我们在此公开了一种直接的光化学方法,用于构建含有合成有用的琥珀酸单元的菲啶。该反应在可见光照射下发生,廉价的曙红 Y Na 作为光氧化还原催化剂,重氮化合物作为琥珀酸盐前体。在最佳反应条件下,以中等至良好的收率获得了范围广泛的菲啶。请注意,最终杂环中的琥珀酸单元可以很容易地转化为许多有价值的结构,例如 γ-丁内酯、二氢呋喃-2(3 H )-酮和四氢呋喃。进行了机械实验以支持所提出的机制。
A new protocol for the palladium‐catalyzed free‐amine‐directed alkenylation of C(sp2)H bonds and cycloamination is described. Substituted biaryl‐2‐amines react with various alkenes, including electron‐deficient alkenes, aryl alkenes and alkyl alkenes, to give the corresponding phenanthridines with exclusive regioselectivity. The use of α‐branched styrenes leads to the formation of tricyclic compounds
Unlocking the reactivity of diazo compounds in red light with the use of photochemical tools
作者:Katarzyna Orłowska、Klaudia Łuczak、Piotr Krajewski、João V. Santiago、Katarzyna Rybicka-Jasińska、Dorota Gryko
DOI:10.1039/d3cc05174a
日期:——
The red light-irradiation of structurally diversified diazoalkanes gives access to reactive intermediates via direct photolysis and via photosensitization or photoredox approaches.