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3‑Iodopyridin‑2‑amine is a highly valuable and versatile halogenated heterocyclic building block in synthetic organic chemistry, distinguished by the presence of an iodine substituent at the 3‑position and a primary amino group (‑NH₂) at the 2‑position of the pyridine ring. This unique structural arrangement imparts a multifaceted reactivity profile, making it an indispensable intermediate in modern synthetic design. The iodine atom at the 3‑position acts as a highly effective electrophilic site, readily participating in a variety of metal‑catalyzed cross‑coupling reactions-including Suzuki–Miyaura, Stille, Negishi, Sonogashira, and Buchwald–Hartwig couplings. These transformations enable the efficient introduction of diverse carbon‑based substituents, facilitating the construction of complex biaryl, alkynyl, and heteroaryl frameworks that are central to the synthesis of many bioactive molecules and functional materials. Concurrently, the ortho‑amino group at the 2‑position exerts a powerful directing effect in regioselective metalation reactions, such as lithiation or magnesiation, guiding subsequent functionalization to specific ring positions. Furthermore, the amino group can undergo extensive derivatization through acylation, alkylation, sulfonylation, diazotization, or condensation reactions, providing access to a broad array of nitrogen‑containing derivatives, including fused heterocyclic systems like imidazopyridines, triazolopyridines, and other polycyclic scaffolds. The electron‑donating nature of the amino group also modulates the electronic density of the pyridine ring, enhancing the stability of the molecule and fine‑tuning the reactivity of the iodine leaving group. Owing to these synergistic structural and electronic properties, 3‑iodopyridin‑2‑amine is extensively utilized in the pharmaceutical industry for the preparation of drug candidates, particularly kinase inhibitors, GPCR ligands, and CNS‑active agents. It also plays a vital role in agrochemical development, the design of catalytic ligands, and the synthesis of advanced functional materials, solidifying its status as a pivotal intermediate for constructing complex nitrogen‑containing molecular architectures.
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C.F |
C5H5BrN2 |
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E.M |
172 |
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M.W |
173 |
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m/z |
172 (100.0%), 174 (97.3%), 173 (5.4%), 175 (5.3%) |
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E.A |
C, 34.71; H, 2.91; Br, 46.18; N, 16.19 |
It (chemical formula: C5H5IN2) is an organic compound, and its molecular structure features involve its atomic composition, bond length, bond angle, charge distribution and solid configuration.
1. Atomic composition:
It is composed of four elements: carbon, hydrogen, nitrogen, and iodine. It contains a unique iodine atom (I) connected to the pyridine ring at position 2, a nitrogen atom (N) connected to the pyridine ring at position 2, and a circular structure formed by five carbon atoms (C) and five hydrogen atoms (H).
2. Key length and key angle:
In the 3-Iodopyridin-2-amine molecule, the Carbon–carbon bond and carbon nitrogen bond in the pyridine ring usually have similar bond lengths. The iodine carbon bond between the iodine atom and the carbon atom on the pyridine ring is usually longer. In addition, the bond length of carbon nitrogen bonds is also affected by the substituents connected to nitrogen atoms.
The bond angle between adjacent atoms depends on the lattice arrangement in the molecule and the influence of substituents. The carbon atoms on the pyridine ring typically have a bond angle of approximately 120 °, while the bond angle of carbon nitrogen iodine may vary slightly.
3. Charge distribution:
The charge distribution of different atoms in a molecule is influenced by the polarity of the bond. Due to the fact that iodine atoms are more electronegative than nitrogen and carbon atoms, the iodine atoms of it molecules attract partial charges, causing them to carry partial negative charges within the molecule. In addition, due to the connection of an amino group (- NH2) to the nitrogen atom, the electron density around the nitrogen atom is higher.
4. Stereoscopic configuration:
The three-dimensional configuration of product can be described by the spatial arrangement of Chemical bond and substituents. The carbon atoms in the pyridine ring have a planar configuration, while the carbon nitrogen bond and carbon iodine bond allow for a certain degree of free rotation.
In addition, in the it molecule, the amino groups connected to the nitrogen atom have the ability to rotate freely, so it can adopt different conformations.
3-Iodopyridin-2-amine, also known as 2-amino-3-iodo-pyridine, is an important organic compound with a wide range of applications.
Medical field
Drug synthesis intermediates
As an intermediate in drug synthesis, it has important application value in the pharmaceutical industry. It can participate in the synthesis process of various drugs, introducing specific functional groups or structural features into drug molecules, thereby endowing drugs with specific pharmacological activities. For example, it can be used to synthesize drugs for the treatment of digestive system diseases, such as piperacillin and other anti ulcer drugs. These drugs play an important role in the treatment of gastric and duodenal ulcers, bringing good news to patients.
Antibacterial and antifungal drugs
It can also be used to synthesize compounds with antibacterial and antifungal activity. These compounds can inhibit the growth and reproduction of bacteria or fungi, thus playing an important role in the treatment of infectious diseases. Through rational drug design and synthesis strategies, more efficient and safe antibacterial and antifungal drugs can be developed, providing more choices for clinical treatment.
Anti AIDS drugs
In addition, it can also be used to synthesize diazepine anti AIDS drugs. These drugs can inhibit the replication and transmission of AIDS virus, thus playing an important role in the treatment of AIDS. With the deepening of research and the continuous progress of technology, it is believed that more anti AIDS drugs based on it will be developed in the future to bring better treatment effects to AIDS patients.
Pesticide field
Insecticide:In addition to herbicides, it can also be used for synthesizing insecticides. These insecticides can kill or drive away pests, thereby protecting crops from pest infestations. By using these insecticides reasonably, farmers can ensure the healthy growth of crops and reduce the harm of pests to crops.
Herbicide
In the field of pesticides, it can be used as a synthetic raw material for herbicides. These herbicides can selectively kill or inhibit the growth of weeds, thereby protecting the normal growth and development of crops. By using these herbicides, farmers can more effectively control the harm of weeds and improve crop yield and quality.
Organic synthesis field
It also has important application value in the field of organic synthesis. It can be used as one of the raw materials for synthesizing nitrogen-containing indole derivatives.
These nitrogen-containing indole derivatives have unique chemical structures and properties, and have broad application prospects in fields such as medicinal chemistry and materials science. Through reasonable synthesis strategies and methods, nitrogen-containing indole derivatives with specific structures and properties can be prepared, providing more choices for research and applications in related fields.
In addition, it can also be used for synthesizing highly selective tyrosine kinase inhibitors. Tyrosine kinases are an important class of enzymes that play crucial roles in cell signaling and proliferation regulation. By inhibiting the activity of tyrosine kinases, cell signaling pathways can be blocked, thereby inhibiting the growth and proliferation of tumor cells. Therefore, highly selective tyrosine kinase inhibitors have important application value in tumor treatment.
Materials Science Field
Polymer material modification:In addition, it can also be used for the modification of polymer materials. By introducing its derivatives into polymer materials, the properties of polymer materials can be improved, such as increasing heat resistance, corrosion resistance, mechanical strength, etc. These modified polymer materials have broad application prospects in fields such as aerospace, automotive manufacturing, and building materials.
Functional materials:
It also has potential application value in the field of materials science. It can be used as one of the raw materials for synthesizing functional materials. By introducing specific functional groups or structural features, functional materials with special properties and functions can be prepared. These functional materials have broad application prospects in fields such as electronics, optics, and magnetism. For example, they can be used to prepare the light-emitting layer of organic light-emitting diodes (OLEDs), the light absorbing layer of organic solar cells, and so on.
Antibacterial or antifungal activity: Some pyridine compounds have antibacterial or antifungal activity. Although the existence of this activity has not been clearly confirmed, considering its structural characteristics, it may have certain antibacterial or antifungal potential. This needs to be further verified through experiments.
Precautions
Toxicity assessment:
When evaluating biological activity, its potential toxic effects must be considered. This compound has a certain degree of acute toxicity, so it needs to be handled with caution when used to avoid harm to humans or the environment.
Experimental conditions:
The evaluation of biological activity is often influenced by experimental conditions. Therefore, it is necessary to strictly control the experimental conditions during the experiment to ensure the accuracy and reliability of the results.
Further research:
At present, there is insufficient research on its biological activity. In order to gain a more comprehensive understanding of the biological activity of this compound, more experiments and research work are needed.
Current Challenges and Future Directions
● Synthetic Challenges
Regioselectivity: Despite advances in synthetic methodology, achieving high regioselectivity in the iodination of pyridin-2-amine remains a challenge. Further research into catalytic systems and reaction conditions is needed to improve selectivity.
Sustainability: The use of hazardous reagents and the generation of waste in current synthetic routes pose environmental concerns. Developing greener synthetic methods, such as flow chemistry or biocatalysis, is essential for sustainable production.
● Biological Challenges
Toxicity: While 3-iodopyridin-2-amine derivatives have shown promise in various applications, their potential toxicity must be thoroughly evaluated. Understanding the mechanisms of action and potential side effects is crucial for drug development.
Drug Resistance: In antimicrobial applications, the emergence of resistance is a significant concern. Designing compounds with novel modes of action and low resistance potential is a priority.
● Future Directions
Multifunctional Compounds: Exploring the synthesis of multifunctional compounds that combine multiple biological activities, such as anticancer and antimicrobial properties, could lead to the development of next-generation therapeutics.
Advanced Materials: Continuing research into the use of 3-iodopyridin-2-amine in materials science, particularly in the development of high-performance OLEDs and DSSCs, could yield breakthroughs in renewable energy and display technologies.
Collaborative Research: Encouraging collaboration between academic and industrial researchers can accelerate the translation of basic research into practical applications. Partnerships can facilitate the development of scalable synthetic processes and the evaluation of compounds in real-world settings.
3-Iodopyridin-2-amine is a versatile heterocyclic compound with significant applications in pharmaceuticals, agrochemicals, and materials science. Despite the challenges associated with its synthesis and handling, ongoing research is focused on developing more efficient and sustainable methods for its production. The unique reactivity of 3-iodopyridin-2-amine, particularly its ability to undergo cross-coupling reactions, makes it an invaluable building block for the synthesis of complex molecules. As industries continue to seek innovative solutions to global challenges, 3-iodopyridin-2-amine is poised to play an increasingly important role in the development of next-generation materials and therapeutics.
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