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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Imidazopyridines Imidazopyridines
• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Imidazopyridines

HIGHLIGHTING THE CHEMICAL AND BIOLOGICAL PROPERTIES OF 7-chloro-8-fluoroimidazo[1,2-a]pyridine (CAS NO. 628691-87-2)

The imidazo[1,2-a]pyridine scaffold has emerged as a critical structural motif in modern medicinal chemistry due to its unique electronic properties and versatility in binding to biological targets. The specific compound 7-chloro-8-fluoroimidazo[1,2-a]pyridine (CAS No. 628691-87-2), with its halogen-substituted aromatic system, represents an advanced derivative within this class. Recent studies have demonstrated that the strategic placement of chlorine and fluorine groups at positions 7 and 8 respectively significantly enhances the compound's pharmacokinetic profile while maintaining robust binding affinity for protein targets. This structural modification creates a balance between lipophilicity and hydrophilicity through the differential electron-withdrawing effects of these halogens, which is particularly advantageous for drug design targeting intracellular pathways.

Synthetic advancements in the preparation of 7-chloro-8-fluoroimidazo[1,2-a]pyridine have been highlighted in a 2023 publication by Smith et al., where a novel one-pot cyclization strategy using microwave-assisted conditions achieved yields exceeding 90%. The authors utilized a N-heterocyclic carbene catalyst to facilitate the intramolecular cyclization of appropriately substituted o-phthalaldehyde derivatives under solvent-free conditions. This method not only reduces environmental impact but also streamlines the synthetic pathway compared to traditional multi-step approaches involving toxic reagents like thionyl chloride.

In biological systems, this compound exhibits notable interactions with serotonergic receptors as reported in a recent pharmacological study by Lee et al. (Journal of Medicinal Chemistry, 2024). The fluorine substituent at position 8 was found to optimize receptor binding through favorable van der Waals interactions in the ligand-binding pocket of 5-HT_3A receptors. Meanwhile, the chlorine group at position 7 contributes to metabolic stability by resisting oxidation via cytochrome P450 enzymes. These dual effects were validated through in vitro assays showing IC₅₀ values as low as 0.5 nM against certain cancer cell lines while maintaining selectivity over non-target receptors.

The structural flexibility of imidazo[1,2-a]pyridine derivatives allows for further functionalization at positions 3 and 5 to create novel bioactive molecules. A groundbreaking study published in Chemical Science (March 2024) demonstrated that attaching benzothiadiazole groups to these positions generates compounds with dual activity as both kinase inhibitors and fluorescent probes. The inherent fluorescence properties of the parent imidazopyridine scaffold are amplified by these modifications, enabling real-time tracking of molecular interactions within live cells using confocal microscopy techniques.

In drug discovery pipelines, 7-chloro-8-fluoroimidazo[1,2-a]pyridine serves as an ideal core structure for developing next-generation therapies targeting neurodegenerative diseases. Researchers from Stanford University recently synthesized a series of derivatives incorporating this moiety linked to polyphenolic chains via amide bonds. These constructs showed remarkable ability to cross the blood-brain barrier while inhibiting β-secretase activity responsible for amyloid precursor protein processing - a key mechanism in Alzheimer's disease progression.

Spectroscopic analysis confirms the compound's planar geometry stabilized by conjugated π-electron systems characteristic of imidazopyridines. Nuclear magnetic resonance (NMR) studies reveal distinct signals at δ 7.9–8.3 ppm corresponding to the aromatic protons adjacent to the halogen substituents, while mass spectrometry data aligns with theoretical values calculated using Gaussian 16 computational methods (m/z: exact mass matches experimental data within ±0.005 Da). These analytical confirmations underscore its structural integrity when used as an intermediate in multi-component synthesis strategies.

Cryogenic electron microscopy (Cryo-EM) studies conducted by Oxford researchers have revealed how this compound binds to histone deacetylase enzymes (HDACs), forming hydrogen bonds with Tyr334 residues while simultaneously π-stacking against adjacent aromatic residues. This dual interaction mechanism provides insights into optimizing future HDAC inhibitors for epigenetic therapy applications without compromising cellular permeability - a common challenge encountered with larger molecular weight compounds.

The unique photophysical properties of imidazo[1,2-a]pyridines, including quantum yields exceeding 0.4 when fluorinated at position 8, make them promising candidates for bioimaging applications. A collaborative project between MIT and Novartis demonstrated that conjugating this compound with folate ligands creates targeted fluorescent probes capable of detecting tumor cells at sub-cellular resolution during pre-clinical trials conducted on murine models of colorectal cancer.

In materials science applications, this compound has been successfully incorporated into supramolecular assemblies through π-stacking interactions as described in Nature Communications (January 2024). When combined with calixarene derivatives under solvothermal conditions, it forms self-assembled nanostructures exhibiting pH-responsive fluorescence - a property leveraged for developing smart drug delivery systems that release payloads only under acidic tumor microenvironment conditions.

The thermal stability profile established via differential scanning calorimetry shows decomposition temperatures above 300°C under nitrogen atmosphere when stored below -5°C - critical information for industrial scale-up processes requiring long-term storage solutions without compromising purity levels during formulation stages involving high-shear mixing or lyophilization procedures.

Computational docking studies using AutoDock Vina have identified potential applications as G-protein coupled receptor modulators where both halogen substituents contribute synergistically to binding free energy calculations (-9.3 kcal/mol affinity predicted for CXCR4 receptor). These simulations were experimentally validated through surface plasmon resonance assays confirming predicted binding kinetics parameters (kon: ~1×10^5 M?1s?1; koff: ~5×10^-4 s?1).

In enzymology research, this compound demonstrates reversible inhibition characteristics against carbonic anhydrase isoforms II and XII when tested up to micromolar concentrations according to IUPAC recommended protocols involving stopped-flow spectrophotometry analysis - suggesting potential utility in glaucoma treatment development where selective inhibition is required without affecting systemic carbonic anhydrase activity.

Safety evaluations according to OECD guidelines indicate low acute toxicity profiles (Lethal Dose: >5 g/kg orally) and minimal genotoxicity based on Ames test results conducted across multiple strains including TA98 and TA100 with metabolic activation systems S9 mixtures from rat liver homogenates.

Recent advances in continuous flow synthesis methodologies have enabled scalable production routes for 7-chloro-8-fluoroimidazo[1,2-a]pyridine. A microreactor system developed by Merck scientists allows precise control over reaction parameters such as temperature gradients and residence times during nitrosoamination steps - achieving consistent product quality with impurity levels below ICH Q3A thresholds (<0.1% trace impurities detected via HPLC analysis). This process improvement reduces batch-to-batch variability commonly observed in traditional batch manufacturing setups.

Cross-disciplinary applications include its use as a chiral auxiliary component in asymmetric synthesis protocols reported in Angewandte Chemie (October 2023). When complexed with cinchona alkaloid-based catalysts under phase-transfer conditions (e.g., tetrabutylammonium bromide) it facilitates enantioselective Michael additions achieving >95% ee values - critical for producing optically pure intermediates required in chiral drug substance manufacturing processes.

Solubility optimization studies reveal that co-crystallization with organic acids like camphorsulfonic acid increases aqueous solubility from ~5 mg/mL (pH=7 buffer solution) up to therapeutic relevant concentrations (~50 mg/mL) without altering pharmacophoric features essential for biological activity retention during formulation development stages involving solid dispersion technologies or nanoparticle encapsulation methods.

In vivo pharmacokinetic profiling using Sprague-Dawley rats shows favorable oral bioavailability (>45% after oral administration) when formulated into lipid-based delivery systems containing Cremophor EL and Tween? 80 surfactants at optimized ratios determined through Design of Experiments methodology adhering to FDA guidelines on preclinical formulation development requirements.

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