Highly diastereoselective aminobromination of β-methyl-β-nitrostyrenes with t-butyl N,N-dibromocarbamate/t-butyl carbamate as bromine/nitrogen sources

A facile and stereoselective aminobromination reaction of α,β-unsaturated nitro compounds with t-butyl N,N-dibromocarbamate/t-butyl carbamate as bromine/nitrogen sources was reported. This catalytic system could tolerate a wide scope of β-methyl-β-nitrostyrenes, resulting in good chemical yields and excellent regio- and stereoselectivities. Furthermore, the N-t-butoxycarbonyl protecting group could be easily cleaved to afford the free vicinal haloamines.