Saucy-Marbet rearrangements of alkynyl halides in the synthesis of highly enantiomerically enriched allenyl halides

A stereospecific Saucy-Marbet rearrangement of alkynyl halides is described here. These rearrangements provide an entry to highly enantiomerically enriched allenyl bromides and chlorides through excellent chirality transfer and the preservation of optical integrity of alkynyl halides. (C) 2008 Elsevier Ltd. All rights reserved.