Tartrate-derived (2R,3R)-1,4-dimethoxy-1,1,4,4-tetraphenylbutane-2,3-diol has found diverse applications in asymmetric organic synthesis. Among these, its utilization as a protecting group for boronic acids has been investigated extensively. Besides being extraordinarily stable and thus allowing a plethora of transformations, it enables access to various diastereo- and enantiomerically pure organoboron reagents and versatile intermediates in asymmetric synthesis.

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

Bromoboration and subsequent reaction with optically active diol (II) provides 2‐bromo substituted alkenylboronic esters (III).