One-pot simultaneous debrominative decarboxylation and sulfamation of anti-2,3-dibromo-3-(4- chlorosulfonylphenyl)propanoic acid in DMF (for alkylamines) or DMF-pyridine (1/1, for arylamines) using a diverse range of alkyl and aryl amines under microwave irradiation stereoselectively afforded intermediate (Z)-4-(2-bromovinyl)benzenesulfonamides. The intermediates, without isolation and purification, were treated with EtONa to give the desired 4-ethynylbenzenesulfonamides.