NaHCO3‐Catalyzed Hihgly Regiospecific Aminobromination of ß,ß‐Dicyanostyrene Derivatives with 1,3‐Dibromo‐5,5‐dimethylhydantoin (DBDMH)

The aminobromination of β,β-dicyanostyrene derivetives with 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) has been systematic studied. The reaction afforded the vicinal haloamino products in good to excellent yields at room temperature (the highest yield was up to 94 %), and the full regiospecificity of all products were achieved catalyzed by NaHCO3 in CH3CN. A possible pathway involving a Michael Addition reaction for this aminobromination was proposed.