An unexpected highly stereoselective double aza-Baylis-Hillman reaction of sulfonated imines with phenyl vinyl ketone

The aza-Baylis-Hillman reaction of N-sulfonated imine with phenyl vinyl ketone gave the double aza-Baylis-Hillman adduct in good yields with excellent stereoselectivities in the presence of Lewis base 1,4-diazabicyclo[2.2.2] octane.