“…Based on its potential bioactivities, the synthesis of the indolin‐3‐ones with indoxyl functional group has been paid more attention. Many synthetic methods have been reported, such as trapping metallocarbene by organoazide, gold/copper co‐catalyzed oxidation of 2‐alkynylanilines, TEMPO/Pd‐catalyzed oxidation of indoles, DDQ‐promoted oxidative aza ‐Friedel‐Crafts alkylation of indole with 3‐indolelinone‐2‐carboxylates, InCl 3 ‐mediated addition of indol‐3‐one‐ N ‐oxide, Pd‐catalyzed oxidative dearomatization of 2‐arylindoles, visible light photocatalytic oxygenation of indoles and Mannich reaction of cyclic‐acylimines –. Although these reported reactions are efficient methods, the novel strategy for the preparation of indolin‐3‐ones bearing indoxyl group is still needed.…”