Palladium-Catalyzed Enantioselective C–H Functionalization

Palladium-catalyzed enantioselective C–H functionalization has emerged as a powerful strategy to convert ubiquitous C–H bonds directly into stereodefined carbon–carbon and carbon–heteroatom bonds. By combining palladium’s unique ability to activate inert C–H bonds with carefully designed chiral ligands and substrate‐bound directing groups, chemists can achieve high levels of enantioselectivity in the construction of complex molecular architectures. Central to this field are ligand frameworks such as mono-N-protected amino acids, phosphoramidites or bidentate N-heterocyclic carbene derivatives, which guide palladium to specific C–H sites and induce asymmetric metalation through concerted metalation–deprotonation or oxidative addition pathways. These methods have been applied to the synthesis of chiral cyclopropanes, isoquinolines, amino acid derivatives and polycyclic scaffolds of pharmaceutical and agrochemical relevance. Mechanistic investigations, including kinetic isotope effects and computational studies, reveal the importance of agostic interactions and transition-state stabilisation in governing regio- and enantioselectivity. By streamlining access to enantioenriched frameworks without prefunctionalisation, palladium-catalysed enantioselective C–H functionalization continues to expand the toolbox for sustainable asymmetric synthesis on both academic and industrial scales.

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Palladium-Catalyzed Enantioselective C–H Functionalization publication trend

The graph below shows the total number of articles in palladium-catalyzed enantioselective c–h functionalization across all publications each year (not limited to Nature Index journals).

Technical terms

C–H activation: The cleavage and functionalisation of a carbon–hydrogen bond by a transition-metal catalyst.

Enantioselectivity: The preferential formation of one enantiomer over its mirror image in an asymmetric reaction.

Mono-N-protected amino acid (MPAA): A class of bidentate ligands combining an amino acid backbone and a protected nitrogen donor used to direct palladium.

Directing group: A functional moiety on a substrate that coordinates to the metal catalyst and guides site-selective C–H cleavage.

Agostic interaction: A stabilising bonding interaction between a C–H bond and a metal centre in a transition-state or complex.

References

1. A palladium catalyzed asymmetric desymmetrization approach to enantioenriched 1,3-disubstituted isoindolines. Chemical Science (2023).
2. Pd(II)-Catalyzed Enantioselective C(sp3)–H Arylation of Cyclopropanes and Cyclobutanes Guided by Tertiary Alkylamines. Journal of the American Chemical Society (2022).
3. Access to chiral dihydrophenanthridines via a palladium(0)-catalyzed Suzuki coupling and C–H arylation cascade reaction using new chiral-bridged biphenyl bifunctional ligands. Chemical Science (2024).