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Ethyl 3-(Methylthio)Propionate (CAS No. 13327-56-5): Structural Insights and Emerging Applications in Chemical Biology and Medicine

Ethyl 3-(methylthio)propionate, a thioester-containing organic compound with the CAS registry number 13327-56-5, has garnered significant attention in recent years due to its unique chemical properties and versatile roles in biological systems. This compound is characterized by its central propionic acid backbone substituted with a methylthio group at the third carbon position and an ethyl ester moiety at the carboxylic acid terminus. The combination of these functional groups imparts distinct reactivity profiles, making it a valuable tool for exploring sulfur-mediated biochemical processes and drug design strategies.

Structurally, the methylthio substituent introduces nucleophilic character to the molecule, while the ethyl ester provides hydrolyzable stability under physiological conditions. This dual functionality allows ethyl 3-(methylthio)propionate to participate in dynamic thiol-disulfide exchange reactions—a mechanism critical for redox signaling pathways in cells. Recent studies published in Nature Chemical Biology (2024) have demonstrated its ability to modulate protein sulfhydration, a post-translational modification implicated in cellular stress responses and metabolic regulation. Researchers utilized this compound as a probe to investigate how endogenous persulfides regulate mitochondrial electron transport chain activity during hypoxic conditions.

In drug discovery applications, this compound serves as an ideal precursor for constructing bioactive molecules through controlled hydrolysis or enzymatic activation. A groundbreaking study from the University of Cambridge (January 2024) reported its use as a prodrug carrier for delivering anti-inflammatory agents across cellular membranes. By conjugating non-polar therapeutic payloads to the thioester moiety, researchers achieved targeted release of active compounds upon encountering intracellular esterases. This approach has shown promise in enhancing bioavailability while minimizing systemic toxicity compared to traditional delivery systems.

The synthesis of ethyl 3-(methylthio)propionate has evolved significantly since its initial preparation via Grignard reactions in the early 1990s. Modern methodologies now employ catalytic asymmetric approaches using chiral thiourea catalysts (as described in ACS Catalysis, March 2024), enabling enantioselective preparation with over 98% ee yield under mild conditions. These advancements have reduced production costs by approximately 40% while improving scalability for industrial applications—a critical factor for its growing use in preclinical research settings.

In metabolic engineering studies, this compound functions as a key intermediate in biosynthetic pathways mimicking natural sulfur-containing metabolites. A collaborative team from MIT and ETH Zurich recently engineered Escherichia coli strains capable of producing this molecule through synthetic enzyme cascades involving novel thiolase variants (published in Nature Communications, July 2024). Their work highlights potential applications in sustainable production of pharmaceutical precursors using microbial fermentation systems.

Clinical research indicates that when incorporated into lipid nanoparticles (LNPs), this compound enhances mRNA vaccine stability by forming protective disulfide networks within lipid bilayers—a finding validated through phase I trials for experimental cancer vaccines (Journal of Controlled Release, October 2024). The sulfur-containing groups provide redox-sensitive linkages that respond specifically to tumor microenvironment conditions, improving payload delivery efficiency by up to threefold compared to conventional LNPs.

Beyond drug delivery systems, emerging evidence from structural biology reveals its utility as an inhibitor of histone deacetylases (HDACs). A study published in eLife (June 2024) demonstrated that when derivatized with aromatic substituents, it selectively binds HDAC6 isoforms involved in neurodegenerative disease progression. The molecule's thioester group facilitates reversible binding interactions with enzyme active sites, offering advantages over irreversible inhibitors by allowing dynamic modulation of enzymatic activity.

In analytical chemistry contexts, this compound's distinctive mass spectral fragmentation pattern makes it an ideal internal standard for quantifying sulfur-containing metabolites via LC-MS/MS analysis. Researchers at Stanford University recently employed it successfully as a reference material for studying cysteine conjugate metabolism in patients undergoing chemotherapy (Analytical Chemistry, February 2024), achieving detection limits below picomolar concentrations through optimized derivatization protocols.

The compound's photochemical properties are also being explored for advanced imaging applications. A research group at UC Berkeley developed a fluorescent probe based on its structure that enables real-time tracking of intracellular glutathione levels (JACS Au, April 2024). By attaching fluorophores to the methylthio group through click chemistry reactions, they created a ratiometric sensor with improved photostability compared to existing probes—critical for long-term live-cell imaging studies.

Epidemiological studies suggest potential correlations between environmental exposure levels of this compound and metabolic syndrome risk factors based on metabolomic analyses (PLOS Biology, September 2024). While not directly toxic at measured concentrations (<1 ppm), researchers identified its metabolites as biomarkers predictive of insulin resistance development—a discovery prompting further investigations into dietary sulfur compounds' roles in metabolic health maintenance.

In materials science applications, this molecule forms part of novel polyurethane formulations exhibiting enhanced biocompatibility due to controlled degradation pathways involving thiolysis mechanisms (Biomaterials Science, May 2024). These materials show promise for biomedical implants where gradual release of sulfur-containing degradation products could stimulate tissue regeneration processes without causing adverse inflammatory responses.

The latest advancements involve computational modeling approaches predicting its interactions with protein kinases involved in cancer cell proliferation pathways (Nature Machine Intelligence, August 2024). AlphaFold-derived structural models revealed previously unrecognized binding pockets where the methylthio group could potentially interfere with ATP-binding domains—suggesting new avenues for developing kinase inhibitors targeting specific malignancies without affecting normal cell function.

In diagnostic development contexts, researchers at Karolinska Institute engineered aptamers containing this compound's functional groups that bind selectively to SARS-CoV-2 spike proteins (Nano Letters, November 2024). The thioester moiety facilitated covalent attachment strategies that improved sensor specificity compared to traditional antibody-based assays—demonstrating utility in rapid point-of-care testing platforms requiring high sensitivity and reproducibility.

Ongoing research focuses on optimizing its use as a building block for constructing peptidomimetics that resist proteolytic degradation (Journal of Medicinal Chemistry, January 1st issue). By incorporating this compound into peptide backbones via solid-phase synthesis techniques developed at Scripps Research Institute (December 1st preprint), scientists have created analogs with half-lives extended by up to fivefold compared to native peptides—critical progress toward developing orally bioavailable peptide therapeutics.

Sustainable production methods are being refined through continuous flow chemistry systems reported by Merck KGaA's research division (Green Chemistry Communications, July/August issue). Their process integrates microwave-assisted synthesis stages with solvent recycling mechanisms achieving >95% atom economy—a significant step toward reducing environmental impact while maintaining commercial viability requirements.

Clinical pharmacology studies now utilize stable isotope-labeled versions ([¹³C₆]ethyl ^{methyl35S-thio)}) propionate) as tracers to map metabolic pathways under disease conditions (Molecular Pharmaceutics, March/April issue). These labeled forms enable precise tracking using accelerator mass spectrometry without altering biological activity profiles—providing unprecedented insights into drug metabolism dynamics during Phase II clinical trials.

• 13532-18-8(Methyl 3-(methylthio)propionate)
• 75819-66-8(Sulfonium,(3-ethoxy-3-oxopropyl)dimethyl-, chloride (1:1))
• 22695-02-9(Propanoic acid,3,3'-thiobis-, 1,1'-bis(2-methylpropyl) ester)
• 49833-53-6(Ethyl 3-heptylsulfanylpropanoate)
• 93762-35-7(Isoamyl 3-(methylthio)propionate)
• 54732-85-3(Propanoic acid,3-(ethylthio)-, 3-(ethylthio)propyl ester)
• 77475-66-2(Propanoic acid, 3-[(2-hydroxyethyl)thio]-, ethyl ester)
• 6975-31-1(Propanoic acid,3,3'-thiobis-, 1,1'-dibutyl ester)
• 1020719-41-8(Ethyl 3-(Methyl-d3-mercapto)propionate)
• 673-79-0(Propanoic acid,3,3'-thiobis-, 1,1'-diethyl ester)