Iodine-Catalyzed Oxidative Functionalization of Azaarenes with Benzylic C(sp³)–H Bonds via N‑Alkylation/Amidation Cascade: Two‑Step Synthesis of Isoindolo[2,1‑<i>b</i>]isoquinolin-7(5<i>H</i>)‑one

An efficient and practical iodine-catalyzed oxidative functionalization of azaarenes with benzylic C–H bonds via an N-alkylation and amidation cascade is developed to provide isoquinolin-1­(2<i>H</i>)-ones. This method utilizes readily available unfunctionalized azaarenes and methylarenes as starting materials and proceeds under metal-free conditions with good to excellent yields, avoiding the use of expensive noble metal catalysts and generation of halide and metal wastes. The synthetic utility of this reaction is exemplified by the concise, two-step synthesis of isoindolo­[2,1-<i>b</i>]­isoquinolin-7­(5<i>H</i>)-one