Synthesis of Pyridazinoindoles by Annulation of 2‐Alkenylindoles and Hydrazonyl Chlorides

A novel [3+3] annulation reaction of 2‐alkenylindoles with hydrazonyl chlorides in the presence of base for the formation of pyridazino[4,5‐b]indoles was developed. This approach provided a convenient and efficient way to synthesize a series of functionalized pyridazino[4,5‐b]indoles derivatives. The method exhibited a broad substrate scope and provided the corresponding pyridazino[4,5‐b]indoles products with excellent yields.