An efficient route for the stereoselective conversion of ketones into three-carbons homologated primary E-allylamines: The palladium-catalysed reaction of vinyl triflates with N,N-di-tert-butoxycarbonyl-N-allylamine.
E-Allylamines N-protected with the easily removable tert-butoxycarbonyl group are stereoselectively prepared in good to high yield through the palladium-catalysed reaction of vinyl triflates with N,N-di-tert-butoxycarbonyl-N-allylamine in the presence of AcOK and n-Bu4NCl. The reaction is very sensitive to the nature of the base. The use of bases other than AcOK has been examined and proved to be unsuccessful
palladium-catalyzed cross-coupling of o-allylic and o-vinylic phenols with vinylic halides and triflates produces substituted dihydrobenzopyrans and dihydrobenzofurans respectively in good to high yields. The proposed mechanism involves vinylpalladium addition to the olefin, rearrangement to a π-allylpalladium intermediate and subsequent intramolecular nucleophilic displacement of palladium.