Synthetic Approaches to Access Indolin‐3‐ones

Indolin‐3‐one constitutes an important core in naturally occurring bio‐active alkaloids, dyes, and synthetic compounds. Though endowed with an interesting biological profile, this core received comparatively less attention than its well‐explored isomer indolin‐2‐one. Herein, we review the synthetic strategies for constructing this oxygenated indole motif during the past decade (2014‐2024). The metal‐mediated and metal‐free methods have been covered, with a discussion of the key reactions and the mechanistic scenario prevailing in the strategies. This one‐stop platform will undoubtedly enrich the researchers and help expand the research domain in this area.