Copper-catalyzed highly selective approach to 2-boroallylic silanes from allenylsilanes
A highly chemo- and regioselective copper-catalyzed borylcupration of 1,2-allenylsilanes affords 2-borylallylsilanes by applying the ligand effect. Many synthetically attractive functional groups are well tolerated. As demonstrated, such 2-borylallylsilanes are very useful dimetallic reagents in organic synthesis. A rationale for the regioselectivity switch is provided.