Asymmetric Fluorination Methodologies in Medicinal Chemistry

The strategic incorporation of fluorine atoms into drug candidates has become a cornerstone of modern medicinal chemistry, owing to the unique influence of the C–F bond on molecular polarity, metabolic stability and binding affinity. Asymmetric fluorination methodologies enable the stereocontrolled installation of fluorine at stereogenic centres, delivering enantiomerically enriched organofluorine compounds with significant therapeutic potential. Electrophilic fluorinating reagents, nucleophilic fluoride sources and radical‐based processes each present distinct mechanistic pathways for C–F bond formation. Transition-metal catalysts and small-molecule organocatalysts have been engineered to guide fluorination at prochiral centres, often exploiting hydrogen-bonding or ion-pair interactions to achieve high levels of enantioselectivity. These advances have broadened the accessible chemical space for fluorinated drug leads, facilitating the rapid synthesis of chiral building blocks for further elaboration into protease inhibitors, receptor agonists and other bioactive scaffolds. Moreover, downstream transformations of the C–F bond, such as stereospecific cleavage or cross-coupling, provide versatile handles for diversification and late-stage modification. The combination of methodological innovation and practical scalability underscores the global significance of asymmetric fluorination in accelerating the discovery of next-generation therapeutics.

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Asymmetric Fluorination Methodologies in Medicinal Chemistry publication trend

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Technical terms

Electrophilic fluorinating reagent: A fluorine donor species that delivers an electrophilic fluorine atom to nucleophilic carbon centres, often N–F or F–F based.

Organocatalysis: Catalysis of organic transformations using small, non-metal organic molecules that activate substrates through noncovalent interactions or transient covalent bonds.

Quaternary stereogenic centre: A carbon atom bonded to four distinct substituents, one of which is fluorine in the context of asymmetric fluorination.

Enantioselectivity: The preference of a catalytic process to form one enantiomer over its mirror image, typically expressed as enantiomeric excess.

References

1. Reagent-controlled enantioselectivity switch for the asymmetric fluorination of β-ketocarbonyls by chiral primary amine catalysis. Chemical Science (2017).
2. Asymmetric Preparation of α-Quaternary Fluorinated β-keto Esters. Review. Molecules (2020).
3. Enantioselective fluorination of α-branched aldehydes and subsequent conversion to α-hydroxyacetals via stereospecific C–F bond cleavage. Chemical Science (2016).