Asymmetric Synthesis of Amino Acid Analogues

The asymmetric synthesis of amino acid analogues encompasses a suite of strategies designed to create non‐natural building blocks with high enantiomeric purity. These analogues serve as indispensable components in drug discovery, peptide design and agrochemical development. Central approaches include the use of chiral auxiliaries and ligand‐controlled metal catalysis, particularly Ni(II) complexes of Schiff bases derived from glycine, which enable controlled alkylation to furnish diverse α-amino acids. Organocatalytic methods, dynamic kinetic resolution and transition-metal-catalysed cross-couplings further expand the repertoire of accessible scaffolds, permitting the introduction of functional groups such as fluorine atoms or phosphonic acid motifs for enhanced metabolic stability and bioactivity. Recent advances address scalability and cost-efficiency, with recyclable ligands and auxiliaries improving the commercial viability of large-scale preparations. Analytical challenges linked to enantiomeric excess measurements, including self-disproportionation phenomena, are now recognised and mitigated by standardised testing protocols. Collectively, these developments underscore the global importance of stereo-controlled amino acid analogue synthesis for next-generation therapeutics and fine chemicals.

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Asymmetric Synthesis of Amino Acid Analogues publication trend

The graph below shows the total number of articles in asymmetric synthesis of amino acid analogues across all publications each year (not limited to Nature Index journals).

Technical terms

Enantiomer: One of two non-superimposable mirror-image forms of a chiral molecule.

Enantiomeric excess (ee): A quantitative measure of the predominance of one enantiomer over the other in a chiral mixture.

Chiral auxiliary: A temporary stereochemical director covalently attached to a substrate to induce enantioselectivity in subsequent transformations.

Schiff base: An imine formed by condensation of an amine with a carbonyl compound, often employed to complex metal ions in asymmetric catalysis.

Self-disproportionation of enantiomers (SDE): The spontaneous separation of a scalemic mixture into enriched and depleted fractions during achiral physical or chromatographic processes.

References

1. The self-disproportionation of enantiomers (SDE): a menace or an opportunity?. Chemical Science (2018).
2. Asymmetric Synthesis of Tailor-Made Amino Acids Using Chiral Ni(II) Complexes of Schiff Bases. An Update of the Recent Literature. Molecules (2020).
3. Negishi cross-couplings in the synthesis of amino acids. Organic & Biomolecular Chemistry (2017).
4. The Latest FDA-Approved Pharmaceuticals Containing Fragments of Tailor-Made Amino Acids and Fluorine. Pharmaceuticals (2022).
5. Recommended Tests for the Self-Disproportionation of Enantiomers (SDE) to Ensure Accurate Reporting of the Stereochemical Outcome of Enantioselective Reactions. Molecules (2021).