Fluorinated compounds
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High-purity fluorinated compounds including aryl fluorides, trifluoromethyl building blocks, fluorinated heterocycles, and nucleosides for medicinal chemistry and API synthesis. Strategic fluorination to enhance metabolic stability, lipophilicity, and target binding affinity.
Why Fluorine Matters in Drug Design
A single fluorine atom can transform a drug candidate's pharmacokinetic and pharmacodynamic profile. Here are the four key effects that make fluorination indispensable in modern medicinal chemistry.
Metabolic Stability
The ultra-strong C-F bond resists oxidative metabolism by CYP450 enzymes, prolonging drug half-life and reducing formation of toxic metabolites. Fluorine is routinely placed at metabolically labile positions to block degradation.
Lipophilicity & Permeability
Trifluoromethyl (-CF3) and difluoromethyl (-CF2H) groups significantly increase lipophilicity, enhancing passive membrane permeability and oral bioavailability. This is critical for drugs targeting intracellular or CNS targets.
Binding Affinity & Selectivity
Fluorine's high electronegativity alters electronic distribution and pKa values, strengthening hydrogen bonds and dipole interactions with target proteins. Strategic fluorination can dramatically improve both potency and target selectivity in SAR studies.
Bioisosterism
Fluorine serves as a near-perfect bioisostere for hydrogen (similar size) and hydroxyl (CF2H as H-bond donor). This allows medicinal chemists to fine-tune receptor binding without significant steric disruption, accelerating lead optimization.
What Are Fluorinated Compounds?
Fluorinated compounds are organic molecules containing one or more fluorine atoms, widely used as building blocks and intermediates in pharmaceutical synthesis, agrochemical development, and materials science. The strategic incorporation of fluorine into molecular scaffolds dramatically alters physicochemical and biological properties, making these compounds among the most valuable tools in modern medicinal chemistry.
The unique properties of fluorine — a small atomic radius (1.47 Å), the highest electronegativity (3.98) of any element, and an extremely strong carbon-fluorine bond (485 kJ/mol, compared to 413 kJ/mol for C-H) — make fluorinated building blocks indispensable for drug discovery. Fluorine can block metabolic oxidation at labile positions, enhance passive membrane permeability through increased lipophilicity, modulate pKa values and electrostatic interactions to improve receptor binding, and serve as a near-perfect bioisostere for hydrogen or hydroxyl groups without significant steric disruption.
With up to 50% of FDA-approved small-molecule drugs containing fluorine in recent years — and 12 new fluorinated drugs approved in 2023 alone, including Sotorasib (Lumakras), the first direct KRAS inhibitor, and Belzutifan (Welireg), the first HIF-2α inhibitor — sourcing high-quality fluorinated building blocks is critical for pharmaceutical R&D teams engaged in lead optimization, structure-activity relationship (SAR) studies, and API development. ACUBIOCHEM provides a comprehensive catalog of fluorinated intermediates, backed by rigorous quality control including 19F NMR, ion chromatography fluorine quantification, and ICP-MS metal residue analysis.
Fluorinated Building Block Classes & Applications
Our portfolio covers all major fluorinated motifs used in modern drug discovery. Explore the chemical classes, their unique properties, and key pharmaceutical applications below.
🧬 Aryl Fluorides & Fluorinated Aromatics
Fluorobenzenes, fluorophenols, fluorobenzophenones, and fluorinated aryl nitriles. Aryl fluorides are widely used to block metabolic oxidation of aromatic rings and enhance binding affinity. The electron-withdrawing nature of fluorine modulates ring electronics, making these building blocks essential for API synthesis and SAR optimization.
⚡ Trifluoromethyl & Polyfluorinated Blocks
Trifluoromethyl (-CF3) compounds, difluoromethyl (-CF2H) intermediates, and polyfluorinated building blocks. The CF3 group is highly lipophilic and strongly electron-withdrawing, enhancing metabolic stability, cell membrane permeability, and target binding affinity. CF2H serves as a hydrogen bond donor and hydroxyl bioisostere. These are among the most widely used fluorinated motifs in modern drug discovery.
🔬 Fluorinated Heterocycles
Fluoroisatins, fluoropyridines, fluoropyrimidines, and five- and six-membered fluorinated heterocyclic building blocks. Fluorinated heterocycles are core scaffolds in kinase inhibitors, protease inhibitors, and targeted cancer therapeutics. The combination of heterocyclic pharmacophores with strategic fluorination yields compounds with enhanced potency and selectivity. Recent advances in directly-fluorinated five-membered heterocycles show significant anticancer and antimicrobial activities.
🧬 Fluorinated Nucleosides & Specialized Intermediates
5-Fluorouracil derivatives, fluorinated nucleosides, fluorinated amino acids, and specialized fluorinated intermediates for advanced research. Fluorinated nucleosides are foundational in antiviral and anticancer drug development — acting as chain terminators or metabolic inhibitors. Fluorinated amino acids serve as 19F NMR probes for protein conformation studies and 18F PET imaging precursors.
Fluorine in Approved Drugs
From cardiovascular to oncology to infectious disease, fluorinated building blocks power some of the most important medicines of our time. Here are eight landmark drugs that rely on strategic fluorination.
Atorvastatin
Fluorophenyl group enhances HMG-CoA reductase binding affinity. World's best-selling drug of all time, lowering LDL cholesterol.
Sitagliptin
Trifluoromethyl group enhances DPP-4 inhibitor potency and metabolic stability. First-in-class oral treatment for type 2 diabetes.
5-Fluorouracil
Fluorine at C5 position inhibits thymidylate synthase, blocking DNA synthesis. Foundation of colorectal, breast, and GI cancer chemotherapy for 60+ years.
Sofosbuvir
2'-Fluoro on sugar moiety enhances metabolic stability and polymerase inhibition. Revolutionized hepatitis C treatment with >95% cure rates.
Emtricitabine
Fluorine at 5-position of cytosine enhances metabolic stability and antiviral potency. Core component of HIV PrEP and combination therapy regimens.
Sotorasib
Fluorinated heterocyclic scaffold enables covalent binding to KRAS G12C. First-ever direct KRAS inhibitor approved, targeting the "undruggable" oncogene in NSCLC.
Fluoxetine
p-Trifluoromethyl group on phenoxy ring enhances serotonin reuptake inhibitor potency and CNS penetration. Pioneered the SSRI class of antidepressants.
Belzutifan
Fluorinated indole scaffold stabilizes HIF-2α binding. First-in-class HIF-2α inhibitor for von Hippel-Lindau disease-associated renal cell carcinoma.
Fluorination Strategies in Drug Synthesis
There are three primary approaches to incorporating fluorine into drug molecules. Each has distinct advantages and limitations, and the choice depends on your synthetic route, target complexity, and project stage.
Building Block Approach
Incorporate pre-fluorinated intermediates (like those in our catalog) early in the synthetic route. The fluorine atom is already in place, and standard coupling reactions build the rest of the molecule around it.
Direct Fluorination
Use specialized fluorinating reagents (DAST, Deoxo-Fluor, Selectfluor, NFSI, SF4) to introduce fluorine at specific positions in intermediate molecules during synthesis. Common for converting alcohols to fluorides or electrophilic aromatic fluorination.
Late-Stage Fluorination
Introduce fluorine at the final or near-final stage of synthesis, often using C-H activation, photocatalysis, or electrochemical fluorination. Allows rapid generation of fluorinated analogs from a common advanced intermediate for SAR studies.
Key Research Applications
Fluorinated building blocks power critical workflows across drug discovery, from lead optimization to advanced biophysical studies.
Metabolic Stability Enhancement
The strong C-F bond blocks metabolic oxidation of aromatic rings and alkyl groups, prolonging drug half-life and reducing toxic metabolite formation. Fluorination is the most widely used strategy to improve pharmacokinetic properties.
SAR & Medicinal Chemistry
Modular fluorinated building blocks enable systematic structure-activity relationship (SAR) studies. Fluorine bioisosterism replaces hydrogen or hydroxyl to fine-tune binding affinity, selectivity, and pKa, accelerating lead optimization.
Antiviral & Anticancer Research
Fluorinated nucleosides act as chain terminators in viral replication and tumor DNA synthesis. Building blocks for 5-FU derivatives, Sofosbuvir analogs, and Emtricitabine-like compounds are core to antiviral and anticancer drug development.
Imaging & Biophysical Probes
19F NMR spectroscopy uses fluorinated compounds as sensitive probes to study protein conformation, ligand binding, and membrane dynamics. 18F-labeled precursors enable PET molecular imaging, including reporter gene imaging for gene therapy.
Quality Control Challenges for Fluorinated Compounds
Fluorinated compounds present unique QC challenges that standard analytical methods may not fully address. Here are the five most critical issues — and how ACUBIOCHEM ensures every batch meets the highest standards.
Fluorine Content Quantification
Positional Isomer Separation
Residual Fluorinating Reagents
Defluorination & Storage Stability
Metal Catalyst Residues
Why Researchers Choose ACUBIOCHEM
Trusted by pharmaceutical and biotech R&D teams worldwide for high-quality fluorinated building blocks and reliable service.
Purity & Quality Control
Every product shipped with a Certificate of Analysis (COA). Most batches include HPLC, 1H NMR, 19F NMR, and MS characterization. Advanced testing (IC fluorine quantification, ICP-MS, chiral HPLC) available upon request.
Custom Synthesis
Custom fluorinated building blocks tailored to your specific SAR needs. From gram to kilogram scale with competitive pricing and fast turnaround.
Reliable Global Supply
Large inventory ready for immediate shipment. DHL/FedEx express delivery worldwide with proper hazardous material documentation and cold chain options.
Technical Support
Expert chemists available for consultation on fluorination strategy, building block selection, and custom synthesis route design for your medicinal chemistry program.
Frequently Asked Questions
Need a Custom Fluorinated Building Block or Bulk Quote?
Our expert chemistry team can design and synthesize custom fluorinated intermediates for your medicinal chemistry program. Contact us for competitive pricing, route proposals, and fast turnaround on custom fluorination projects — from milligram screening quantities to kilogram-scale production.
Browse All Fluorinated Compounds
2-Fluorobenzophenone
Price range: $190.29 through $996.86CAS Number: 342-24-5
Synonyms: Ofluorophenone; Ofluorophenone; 2-fluorophenone; 2-fluorobenzophenone; 2-Fluorobenzophenone 2-fluorophenone; 2-fluorophenone
2,4,6-Trifluorophenol
Price range: $190.29 through $561.43CAS Number: 2268-17-9
Synonyms: 2,4,6-trifluorophenol; 2,4,6-trifluorophenol
2-Fluorobenzophenone
Price range: $190.29 through $996.86CAS Number: 342-24-5
Synonyms: Ofluorophenone; Ofluorophenone; 2-fluorophenone; 2-fluorobenzophenone; 2-Fluorobenzophenone 2-fluorophenone; 2-fluorophenone
2,4,6-Trifluorophenol
Price range: $190.29 through $561.43CAS Number: 2268-17-9
Synonyms: 2,4,6-trifluorophenol; 2,4,6-trifluorphenol?
3,3,3-trifluoro-1-propanol
Price range: $190.29 through $675.43CAS Number: 2240-88-2
Synonyms: 3,3,3-trifluoro-1-propanol; 3,3,3-trifluoropropyl-1-alcohol; 2,3-difluorophenyl alcohol; 3,3,3-Trifluoro-1-propanol 3,3,3-trifluoro-1-propanol; 3,3,3-trifluoropropanol; 3,3,3-trifluoropropane-1-alcohol
4-Fluorobenzimidamide
Price range: $190.71 through $331.71CAS Number: 2339-59-5
Synonyms: 4-flubenzamidine hydrochloride; 4-flulubenzamidine; 4-fluorobenzamide; 4-flubenzamidine hydrochloride monohydrate; 4-flubenzamidine hydrochloride; tetraflubenzamidine hydrochloride
4-Fluorobenzimidamide
Price range: $190.71 through $331.71CAS Number: 2339-59-5
Synonyms: 4-flubenzamidine hydrochloride; 4-flulubenzamidine; 4-fluorobenzamide; 4-flubenzamidine hydrochloride monohydrate; 4-flubenzamidine hydrochloride; tetraflubenzamidine hydrochloride
3-Fluoro-2-iodoaniline
Price range: $191.14 through $594.86CAS Number: 706752-99-0
Synonyms: 3-fluorine-2-iodine aniline
3-Fluoro-2-iodoaniline
Price range: $191.14 through $594.86CAS Number: 706752-99-0
Synonyms: 3-fluorine-2-iodine aniline
5-Fluoro-2′-deoxyuridine
Price range: $194.14 through $1,364.14CAS Number: 50-91-9
Synonyms: floxuridine; Floxuridine; 5-fluorodeoxyuridine; 2 ′ -deoxy-5-fluorouracil nucleoside; 2 ′ -deoxy-5-fluoruridine; 5-fluorine-2 ′ -deoxyuridine; 2 ′ -Deox-5-fluorouridine 2 ′ -deoxy-5-fluoruridine; 2-Deofofuridine; 2-Defluoruridine (fluouureside); 2 ′ -deoxy-5-fluorinated uridine; 2-deO-5-fluoruridine; 5-fluorine-2-deoxyuridine; 5-fluorine-2 -deoxyyurea nucleoside; 5-fluorine-2-deoxyuridine; 5-fluoro-2 ′ -deoxyuridine; 5-fluorine-2 ′ -deoxyuret nucleoside USP standard; 5-fluoro-2 ′ ′ -deoxyuridine; 5-fluorine-2 ′ -deoxyyurea nucleoside; 5-fluorine-2-deoxyurea nucleoside; 5-fluoruracidine deoxynucleoside; Fluorourea glycoside; 5-fluoro-2-deoxyurea nucleoside; 5-fluorine-2 ′ -deoxyyurea nucleoside; floxuridine, Floxuridine, The 5-fluoro-2 ′ -deoxyuret nucleoside
2-Fluoro-4-iodo-3-picoline
Price range: $194.57 through $486.00CAS Number: 153034-80-1
Synonyms: 2-fluorine-3-methyl-4-iodopyridine; 2-fluorine-4-iodo-3-methylpyridine