Synthesis of Quaternary-Carbon-Containing β<sup>2,2</sup>-Amino Acids by the Rh<sup>I</sup>-Catalyzed Enantioselective Arylation of α-Substituted β-Nitroacrylates
An enantioselective RhI‐catalyzed conjugate addition reaction of α‐substituted β‐nitroacrylates with various arylboronic acids by using chiral RhI diene catalysts is described for the first time. The addition reaction proceeds under mild conditions in a range of common organic solvents and additives, and it affords the corresponding quaternary‐carbon‐containing α,α‐disubstituted β‐nitropropionate products