Sulfamoyl fluorides can be made by treating secondary amines with sulfuryl fluoride (SOF) or sulfuryl chloride fluoride (SOClF). Cyclic secondary amines work as well, provided they are not aromatic.
Sulfamoyl fluorides can also be made from sulfamoyl chlorides, by reacting with a substance that can supply the fluoride ion, such as NaF, KF, HF, or SbF.
Sulfonamides can undergo a Hofmann rearrangement when treated with a difluoro-λ-bromane to yield a singly substituted N-sulfamoyl fluoride.