AbstractA sequential process via photoredox catalysis and Lewis acid mediation for C−F bond transformation of the CF2 unit in perfluoroalkyl groups has been achieved to transform perfluoroalkylarenes into complex fluoroalkylated compounds. A phenothiazine‐based photocatalyst promotes the defluoroaminoxylation of perfluoroalkylarenes with (2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl (TEMPO) under visible light irradiation, affording the corresponding aminoxylated products. These products undergo a further defluorinative transformation with various organosilicon reagents mediated by AlCl3 to provide highly functionalized perfluoroalkyl alcohols. Our novel phenothiazine catalyst works efficiently in the defluoroaminoxylation. Transient absorption spectroscopy revealed that the catalyst regeneration step is crucial for the photocatalytic aminoxylation.
摘要 通过光氧化催化和路易斯酸介导,实现了全氟烷基中 CF2 单元 C-F 键转化的连续过程,从而将全氟烷基烯烃转化为复杂的氟烷基化合物。在可见光照射下,一种基于吩噻嗪的光催化剂促进了全氟烷基烯与 (2,2,6,6- 四甲基哌啶-1-基) 氧基 (TEMPO) 的脱氟胺氧化反应,从而得到相应的胺氧化产物。这些产物在 AlCl3 的介导下与各种有机硅试剂发生进一步的脱氟转化,生成高官能度的全氟烷基醇。我们的新型吩噻嗪催化剂可在脱氟胺氧基化反应中有效发挥作用。瞬态吸收光谱显示,催化剂再生步骤对于光催化氨基化反应至关重要。