Visible Light Photoredox Catalysis: Synthesis of Indazolo[2,3‑a]quinolines from 2‑(2-Nitrophenyl)-1,2,3,4-tetrahydroquinolines

The synthesis of indazolo[2,3-a]quinoline derivatives
in moderate to good yields from 2-(2-nitrophenyl)-1,2,3,4-tetrahydroquinolines
via visible light photoredox catalysis is reported. The reaction involves
a novel ruthenium-catalyzed intramolecular formation of the N–N
bond of the indazole ring.

报道了一种通过可见光光氧化催化从2-(2-硝基苯基)-1,2,3,4-四氢喹啉中合成吲哚并[2,3-a]喹啉衍生物的方法，该合成在中等至良好的产率下进行。该反应涉及新型钌催化的分子内形成吲唑环的N-N键。