Kinetic Resolution Strategies in Organic Synthesis

Kinetic resolution exploits differences in reaction rates between enantiomers to achieve enantiomeric enrichment from racemic mixtures. A chiral catalyst or reagent selectively transforms one enantiomer faster than its mirror image, with the maximum theoretical yield limited to 50 percent. Advances in catalyst design—from enzymatic acylations to transition-metal-catalysed silylations, hydrogenations and organocatalytic approaches—have steadily improved selectivity, operational simplicity and substrate scope. Key performance metrics include the selectivity factor, which quantifies the rate ratio of fast‐ versus slow‐reacting enantiomers, and enantiomeric excess, which expresses optical purity. Complementary methods such as dynamic kinetic resolution, involving in situ racemisation, overcome yield limitations, while desymmetrization and auxiliary-guided strategies expand access to complex architectures. Applications span the synthesis of chiral alcohols, amines, diols and biaryls, underpinning progress in pharmaceuticals, agrochemicals and material sciences through more sustainable and efficient enantioselective processes.

Research from Nature Portfolio

Recent studies have built on broad-spectrum catalytic systems for alcohols, new oxygenation processes for amines and auxiliary-guided resolutions. A landmark copper hydride system has enabled the dehydrogenative coupling of diverse alcohols with hydrosilanes, achieving exceptional selectivity factors for benzylic and allylic substrates under mild conditions. In another development, a titanium-catalysed asymmetric oxygenation has been applied to indoline substrates, converting one enantiomer to hydroxylamines with high chemoselectivity and enantio-discrimination, employing hydrogen peroxide as an eco-friendly oxidant. More recently, the kinetic resolution of auxiliary adjacent alcohols (KRA*) has emerged to access challenging tetrasubstituted stereocentres; this strategy uses a transient neighbouring alcohol as a resolving handle to deliver a broad array of optically active tertiary alcohols, epoxides and related derivatives that would otherwise be inaccessible by direct asymmetric catalysis.

Kinetic Resolution Strategies in Organic Synthesis publication trend

The graph below shows the total number of articles in kinetic resolution strategies in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Kinetic resolution: A process that exploits the difference in reaction rates of enantiomers to achieve enantiomeric enrichment.

Selectivity factor: A numerical measure of the rate ratio between fast-reacting and slow-reacting enantiomers in a kinetic resolution.

Enantiomeric excess (ee): The difference in proportion between two enantiomers in a chiral mixture, expressed as a percentage.

Desymmetrization: A transformation converting a symmetrical substrate into an enantiomerically enriched product by selective reaction at one of equivalent sites.

Atroposelective: Pertaining to the selective formation or reaction of chiral axes in biaryl and related systems.

References

1. Kinetic Resolution of BINOLs and Biphenols by Atroposelective, Cu–H-Catalyzed Si–O Coupling with Hydrosilanes. Organic Letters (2024).
2. Broad-spectrum kinetic resolution of alcohols enabled by Cu–H-catalysed dehydrogenative coupling with hydrosilanes. Nature Communications (2017).
3. Kinetic resolution of indolines by asymmetric hydroxylamine formation. Nature Communications (2021).
4. Access to enantioenriched compounds bearing challenging tetrasubstituted stereocenters via kinetic resolution of auxiliary adjacent alcohols. Nature Communications (2021).
5. Atroposelective Silylation of 1,1′‐Biaryl‐2,6‐diols by a Chiral Counteranion Directed Desymmetrization Enhanced by a Subsequent Kinetic Resolution. Angewandte Chemie International Edition (2023).