Asymmetric Catalysis with Transition Metal Complexes

Asymmetric catalysis with transition metal complexes underpins the enantioselective synthesis of chiral molecules, a cornerstone of modern pharmaceutical, agrochemical and materials research. By tailoring the coordination environment around metals such as rhodium, iridium, palladium, nickel, zinc and cobalt, chemists control the three-dimensional arrangement of substrates in the key bond-forming events. Traditional strategies rely on chiral ligands—phosphines, N-heterocyclic carbenes, bis-oxazolines or diene scaffolds—to induce asymmetry, whereas emerging chiral-at-metal concepts dispense with ligand stereochemistry, instead harnessing a stereogenic metal centre. Recent advances have also illuminated the roles of attractive noncovalent interactions and detailed electronic structure in directing enantioselectivity. Together, these developments expand the toolkit for constructing enantiomerically pure compounds under mild, sustainable conditions, addressing global demands for safer, more efficient synthetic processes.

Research from Nature Portfolio

Recent studies have harnessed a palladium-catalysed Suzuki–Miyaura kinetic resolution to access optically pure stereogenic-at-iridium(III) complexes, achieving s-factors exceeding 100 and enabling subsequent elaboration into chiral metallodrugs and photosensitizers with high efficiency. Complementary work has demonstrated the asymmetric construction of a configurationally stable tetrahedral chiral-at-zinc complex via an unsymmetric tridentate ligand and chiral auxiliary strategy, which retains >99% ee even under thermal stress and functions as a highly selective catalyst for oxa-Diels–Alder reactions. Foundational mechanistic investigations of centrochiral octahedral nickel(II) catalysts have revealed how distortion-induced ‘naked’ d-orbitals, in concert with labile ligands, generate metal-enolate species and promote enantioselective [3+2] cycloadditions, thereby linking electronic structure to asymmetric induction.

Asymmetric Catalysis with Transition Metal Complexes publication trend

The graph below shows the total number of articles in asymmetric catalysis with transition metal complexes across all publications each year (not limited to Nature Index journals).

Technical terms

Chiral-at-metal catalyst: A metal complex whose overall chirality arises exclusively from a stereogenic metal centre coordinated by achiral ligands, obviating the need for chiral ligand elements.

Kinetic resolution: A process that separates enantiomers by selectively converting one enantiomer faster than the other under catalytic conditions, yielding both enriched product and unreacted substrate.

Enantioselectivity: The preferential formation of one enantiomer over its mirror image in a chemical reaction, typically expressed as enantiomeric excess (ee).

Stereogenic centre: An atom bearing substituents arranged such that interchanging any two of them leads to a stereoisomer, including metal centres with asymmetric coordination spheres.

Noncovalent interaction: Attractive forces such as hydrogen bonding, π–π stacking and electrostatic contacts that influence transition state geometry and thus control enantioselectivity.

References

1. Chiral-at-metal catalysts: history, terminology, design, synthesis, and applications. Chemical Society Reviews (2025).
2. Recent Developments in Enantioselective Transition Metal Catalysis Featuring Attractive Noncovalent Interactions between Ligand and Substrate. ACS Catalysis (2020).
3. Asymmetric synthesis of stereogenic-at-iridium(III) complexes through Pd-catalyzed kinetic resolution. Nature Communications (2025).
4. Asymmetric construction of tetrahedral chiral zinc with high configurational stability and catalytic activity. Nature Communications (2020).
5. Naked d-orbital in a centrochiral Ni(II) complex as a catalyst for asymmetric [3+2] cycloaddition. Nature Communications (2017).