N-Cbz sulfilimines as valuable intramolecular nucleophiles for the stereoselective synthesis of (−)-deoxocassine and (+)-desoxoprosophylline

N-Cbz sulfilimine, prepared from the corresponding sulfoxide using the Burgess reagent, has been employed as an intramolecular nucleophile for the regio- and stereoselective preparation of a bromo-carbamate from an alkene. The bromo-carbamate has been utilized as an advanced common synthon for the synthesis of deoxocassine and desoxoprosophylline employing the ene and amidomercuration as key reactions.