Photopromoted Free Radical Silylation of 2-Aryl-2-indazoles with Silanes.

Photoinduced silylation of silanes with 2-aryl-2-indazoles was developed under mild conditions, which could efficiently result in diverse 3-silylated 2-indazoles with good substrate scopes. A series of scaled-up to gram level and radical capture operations were performed in this system. Meanwhile, a bioactive molecule was tolerated well under typical conditions.