N-Heterocyclic carbene-catalyzed 3+3 cyclocondensation of bromoenals with aldimines: highly enantioselective synthesis of dihydropyridinones

The N-heterocyclic carbene-catalyzed 3+3 cyclocondensation of bromoenals and aldimines was developed to give the corresponding dihydropyridinones in good yields with excellent enantioselectivities.