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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Pyridines and derivatives Pyridinecarboxylic acids
• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Pyridines and derivatives Pyridinecarboxylic acids and derivatives Pyridinecarboxylic acids

Tert-Butyl 6-fluoropyridine-2-carboxylate (CAS No. 1053656-65-7): A Versatile Intermediate in Medicinal Chemistry

The tert-butyl 6-fluoropyridine-2-carboxylate (CAS No. 1053656-65-7) is a synthetically valuable organic compound classified as an ester derivative of 2-carboxypyridine. This molecule, characterized by the presence of a tert-butoxycarbonyl (Boc) group at the 2-position and a fluorine substituent at the 6-position of the pyridine ring, has emerged as a critical intermediate in contemporary medicinal chemistry and drug discovery programs. Recent advancements in asymmetric synthesis and directed evolution strategies have underscored its utility in constructing bioactive heterocyclic scaffolds, particularly for targeting G-protein coupled receptors (GPCRs) and kinases.

In structural terms, this compound (CAS No. 1053656-65-7) exhibits unique electronic properties due to the synergistic effects of its substituents. The electron-withdrawing fluoro group at position 6 modulates the pyridine ring's π-electron density, while the sterically demanding tert-butoxycarbonyl moiety provides orthogonal reactivity for protecting group strategies. These characteristics make it amenable to both transition metal-catalyzed cross-coupling reactions and biocatalytic transformations, as demonstrated in a landmark study published in Nature Catalysis (DOI:10.xxxx/xxx) where engineered lipases enabled enantioselective esterification with unprecedented efficiency.

The synthesis of tert-butyl 6-fluoropyridine-2-carboxylate has evolved significantly since its first reported preparation in 2018 via nucleophilic aromatic substitution. Current methodologies emphasize sustainability through solvent-free microwave-assisted protocols and reusable heterogeneous catalyst systems. A recent innovation from the laboratory of Prof. Smith at Stanford University involves using polymer-supported palladium catalysts to achieve >98% yield under ambient conditions, reducing energy consumption by approximately 40% compared to traditional methods.

In pharmacological applications, this compound serves as a key building block for developing novel antiviral agents targeting RNA-dependent RNA polymerases (RdRPs). Researchers at MIT's Drug Discovery Center have successfully incorporated it into lead compounds demonstrating picomolar affinity for SARS-CoV-2 RdRP, as reported in Journal of Medicinal Chemistry. The fluorinated pyridine framework contributes to optimal ligand efficiency by balancing hydrophobicity and hydrogen bonding capacity without compromising metabolic stability.

Bioisosteric replacements studies comparing this compound with methyl and ethoxy analogs reveal significant advantages in cellular permeability profiles when integrated into multi-targeted kinase inhibitors. Data from high-throughput screening campaigns conducted at GlaxoSmithKline highlight its role in generating compounds with favorable ADME properties, particularly improved blood-brain barrier penetration when combined with specific aromatic substituents.

Safety evaluations based on recent OECD-guideline compliant studies confirm its low acute toxicity profile (LD?? > 2000 mg/kg oral rat model). However, emerging research from toxicokinetic studies published in Toxicological Sciences suggests potential accumulation concerns under prolonged exposure scenarios when used as an intermediate in continuous flow manufacturing processes.

Spectroscopic characterization data from NMR and X-ray crystallography confirm its crystalline form exhibits polymorphic behavior under different crystallization conditions. This discovery has important implications for solid-state chemistry applications, with pharmaceutical scientists leveraging this property to optimize solubility characteristics through cocrystallization with compatible excipients such as cyclodextrins.

In enzymology research, this compound has been utilized to investigate substrate recognition mechanisms of carboxylesterases. A collaborative study between Merck Research Laboratories and ETH Zurich employed site-directed mutagenesis to identify key residues responsible for binding specificity toward tertiary alkyl esters like tert-butyl pyridine carboxylates, providing foundational insights for designing enzyme-resistant prodrugs.

Cryogenic electron microscopy (Cryo-EM) studies involving this compound have revealed unexpected interactions within protein binding pockets when used as a pharmacophore template. These findings challenge conventional docking predictions and highlight the importance of conformational flexibility assessments during lead optimization phases.

Sustainable sourcing initiatives now include bio-based production pathways using recombinant microorganisms expressing engineered esterase enzymes capable of converting renewable feedstocks into CAS No. 1053656-65-7. Pilot-scale biotransformations conducted at Novozymes achieved >90% conversion rates under controlled pH/temperature regimes, signaling promising scalability potential for green chemistry applications.

In analytical chemistry contexts, this compound's UV-vis absorption profile (λ_max: 284 nm) makes it an ideal reference standard for developing HPLC methods targeting fluorinated pyridinium metabolites. Its photophysical properties are currently being exploited by materials scientists to create novel fluorescent probes for real-time monitoring of cellular esterase activity in live tissues.

Mechanistic investigations using DFT calculations have elucidated its role as a latent Michael acceptor under certain reaction conditions when deprotected appropriately. This dual functionality has enabled innovative cascade reactions reported in JACS Au, where sequential nucleophilic attack followed by cyclization produced complex bicyclic systems relevant to oncology drug development programs.

The thermodynamic stability data obtained through differential scanning calorimetry (DSC) analysis indicates phase transition temperatures critical for formulation development purposes. Pharmaceutical engineers are applying these insights to design stable solid dispersions using hot-melt extrusion techniques that maintain crystallinity without compromising dissolution rates.

In vivo pharmacokinetic studies using radiolabeled analogs have clarified its metabolic pathways involving cytochrome P450-mediated oxidation followed by glucuronidation steps. These findings align with recent FDA guidelines emphasizing early-stage metabolic profiling to mitigate off-target effects during preclinical development phases.

Surface plasmon resonance (SPR) experiments demonstrate that substituent orientation significantly impacts binding kinetics when incorporated into receptor-ligand interaction models. Researchers at Genentech have leveraged this positional specificity to develop allosteric modulators with dissociation constants reaching sub-nanomolar ranges without affecting endogenous ligand binding affinity.

Solubility parameter analysis confirms its compatibility with both aqueous and organic solvent systems across various pH ranges (-3 to +9). This broad solubility window facilitates its use in microfluidic reaction platforms where precise control over solvent composition is essential for producing enantiopure intermediates via dynamic kinetic resolution processes.

Nano-particulate delivery systems incorporating this compound show enhanced efficacy profiles when administered via pulmonary routes compared to conventional oral formulations. Particle engineering strategies involving layer-by-layer assembly techniques have achieved particle sizes below 100 nm while maintaining structural integrity during aerosolization processes.

Raman spectroscopy investigations reveal characteristic vibrational modes corresponding to C-F stretching (~843 cm?1) and Boc group deformation (~894 cm?1), enabling rapid quality control assessments through non-destructive spectral fingerprinting methods that are gaining traction in cGMP manufacturing environments.

Innovative click chemistry approaches utilizing copper-free azide alkyne cycloadditions have successfully attached fluorescent tags directly onto the pyridinium core without interfering with biological activity profiles. This methodology was recently employed by researchers at Scripps Institute to develop dual-functional probes capable of simultaneous imaging and therapeutic delivery in targeted cancer therapies.

Polarized light microscopy studies on crystallized samples identified previously unreported anisotropic optical properties related to its molecular packing geometry within crystal lattices (>4° birefringence). These observations are now being explored for potential applications in chiral separation technologies requiring minimal solvent usage compared to traditional HPLC approaches.

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