α‐Diazo‐β‐oxosulfones have been shown to undergo a TiCl4‐promoted Wolff cyclocondensation with anilines to give moderate yields of medicinally relevant sulfonyl 1,2,3‐triazoles. If TiCl4 is omitted, a thermal Wolffrearrangement occurs, leading to α‐sulfonyl acetanilides formed via trapping of the respective ketene intermediate.