Regioselective α-Allylation of Cyclic Allylborates with Allylic Bromides

Allylic boron compounds are valuable nucleophiles for introducing allylic moieties into organic compounds. While numerous examples of γ-selective functionalization, such as the allylboration of carbonyl compounds, have been reported, α-selective carbon–carbon bond formation involving allylborates remains limited. In this study, α-selective allylation of cyclic allylborates was achieved using allylic bromides as carbon-based electrophiles. The reaction between cyclic allylborates and allylic bromides produced various allylboronates in moderate to good yields.