Yield (engineering)

Stereocenter

Organic chemistry

Combinatorial chemistry

Stereochemistry

Enantioselective synthesis

Synergistic catalysis

Catalysis

Stereoselectivity

Chemistry

Metallurgy

Materials science

Pyrrolidine

Bimetallic strip

Amino acid

Biochemistry

Aldimine

Journal of the American Chemical Society

Cu/Ir dual catalysis has been developed for the stereodivergent α-allylation of aldimine esters. The method enables the preparation of a series of nonproteinogenic α-amino acids (α-AAs) bearing two contiguous stereogenic centers in high yield with excellent stereoselectivity. All four product stereoisomers could be obtained from the same set of starting materials via pairwise combination of two chiral catalysts. Notably, one-pot protocol could be successfully applied for the preparation of the bimetallic Cu/Ir complexes to simplify the manipulation of Cu/Ir dual catalysis. This method could be further utilized for the construction of the key intermediate of a bioactive pyrrolidine derivative and the concise synthesis of a plant growth regulator (2S,3S)-2-amino-3-cyclopropylbutanoic acid.

Stereodivergent Synthesis of α,α-Disubstituted α-Amino Acids via Synergistic Cu/Ir Catalysis