Fig. 3: Substrate scope of the lactam-fused indolines from various secondary α-silylamines.

Reaction conditions: solution of 1d (0.3 mmol), 4 (0.36 mmol), and 4CzIPN (1.3 mol%) in DMF (1.0 mL) was irradiated by 1 W blue LEDs for 2 h in argon. Then the reaction vial was warmed at 60 °C for additional 3 h without blue LEDs. Isolated yields are shown. d.r. values were based on 1H NMR analysis.