Sequential [3 + 2] Annulation/Intramolecular Transesterification of <i>o</i> -Hydroxyaryl Azomethines and Conjugated Dienes: Access to Chromeno[4,3- <i>b</i> ]pyrrolidines

Herein, we report a domino cyclization reaction of o -hydroxyaryl azomethines with electron-deficient conjugated dienes. This method provides a novel and efficient pathway for the construction of chromeno[4,3- b ]pyrrolidine derivatives. The protocol exhibits excellent chemoselectivity and a broad substrate scope. Furthermore, the reaction can be scaled up to gram quantities under the standard conditions.