Fluorinated Compounds in Medicinal Chemistry

Fluorinated compounds have become indispensable tools in drug discovery, offering unique opportunities to modulate pharmacokinetic properties, target binding and molecular conformation. The strong carbon–fluorine bond imparts metabolic stability and resistance to oxidative degradation, while fluorine’s small size and high electronegativity allow for subtle electronic adjustments without dramatically increasing steric bulk. Incorporation of fluorine atoms or fluoroalkyl groups can enhance lipophilicity or, when applied judiciously, reduce it to optimise absorption and distribution profiles. Moreover, the concept of bioisosterism between hydrogen and fluorine has enabled the design of novel scaffolds that preserve three-dimensional shape and hydrogen-bonding networks, broadening the scope of drug-like chemical space. Recent advances in catalytic and electrochemical methods now allow site-selective installation of fluorine atoms under mild, scalable conditions. Collectively, these developments have accelerated the translation of fluorinated building blocks into therapeutic agents across oncology, infectious disease and central nervous system disorders.

Research from Nature Portfolio

Recent studies have demonstrated the power of iodine-based organocatalysis to construct complex fluorinated motifs with high efficiency and modularity. One approach employs a cascade sequence that unites acid-mediated activation of cyclobutanols with an I(I)/I(III) catalytic cycle, yielding gem-difluorinated tetralin cores in a single operation. The method tolerates diverse aryl and heteroaryl substituents, providing a versatile platform for rapid analogue synthesis. A complementary strategy exploits enynes as substrates for regioselective 1,1-difluorination via in situ generation of λ3-iodanes. This protocol circumvents the need for pre-functionalised styrene derivatives and delivers homopropargylic difluorides in excellent yields across a broad substrate scope. Both innovations underscore the expanding potential of main-group catalysis to access fluorinated scaffolds of immediate relevance to medicinal chemistry.

Fluorinated Compounds in Medicinal Chemistry publication trend

The graph below shows the total number of articles in fluorinated compounds in medicinal chemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Bioisosterism: Replacement of an atom or group by another with similar physical or chemical properties to maintain biological activity.

Lipophilicity (log P): A measure of a compound’s preference for lipid versus aqueous environments, influencing absorption and distribution.

Hypervalent iodine reagent: An iodine compound with formal valence exceeding three, employed to transfer fluorine electrophilically.

Vicinal difluorination: Introduction of two fluorine atoms on adjacent carbon centres of an alkene or alkyne precursor.

Conformational bias: Preference of a molecule to adopt certain geometries due to intramolecular interactions, such as C–F dipole effects.

References

1. Integrating I(I)/I(III) catalysis in reaction cascade design enables the synthesis of gem-difluorinated tetralins from cyclobutanols. Nature Communications (2023).
2. Regioselective, catalytic 1,1-difluorination of enynes. Nature Chemistry (2023).
3. Electrochemical Vicinal Difluorination of Alkenes: Scalable and Amenable to Electron‐Rich Substrates. Angewandte Chemie International Edition (2019).
4. Reducing the Lipophilicity of Perfluoroalkyl Groups by CF2–F/CF2–Me or CF3/CH3 Exchange. Journal of Medicinal Chemistry (2018).
5. The C–F bond as a conformational tool in organic and biological chemistry. Beilstein Journal of Organic Chemistry (2010).