Copper‐Catalyzed Enantioselective 1,6‐Boration of <i>para</i>‐Quinone Methides and Efficient Transformation of <i>gem</i>‐Diarylmethine Boronates to Triarylmethanes

Abstract

Abstract Presented is the first enantioselective copper‐catalyzed 1,6‐conjugate addition of bis(pinacolato)diboron to para ‐quinone methides. The reaction proceeds with excellent yields and good to excellent enantioselectivities, and provides an attractive approach to the construction of optically active gem‐diarylmehtine boronic esters. Additionally, the subsequent conversion of the derived potassium trifluoroborates into triarylmethanes with highly enantiospecificity was realized.