Electrochemical Intramolecular Aminobromination of Alkenes

A versatile electrochemical method for the intramolecular aminobromination of alkenes has been developed. The method provides access to five-, six-, and seven-membered heterocycles by exploiting tetrabutylammonium bromide as an electrolyte and bromine source. The mild electrochemical generation of Br2 plausibly allows the formation of a cyclic bromonium intermediate, as supported by density functional theory calculations.