Synthesis and Reactivity of the 3‐Substituted Isoindolinone Framework to Assemble Highly Functionalized Related Structures

An efficient potassium carbonate‐catalyzed synthesis of 3‐substituted isoindolinones through tandem aldol/cyclization reactions of active methylene compounds with 2‐cyanobenzaldehyde is described. The utility of the obtained isoindolinones has been demonstrated through an exploration of the chemical space by employing a series of interesting methodologies that led to diverse, highly functionalized compounds. Among them, a surprisingly straightforward potassiumcarbonate‐catalyzed double tandem reaction led to tricyclic hemiaminal derivatives.