KI-catalyzed aminobromination of olefins with TsNH(2)-NBS combination.

An efficient KI-catalyzed aminobromination of olefins has been developed with good to excellent yields and high regio- and stereoselectivities under transition metal-free conditions. A series of olefins, including alpha,beta-unsaturated carbonyl compounds and simple olefins, was studied. The reaction was performed in CH(2)Cl(2) using KI as the catalyst and TsNH(2) and NBS as the nitrogen and bromine sources.