Stereoselective aminosulfonylation of alkynes: an approach to access (Z)-beta-amino vinylsulfones

The stereoselective sulfur-nitrogen difunctionalization (aminosulfonylation) across the alkyne framework in asynmode is accomplished using sodium sulfinates and azoles, in the presence of I-2/base. This strategy is applicable to a variety of terminal alkynes, sodium sulfinates, and azoles as reaction partners, affording (Z)-beta-amino vinylsulfones in good yields.