N-Heterocyclic carbene-catalyzed 3 + 3 annulation of bromoenals with 2-aminochromones to access chromeno2,3-bpyridinones

N-Heterocyclic carbene-catalyzed 3 + 3 annulation of bromoenals with 2-aminochromones has been successfully developed. A structurally diverse set of chromeno2,3-bpyridinones was efficiently constructed in acceptable to excellent yields. The reaction features mild reaction conditions, a broad substrate scope, and easy scale-up.