Environmentally Benign Synthesis of Indeno[1,2‑<i>b</i>]quinolines via an Intramolecular Povarov Reaction

Abstract

A new synthetic route to indeno[1,2-<i>b</i>]quinolines via reactions of <i>o</i>-propargylbenzaldehydes with <i>N</i>-aryl amines based on an intramolecular aza-Diels–Alder (Povarov) reaction has been developed. This method offers several advantages such as no requirement for an oxidant, high efficiency, and a wide reaction scope