What Is 3-aminopropanoic acid ethyl ester

Overview

3-Aminopropanoic acid ethyl ester, also known as ethyl 3-aminopropanoate, is an organic compound classified as an amino ester. It features an ethyl ester group attached to the carboxylic acid end of 3-aminopropanoic acid, making it a derivative of beta-alanine. This compound is widely used in medicinal chemistry and organic synthesis due to its functional versatility.

As a building block in pharmaceutical development, it enables the creation of more complex molecules, including bioactive peptides and enzyme inhibitors. Its structure allows for selective chemical modifications, enhancing its utility in drug discovery and specialty chemical manufacturing.

• Chemical formula: The compound has the molecular formula C5H11NO2, indicating five carbon atoms, eleven hydrogen atoms, one nitrogen, and two oxygen atoms.
• CAS Number: It is cataloged under CAS Registry Number 5330-73-0, used globally to identify this specific chemical.
• Molecular weight: The compound has a molar mass of 117.15 g/mol, influencing solubility and reactivity in reactions.
• Physical state: At room temperature, it typically appears as a white to off-white crystalline solid, often hygroscopic.
• Solubility: It is soluble in polar solvents like ethanol and water, with moderate solubility in acetone and methanol.

How It Works

This compound functions as a key intermediate in synthetic pathways, particularly those involving beta-amino acid derivatives. Its amine and ester groups allow for sequential reactions, enabling chemists to build complex structures step by step.

• Nucleophilicity: The primary amine group acts as a nucleophile, readily reacting with electrophiles such as acyl chlorides or aldehydes in condensation reactions.
• Ester hydrolysis: Under basic conditions, the ethyl ester group can be hydrolyzed to yield 3-aminopropanoic acid, a beta-amino acid analog.
• Protecting groups: The amine is often protected with Boc (tert-butyloxycarbonyl) to prevent side reactions during multi-step syntheses.
• Peptide coupling: It can be incorporated into peptide chains using reagents like HATU or DCC, forming amide bonds with carboxylic acids.
• Reductive amination: When reacted with aldehydes and a reducing agent like NaBH3CN, it forms N-substituted derivatives useful in drug scaffolds.
• Ring formation: It participates in cyclization reactions to form azetidinones or lactams, important structures in antibiotic design.

Comparison at a Glance

Below is a comparison of 3-aminopropanoic acid ethyl ester with structurally or functionally related compounds:

The table highlights how 3-aminopropanoic acid ethyl ester differs in structure and application from similar molecules. While beta-alanine is used in supplements, this ester derivative is tailored for laboratory synthesis. Its higher molecular weight and ester functionality make it more reactive in organic transformations than its parent acid.

Why It Matters

Understanding the role of 3-aminopropanoic acid ethyl ester is essential for advancing pharmaceutical and agrochemical research. Its adaptability in synthesis makes it a valuable asset in developing new therapeutic agents and functional materials.

• Drug development: It is used in synthesizing anticonvulsant and antimicrobial agents, where beta-amino acid motifs enhance bioavailability.
• Peptidomimetics: Serves as a scaffold for non-natural peptide analogs that resist enzymatic degradation in the body.
• Chiral synthesis: Can be resolved into enantiomers for use in asymmetric synthesis of bioactive molecules.
• Material science: Incorporated into polymer backbones to modify mechanical and thermal properties of new materials.
• Research availability: Commercially available from Sigma-Aldrich, TCI, and Alfa Aesar, facilitating academic and industrial access.
• Regulatory status: Not classified as hazardous under GHS, but requires standard lab handling due to potential irritant properties.

Its growing application in medicinal chemistry underscores its importance in modern science. As researchers continue to explore novel drug candidates, compounds like this remain indispensable in the synthetic toolkit.