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New alkenylboronic esters were synthesised from halo‐substituted alkenylboronic esters through cross‐coupling reactions. Upon Johnson rearrangement, enantiomerically pure allylboronates bearing a stereogenic centre in the position α to the boron moiety were obtained in moderate yield (53 %; 29 % over six steps from the protected propargylic alcohols). The products of these reactions were separable...
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