Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Epoxides generated from cyclic ene carbamates are effective N-acyl iminium ion precursors and allow for the preparation of β-hydroxy, α-substituted piperidines and pyrrolidines. The total synthesis of racemic Febrifugine is also described. ... Epoxides generated from cyclic ene ...