Asymmetric Synthesis of Spiro[Azetidine‐3,3′‐Indoline]‐2,2′‐Diones via Copper(I)‐Catalyzed Kinugasa/C−C Coupling Cascade Reaction

Abstract

AbstractSpiro[azetidine‐indolines] are important scaffolds in diverse bioactive compounds. Current efforts to synthesize spiro[azetidine‐indolines] are limited to chiral spiro[azetidine‐2,3′‐indolines]. Asymmetric synthesis of structurally similar chiral spiro[azetidine‐3,3′‐indolines] remains unexplored. In this work, the first copper(I)‐catalyzed asymmetric Kinugasa/aryl C−C coupling cascade reaction is described. This provides a straightforward access to densely functionalized chiral spiro[azetidine‐3,3′‐indoline]‐2,2′‐diones in good yields and with high enantioselectivity.