Unexpected multiple electrophilic addition reaction of (Z)-alk-2-en-4-ynoates with N,N-dibromo-p-toluenesulfonamide (TsNBr(2)): a highly diastereoselective synthesis of densely functionalized aziridines.

A novel electrophilic addition reaction of (Z)-alk-2-en-4-ynoates and TsNBr(2) is reported, providing a facile and highly stereoselective synthesis of densely functionalized aziridine derivatives.