What Is Ethyl 3-Amino-3-(pyridin-3-yl)propanoate Dihydrochloride?

Ethyl 3-amino-3-(pyridin-3-yl)propanoate dihydrochloride is a beta-amino acid ester derivative in which the ethyl ester of a beta-amino propionic acid backbone carries a pyridin-3-yl (nicotinic) group at the alpha-carbon relative to the amino group (the 3-position of the propanoate chain). It is provided as the dihydrochloride salt to confer improved crystallinity, stability, and ease of handling compared with the free base form.

Structurally, the molecule combines three pharmacophoric elements relevant to drug discovery: a free primary amine (as its protonated HCl salt), an ethyl ester as a masked carboxylic acid or electrophilic handle, and a pyridine ring that can participate in hydrogen bonding and engage with biological targets. These features make it a valuable bifunctional building block in the construction of more complex molecules.

Research Applications and Synthetic Utility

This compound is widely used as an intermediate in medicinal chemistry and pharmaceutical research. The beta-amino ester scaffold is a key structural motif in peptidomimetics, where it can mimic natural beta-amino acids found in bioactive peptides. Researchers exploit it to incorporate pyridine-containing beta-amino acid units into peptide chains, potentially modulating binding affinity and metabolic stability.

In asymmetric synthesis, the chiral center at C-3 (bearing both the amino and pyridyl groups) makes the compound relevant to the preparation of enantiomerically enriched building blocks. Although the racemic form is typically supplied, resolution techniques or asymmetric methods can yield single enantiomers for structure-activity relationship studies.

The ethyl ester functionality can be hydrolyzed to the corresponding beta-amino acid, reduced to an amino alcohol, or used in amide coupling reactions, extending the synthetic versatility of this scaffold significantly. The pyridine nitrogen also offers an additional coordination site, which is exploited in the design of metal-chelating pharmacophores and in catalyst design.

Handling, Safety, and Storage Guidelines

As a dihydrochloride salt, this compound is generally more stable to air and moisture than its free base counterpart; however, standard laboratory precautions apply. Researchers should handle the compound wearing appropriate personal protective equipment (PPE) including gloves, laboratory coat, and eye protection, and work in a well-ventilated area or fume hood.

For storage, keep the reagent in a tightly sealed container in a cool, dry, and dark location. Specific recommended temperature ranges (e.g., room temperature, 2–8 °C, or −20 °C) should be confirmed by consulting the Aladdin product datasheet or the certificate of analysis (CoA) supplied with each lot, as conditions may vary with formulation. Avoid repeated freeze-thaw cycles if stored frozen.

For solution preparation, the dihydrochloride salt is generally soluble in water and polar protic solvents such as methanol and ethanol. Solubility in aprotic solvents (e.g., DMF, DMSO) is typically adequate for synthetic use; exact solubility data should be verified experimentally or from the product datasheet. Consult the Safety Data Sheet (SDS) for full hazard classification and first-aid measures before use.

Quality, Purity, and Documentation

Aladdin Scientific supplies Ethyl 3-amino-3-(pyridin-3-yl)propanoate dihydrochloride (SKU: E191049) with a certificate of analysis (CoA) for each lot. The CoA typically includes identity confirmation (e.g., by NMR or HPLC), purity determination, and physical characterization data. Researchers requiring specific purity grades or custom quantities are encouraged to contact Aladdin's technical support team.

Purity is commonly assessed by HPLC and reported as area percentage. For sensitive applications such as asymmetric catalysis or biological assays, verifying enantiomeric excess (ee) may also be warranted if a chiral product is desired. Lot-specific data are available upon request and are essential for reproducibility in published research.

Structural identity is typically confirmed by proton NMR, which reveals characteristic signals for the pyridine ring protons, the methine proton at C-3, the methylene protons, the ester ethyl group, and the NH signals (in appropriate deuterated solvents). Mass spectrometry data provide additional confirmation of molecular weight.