1,1-Disubstituted and trisubstituted alkenes were converted into the corresponding beta,gamma-unsaturated amines 4 via three steps: the initial formation of alpha,beta-unsaturated diphenylsulfonium triflates 2 from alkenes and diphenyl(trifluoromethanesulfonyloxy)sulfonium trifluoromethanesulfonate (1), followed by double bond migration of 2 to beta,gamma-unsaturated sulfonium triflates 3 with primary or secondary amines, and successive nucleophilic substitution of 3 with these amines.