metal-free, visible light-mediated cyclisation of malonates onto 5-ring heteroaromatics using iodomalonates as key intermediates. The iodomalonates are prepared and
可以通过将丙二酰基自由基添加到杂环上来获得环状杂芳烃。目前的方法适用于富电子杂芳烃并依赖于过渡金属或有毒锡试剂。在这里,我们报告了使用碘丙二酸酯作为关键中间体的无金属、可见光介导的丙二酸酯环化到 5 环杂芳烃上。碘代丙二酸酯原位制备和光解得到所需的环状产物,产率为 46-94%,无需外部催化剂。这种转化的范围包括N-烷基、N-酰基和碳束缚丙二酸酯,添加到广泛的 5 元杂芳烃上。