1-(2-Fluoropyridin-4-yl)ethan-1-one: Properties & Applications
1-(2-Fluoropyridin-4-yl)ethan-1-one: Properties & Applications
1-(2-Fluoropyridin-4-yl)ethan-1-one is a fluorinated heteroaromatic ketone that serves as a versatile building block in medicinal chemistry and drug discovery programs targeting pyridine-based scaffolds.
- IUPAC Name
- 1-(2-Fluoropyridin-4-yl)ethan-1-one
- Molecular Formula
- C₇H₆FNO
- Molecular Weight
- 139.13 g/mol
- Key Functional Groups
- Aromatic ketone, fluoropyridine ring
- Primary Use
- Synthetic intermediate and building block in heterocyclic chemistry
- SKU
- E727681
Chemical Structure and Properties
1-(2-Fluoropyridin-4-yl)ethan-1-one features a pyridine ring substituted with a fluorine atom at the 2-position and an acetyl (methyl ketone) group at the 4-position. This combination of a strongly electron-withdrawing fluorine substituent and a ketone carbonyl on the aromatic heterocycle results in a compound with a pronounced electron-deficient character at the ring. The molecular formula is C₇H₆FNO with a molecular weight of approximately 139.13 g/mol.
The fluorine atom at the ortho position relative to the ring nitrogen enhances the electrophilicity of the pyridine ring, making it susceptible to nucleophilic aromatic substitution (SNAr) reactions under appropriate conditions. The ketone moiety provides an additional reactive handle for condensation, reduction, and other carbonyl-centered transformations, greatly expanding the synthetic utility of this compound.
Synthesis and Reactivity
Fluorinated pyridine ketones such as 1-(2-Fluoropyridin-4-yl)ethan-1-one are generally accessible through directed metalation strategies, Friedel-Crafts acylation of fluoropyridines, or cross-coupling approaches applied to suitably halogenated precursors. The electron-deficient nature of the 2-fluoropyridine ring facilitates nucleophilic aromatic substitution, allowing displacement of the fluorine by amines, alcohols, or thiol nucleophiles to yield diverse 2-substituted pyridine-4-yl ketone derivatives.
The acetyl group can participate in aldol-type condensations, Knoevenagel reactions, and reductive amination sequences, providing access to chiral amine intermediates of pharmaceutical relevance. These combined reactivities make the compound a convergent node in multi-step synthesis workflows.
Applications in Medicinal Chemistry and Drug Discovery
Fluorinated pyridine scaffolds are prominent structural motifs in modern drug discovery due to the ability of fluorine to modulate lipophilicity, metabolic stability, and binding affinity. 1-(2-Fluoropyridin-4-yl)ethan-1-one is employed as a key building block for the preparation of biologically active compounds, including kinase inhibitors and other targeted therapeutics, where the fluoropyridine unit contributes to selective target engagement.
The compound is particularly valuable in fragment-based drug design and lead optimization workflows, where researchers exploit the dual reactive sites—the SNAr-reactive C–F bond and the electrophilic ketone—to rapidly assemble compound libraries. Its use as a precursor in the synthesis of more complex heterocyclic systems further underscores its utility in pharmaceutical research.
Handling, Storage, and Safety Considerations
As with all fine chemical reagents, 1-(2-Fluoropyridin-4-yl)ethan-1-one should be handled using standard laboratory safety precautions. Personnel should wear appropriate personal protective equipment including nitrile gloves, safety glasses, and a laboratory coat. Work should be conducted in a well-ventilated fume hood to avoid inhalation of vapors or dust.
The compound should be stored in a cool, dry place, away from incompatible materials such as strong oxidizers and strong bases. Containers should be kept tightly sealed when not in use to prevent moisture uptake and degradation. Researchers should consult the current Safety Data Sheet (SDS) for complete hazard information before use.
Frequently asked questions
What is 1-(2-Fluoropyridin-4-yl)ethan-1-one used for in research?
It is primarily used as a synthetic building block in medicinal chemistry, serving as a precursor for the preparation of fluoropyridine-containing drug candidates, kinase inhibitor scaffolds, and diverse heterocyclic compounds via nucleophilic aromatic substitution and carbonyl chemistry.
Why is the fluorine substituent at the 2-position of the pyridine ring important?
The fluorine at the 2-position, adjacent to the ring nitrogen, strongly activates the ring toward nucleophilic aromatic substitution (SNAr). This allows selective displacement of fluorine by a range of nucleophiles, enabling rapid diversification of the molecular scaffold for structure-activity relationship studies.
How should 1-(2-Fluoropyridin-4-yl)ethan-1-one be stored to maintain its quality?
The compound should be stored in a tightly sealed container in a cool, dry location away from strong oxidizers and moisture. Always consult the current Safety Data Sheet for specific storage temperature recommendations and hazard information.
What reactive transformations can be performed on the ketone group of this compound?
The ketone group can undergo a range of transformations including reductive amination to yield chiral amines, aldol and Knoevenagel condensations to extend the carbon skeleton, and reduction to the corresponding alcohol. These reactions make it a versatile intermediate for library synthesis.
References
- Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed.; Oxford University Press: Oxford, 2012. (General reference for nucleophilic aromatic substitution and carbonyl chemistry)
- Müller, K.; Faeh, C.; Diederich, F. Fluorine in pharmaceuticals: looking beyond intuition. Science 2007, 317, 1881–1886. doi:10.1126/science.1131943
- Hagmann, W. K. The many roles of fluorine in medicinal chemistry. J. Med. Chem. 2008, 51, 4359–4369. doi:10.1021/jm800219f
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