The nickel-catalyzed reaction of carbonyls and dienes was accomplished in a regio- and stereoselective fashion employing a stoichiometric amount of bis(pinacolato)diboron. In the presence of P(SiMe(3))(3), this reductive coupling furnishes allyl boronic esters which are regioisomeric to those obtained with PCy(3) as the ligand. The coupling product may be subject to oxidation, which furnishes the derived 1,3-diol, or allylation with an additional aldehyde, which furnishes the derived 1,6-diol in a stereoselective fashion.
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Cho et al. (2010) studied this question.
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