Nazarov Reagent: New Role for the [4+2] Domino Benzannulation Reaction to Construct Polysubstituted Benzenes

A new role for the Nazarov reagent was revealed in the 4+2] benzannulation reaction, and delivered a series of polyfunctional benzenes in high yields under mild conditions. This metal‐free process not only expanded the application of the Nazarov reagent in organic synthesis, but also provided a new, efficient way to construct polyfunctional benzenes.