Dibromination of 5‐pyrazolones and 5‐hydroxypyrazoles via dibromoisocyanuric acid

Abstract magnified image A safe and efficient method was developed for the dibromination of pyrazolones and 5‐hydroxypyrazoles by use of dibromoisocyanuric acid (DBI). The reaction gave the corresponding dibrominated pyrazolones in excellent yields (≥91%). J. Heterocyclic Chem., (2010).