SO2F2 mediated transformation of pyrazolones into pyrazolyl fluorosulfates.

The construction of a class of novel N-heterocyclic molecules containing both pyrazole and fluorosulfate functionalities was achieved through the reactions of pyrazolones with SO2F2 in good to excellent yields. The fluorosulfate moieties were utilized as versatile building blocks in the Suzuki coupling reaction and SuFEx click chemistry.