Fig. 5: Preparation of other relevant trans-2,3-disubstituted indolines.

Reaction conditions: solution of 8 (0.3 mmol), 2a (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.