Fig. 3: Substrate scope study for synthesis of iminoisocoumarins 3.

^[a]Reaction conditions: 1 (0.5 mmol), PhIO (1.5 equiv), 2,4,6-tris-isopropylbenzene sulfonic acid (S4; 1.5 equiv) and LiClO₄ (1.5 equiv) in DCE (5.0 mL) at 80 °C for 0.1–0.5 h. Isolated yield.