CF3SO3H-enabled cascade ring-opening/dearomatization of indole derivatives to polycyclic heterocycles

Abstract

A novel dearomatization process to produce fused polycyclic indolines via a CF₃SO₃H-mediated cascade ring-opening of a β-lactam and hydroaminative cyclization is demonstrated. It provides a new strategy for the synthesis of important polycyclic indoline-2-amine derivatives in moderate to excellent yields, as well as with good functional group tolerance. Moreover, transformation of the product was performed to deliver the corresponding acid, alcohol and amide smoothly.