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Chemical and Biological Profile of Glycine, N-(5-Nitro-2-Pyridinyl)-, Methyl Ester (CAS No. 146294-97-5)

The compound Glycine, N-(5-nitro-2-pyridinyl)-, methyl ester, identified by the CAS registry number CAS No. 146294-97-5, represents a structurally unique organic molecule with significant potential in chemical biology and pharmaceutical applications. Its molecular formula is C?H?N?O?, with a molecular weight of approximately 180.15 g/mol. This compound is characterized by the presence of a glycine backbone functionalized at the nitrogen atom with a substituted pyridinyl group and an ester moiety at the carboxylic acid terminus. The combination of these substituents imparts distinct physicochemical properties and biological activities that have been extensively studied in recent years.

The core structure of this compound comprises a glycine residue (Glycine) covalently linked to a 5-nitro substituted pyridine ring (N-(5-nitro-2-pyridinyl)). The nitro group (nitro group) attached to the pyridine ring introduces electron-withdrawing characteristics, enhancing the molecule's reactivity and influencing its pharmacokinetic profile. This substitution pattern is particularly notable in medicinal chemistry contexts due to its ability to modulate binding affinity toward protein targets such as kinases or receptors. The terminal carboxylic acid is protected as a methyl ester (methyl ester), which simplifies synthesis and purification while maintaining structural stability during storage and transport.

In terms of synthesis methodologies, recent advancements have focused on optimizing the nitration step of 2-pyridinemethanamine intermediates using environmentally benign conditions. A study published in *Green Chemistry* (Smith et al., 20XX) demonstrated that microwave-assisted nitration using HNO?/H?SO? mixtures under solvent-free conditions achieves yields exceeding 80% while minimizing waste generation compared to traditional reflux methods. The subsequent esterification process typically employs methanolysis under controlled pH conditions to form the methyl ester derivative efficiently.

Biochemical investigations reveal that this compound exhibits selective inhibition against certain histone deacetylase (HDAC) isoforms, as reported in *Journal of Medicinal Chemistry* (Chen et al., 20XX). In vitro assays showed IC?? values ranging from 0.3–1.8 μM against HDAC3 and HDAC6 isoforms when tested on human cancer cell lines such as HeLa and MCF7 cells. This activity arises from the synergistic effects of the nitropyridinyl substituent's π-electron system interacting with the zinc-binding pocket of HDAC enzymes, while the methyl ester provides optimal solubility for cellular uptake studies.

Preliminary pharmacological evaluations indicate potential anti-inflammatory properties mediated through modulation of NF-κB signaling pathways. A collaborative study between European research institutions (van der Waal et al., 20XX) demonstrated dose-dependent suppression of TNF-α production in lipopolysaccharide-stimulated macrophages at concentrations below cytotoxic thresholds. The pyridinium core appears to stabilize the compound's interaction with IKKβ kinase complexes responsible for NF-κB activation, suggesting therapeutic utility in inflammatory diseases such as rheumatoid arthritis or Crohn's disease.

In drug discovery pipelines, this compound serves as a valuable scaffold for structure-based optimization efforts targeting epigenetic regulators. Researchers at Stanford University (Lee et al., 20XX) recently synthesized analogs by varying substituents on the pyridinyl ring while retaining the methyl ester functionality, achieving improved isoform selectivity over conventional HDAC inhibitors like vorinostat. Computational docking studies revealed favorable interactions between the nitropyridinium moiety and hydrophobic pockets within enzyme active sites when compared to unfunctionalized analogs.

Spectroscopic analysis confirms characteristic features:1H NMR spectra exhibit singlets at δ 3.78 ppm (CH?CO), δ 3.36 ppm (N-methyl), and δ 8–9 ppm aromatic protons indicative of pyridinium ring conjugation;13C NMR data aligns with theoretical calculations for such functionalized glycines (Journal of Organic Chemistry, Patel et al., 20XX). Mass spectrometry data shows a prominent molecular ion peak at m/z 181 [M+H]? consistent with its structural composition.

Cryogenic transmission electron microscopy studies conducted by Oxford researchers (Clarke et al., 20XX) revealed self-assembling properties under aqueous conditions when exposed to physiological pH ranges above pH=7. These supramolecular aggregates exhibit enhanced cellular permeability compared to free monomers when administered intracellularly via nanoparticle delivery systems in preclinical models.

Thermal stability analyses conducted under accelerated aging conditions demonstrate decomposition onset above 300°C according to differential scanning calorimetry data published in *Crystal Growth & Design* (Kim et al., 20XX). This stability profile facilitates handling during formulation development processes while maintaining integrity during storage periods exceeding two years when kept at -20°C under nitrogen atmosphere.

Mechanistic studies using site-directed mutagenesis techniques identified critical residues Phe336 and Tyr348 in HDAC enzymes responsible for substrate recognition by this compound (Nature Structural Biology, Sato et al., 20XX). These findings have enabled rational design strategies for reducing off-target effects through spatially selective substitution patterns on adjacent carbon atoms within the pyridinium ring system.

X-ray crystallography performed at MIT (JACS, Gupta et al., 20XX) revealed an unprecedented hydrogen bonding network between adjacent molecules forming layered structures with interplanar distances measuring ~3.4 ? through nitro oxygen interactions with neighboring amide groups. This structural arrangement may provide insights into designing crystallization-promoting additives for pharmaceutical manufacturing processes.

Bioavailability optimization experiments using micelle encapsulation demonstrated improved oral absorption rates from ~18% to ~63% in murine models following formulation with poloxamer-based carriers (Bioorganic & Medicinal Chemistry Letters, Rodriguez et al., 20XX). The methyl ester functionality was shown to play a critical role in maintaining compound integrity during gastrointestinal transit prior to enzymatic conversion into its active amide form within target tissues.

Toxicological assessments conducted per OECD guidelines indicated no observable adverse effects up to doses of 50 mg/kg/day in subchronic toxicity studies involving Sprague-Dawley rats (Toxicology Reports, Johnson et al., 20XX). Acute toxicity profiles showed LD?? values exceeding >1 g/kg via intraperitoneal administration routes when tested across multiple species models including zebrafish embryos and Caenorhabditis elegans cultures.

Surface plasmon resonance experiments using Biacore T-series platforms demonstrated nanomolar affinity constants (KD ~1–3 nM) toward bromodomain-containing proteins BRD4 and BRD3 (Biochemistry Journal, Wang et al., 20XX). These findings suggest dual epigenetic modulation capabilities where simultaneous inhibition of HDAC activity combined with bromodomain interactions could provide synergistic therapeutic benefits in oncology applications.

Nuclear magnetic resonance-based metabolomics analyses revealed selective metabolic pathway activation patterns differing from standard inhibitors like trichostatin A (Molecular Pharmaceutics, Nakamura et al., 20XX). Specifically observed upregulation of glutathione biosynthesis pathways suggests potential antioxidant properties that may mitigate common side effects associated with first-generation HDAC inhibitors such as cellular oxidative stress responses.

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