Nickel-catalyzed reductive coupling of α-haloboronates to access internal vicinal bis(boronate) esters

1,2-Bis(boronate) esters have emerged as valuable synthetic building blocks due to the versatile reactivity of their two C-B bonds. Herein, we report a nickel-catalyzed reductive coupling reaction of α-haloboronates for constructing symmetric and unsymmetric targets with a broad substrate scope and excellent functional group tolerance.