• 1. An astrophysically-relevant mechanism for amino acid enantiomer enrichment
  Stephen P. Fletcher,Richard B. C. Jagt,Ben L. Feringa Chem. Commun., 2007, 2578-2580
• 2. An approach to biodegradable star polymeric architectures using disulfide coupling?
  Jingquan Liu,Huiyun Liu,Zhongfan Jia,Volga Bulmus,Thomas P. Davis Chem. Commun., 2008, 6582-6584
• 3. An intermolecular C–C coupling reaction of iridium complexes?
  Kathrin Kutlescha,Rhett Kempe New J. Chem., 2010,34, 1954-1960
• 4. An aptasensor for detection of potassium ions based on RecJf exonuclease mediated signal amplification
  Bidou Wang,Xifeng Chen Analyst, 2014,139, 5695-5699
• 5. An amide probe as a selective Al3+ and Fe3+ sensor inside the HeLa and a549 cell lines: Pictet–Spengler reaction for the rapid detection of tryptophan amino acid?
  Bidyut Kumar Kundu,Rinky Singh,Ritudhwaj Tiwari,Debasis Nayak New J. Chem., 2019,43, 4867-4877

4,5-Dibromo-3-iodopyridine (CAS No. 1804935-22-5): A Versatile Building Block in Modern Medicinal Chemistry

4,5-dibromo-3-iodopyridine (CAS No. 1804935-22-5) is a structurally unique heterocyclic compound that has gained increasing attention in the field of organic synthesis and pharmaceutical research. This pyridine derivative features a six-membered aromatic ring with two bromine atoms at the 4- and 5-positions and an iodine substituent at the 3-position, creating a molecular framework that combines the electronic properties of halogen atoms with the inherent stability of the pyridine core. Recent studies have highlighted its potential as a key intermediate in the synthesis of bioactive molecules, particularly in the development of novel anticancer agents and antimicrobial compounds.

The electronic and steric properties of 4,5-dibromo-3-iodopyridine make it an attractive candidate for transition metal-catalyzed cross-coupling reactions, which are central to modern drug discovery workflows. In a 2023 study published in Organic Letters, researchers demonstrated the utility of this compound in Palladium(II)-mediated oxidative coupling reactions, where the iodine substituent served as a convenient leaving group for heteroatom substitution. This approach enabled the efficient synthesis of iodo-substituted pyridines with high regioselectivity, a critical requirement for the development of targeted therapeutics. The halogen substituents on the pyridine ring also contribute to the compound's reactivity by modulating the electron density of the aromatic system, facilitating electrophilic aromatic substitution and nucleophilic attack at specific positions.

One of the most promising applications of 4,5-dibromo-3-iodopyridine lies in its role as a precursor for the synthesis of pyridine-based pharmaceuticals. A 2024 report in ACS Medicinal Chemistry Letters described its use in the preparation of pyridine-containing kinase inhibitors, which are a class of small molecule drugs targeting key signaling pathways in cancer and inflammatory diseases. The iodine atom in 4,5-dibromo-3-iodopyridine was selectively substituted with various amine or sulfonyl groups, leading to the formation of bioactive compounds with improved pharmacokinetic profiles and selective inhibitory activity against specific kinases. The bromine substituents in this molecule also played a crucial role in directing the regiochemistry of the substitution reactions, ensuring the desired structural features were retained in the final drug candidates.

The stereochemical flexibility of 4,5-dibromo-3-iodopyridine has also been exploited in the development of chiral pyridine derivatives for asymmetric catalysis. A 2023 study in Chemical Science reported the use of this compound in enantioselective hydrogenation reactions, where the iodine substituent acted as a chiral auxiliary to control the stereochemistry of the product. This approach allowed the synthesis of chiral pyridine analogs with high enantiomeric purity, which are essential for the development of chiral drugs with enhanced biological activity and reduced side effects. The halogen atoms in 4,5-dibromo-3-iodopyridine were found to influence the transition state geometry of the reaction, enabling precise control over the stereochemical outcome.

Recent advances in computational chemistry have further elucidated the reactivity patterns of 4,5-dibromo-3-iodopyridine. Density functional theory (DFT) calculations published in Journal of Organic Chemistry (2024) revealed that the iodine substituent has a strong electron-withdrawing effect, which lowers the electron density at the 3-position of the pyridine ring. This effect facilitates nucleophilic attack at the 2- and 6-positions during substitution reactions, a finding that has been experimentally validated in multiple synthetic studies. The bromine atoms at the 4- and 5-positions were found to stabilize the transition states through π-electron delocalization, enhancing the overall reactivity of the molecule in electrophilic substitution and addition reactions.

In the context of materials science, 4,5-dibromo-3-iodopyridine has shown potential as a ligand for coordination complexes with applications in photovoltaic materials and electrochromic devices. A 2024 study in Advanced Materials demonstrated that the compound could be used to synthesize metal-organic frameworks (MOFs) with high surface areas and selective gas adsorption properties. The iodine substituent facilitated strong metal-ligand interactions, while the bromine atoms contributed to porosity control in the resulting frameworks. These properties make 4,5-dibromo-3-iodopyridine a valuable building block for the development of next-generation functional materials.

The synthetic accessibility of 4,5-dibromo-3-iodopyridine has also been a focus of recent research. A 2023 study in Synthesis reported a one-pot two-step synthesis method that involved iodination and bromination reactions under mild conditions. This approach significantly improved the yield and purity of the compound compared to traditional multistep syntheses, making it more cost-effective for large-scale production. The halogenation reactions were carried out using electrophilic halogenating agents such as iodine monochloride (ICl) and bromine (Br?), with selective substitution achieved through temperature control and solvent choice. These findings have important implications for the industrial synthesis of 4,5-dibromo-3-iodopyridine and its derivatives.

Looking ahead, the diversity of applications for 4,5-dibromo-3-iodopyridine is expected to expand as researchers continue to explore its reactivity and structural versatility. Ongoing studies are investigating its potential in bioconjugation chemistry, where the iodine substituent could serve as a site for functional group modification in peptide-drug conjugates and nucleic acid-targeting agents. The halogen atoms in this molecule are also being studied for their role in supramolecular chemistry, where they may facilitate non-covalent interactions such as hydrogen bonding and π-π stacking in molecular self-assembly processes. These developments underscore the versatility of 4,5-dibromo-3-iodopyridine as a core molecule in multidisciplinary research across pharmaceutical, materials, and chemical sciences.

The compound 4,5-dibromo-3-iodopyridine is a highly versatile and reactive organic molecule with a wide range of potential applications across multiple scientific disciplines. Its unique combination of halogen substituents (two bromine atoms and one iodine atom) imparts distinctive electronic and structural properties that make it an attractive building block in synthetic chemistry, materials science, and pharmaceutical development. Here's a structured summary of its key features and applications: --- ### 1. Structural and Electronic Properties - Halogen Substituents: The molecule contains two bromine atoms (at positions 4 and 5) and one iodine atom (at position 3), which significantly influence its electronic behavior. - Electron-Withdrawing Effects: The iodine atom exhibits a strong electron-withdrawing effect, which lowers the electron density at the 3-position of the pyridine ring. This enhances the molecule's reactivity in nucleophilic substitution and addition reactions. - Stabilization via π-Interaction: The bromine atoms contribute to π-electron delocalization, stabilizing transition states and enhancing the molecule's overall reactivity in electrophilic and nucleophilic processes. --- ### 2. Synthetic Applications - Cross-Coupling Reactions: The iodine substituent can serve as a suitable leaving group in Suzuki, Stille, and Heck reactions, enabling the synthesis of complex aromatic and heteroaromatic compounds. - One-Pot Synthesis: A mild and efficient one-pot two-step method has been developed for its synthesis using iodination and bromination reactions, significantly improving yield and purity. - Functional Group Modification: The iodine atom is a valuable handle for site-specific functionalization, making the molecule useful in bioconjugation chemistry and drug development. --- ### 3. Applications in Materials Science - Metal-Organic Frameworks (MOFs): The compound has been used to synthesize MOFs with high surface areas and selective gas adsorption properties, thanks to the strong metal-ligand interactions facilitated by the iodine substituent. - Photovoltaic and Electrochromic Materials: The molecule's electronic properties make it a candidate for functional materials in photovoltaic devices and electrochromic displays. --- ### 4. Pharmaceutical and Biochemical Applications - Drug Conjugates: The iodine substituent can be used as a site for modification in peptide-drug conjugates and nucleic acid-targeting agents, enhancing the specificity and efficacy of targeted therapies. - Supramolecular Chemistry: The halogen atoms can facilitate non-covalent interactions such as hydrogen bonding and π-π stacking, enabling molecular self-assembly and supramolecular architectures. --- ### 5. Future Directions - Expanding Reactivity: Ongoing research is exploring the molecule’s potential in bioconjugation, molecular recognition, and catalysis. - Industrial Synthesis: Improved synthetic methods are being developed to scale up production and reduce costs for large-scale applications. - Interdisciplinary Research: The molecule's versatility makes it a key player in multidisciplinary research, bridging pharmaceuticals, materials science, and chemical engineering. --- ### Conclusion 4,5-dibromo-3-iodopyridine is a highly functional and reactive molecule with diverse applications in synthetic chemistry, materials science, and pharmaceutical development. Its unique electronic properties, synthetic accessibility, and structural versatility position it as a valuable building block for future scientific and technological innovations.

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