C-B axially chiral architectures are valuable in materials science and medicinal chemistry, but their enantioselective synthesis remains a challenge. Herein, we report an efficient method for the enantioselective synthesis of C-B axially chiral 1,2-azaborines through N-heterocyclic carbene-catalyzed dynamic kinetic resolution. Treatment of racemic 1,2-azaborine-based arylaldehyde with a chiral N-heterocyclic carbene catalyst under oxidative conditions in the presence of an alcohol leads to atroposelective esterification with up to 97% yield and 98% ee. The practicality of this method has been demonstrated by the late-stage functionalization, gram-scale synthesis, and further synthetic transformations. Mechanistic studies indicate that the chiral N-heterocyclic carbene catalyst differentiates between rapidly equilibrating atropoisomeric 1,2-azaborine-based arylaldehyde. DFT studies suggest that the formation of the Breslow intermediate via [Cs]HCO3-assisted [1,2]-proton transfer is the enantioselectivity-determining step.