Metal‐Free [3+2] Tandem Cyclization Synthesis of Unique 11<i>H</i>‐Pyrido[3′,2′:4,5]Pyrrolo[3,2‐<i>b</i>]Indolizine from 7‐Azaindoles and Pyridotriazoles

Abstract

The metal‐free, green and highly atom‐economic formal [3+2] tandem cyclization is ideal for sustainable reaction development. It can be employed to synthesize unique 11 H ‐pyrido[3′,2′:4,5]pyrrolo[3,2‐ b ]indolizines from 7‐azaindoles and pyridotriazoles through a TsOH‐induced efficient process.