A new convenient stereoselective synthesis of β-brominated β′-(functional alkyl) α, β- unsaturated esters has been developed by the reaction of tetraalkylammonium fluoride in HMPA with ethyl 2, 3-dibromo 2-(functional alkyl) propionates which can be easily prepared by addition of bromine to β′-(functional alkyl) acrylates. An interpretation of the observed stereoselectivity is proposed.
