Desulfonylcyanamidation of α,β-unsaturated sulfones with N -tosyl N -aryl cyanamides (NCTS): access to N -cyanoenaminones

-cyanoenaminesters, featuring broad substrate scope, high functional group tolerance, good to excellent yields, and transition-metal-free conditions. Additionally, a gram-scale experiment and Lu's [3 + 2] cycloaddition transformation demonstrate the synthetic utility of this protocol.