Synthesis of Cyclopropyl Pinacol Boronic Esters from Dibromo-cyclopropanes

The synthesis of cyclopropyl pinacol boronic esters from di-bromocyclopropanes via Matteson-Pasto rearrangement is reported. The method is readily scalable and shows limited levels of stereoinduction, with a selectivity that is in part complementary to that observed in existing stereoselective borylcyclopropanation strategies. The method can be used to rapidly access borylcyclopropanes as interesting building blocks for diversely functionalized cyclopropanes.