Iron-catalyzed bromination of aryl azides by N-bromosuccinimide: Efficient method for the synthesis of brominated aryl azides

An efficient and mild protocol for bromination of aryl azides with N-bromosuccinimide (NBS) under FeCl3 catalysis in 1,2-dichloroethane was developed. It is proved to be an efficient method for obtaining brominated aryl azides.