Methyl 2-amino-3,3,3-trifluoropropanoate

This compound is typically obtained as a colorless to pale yellow liquid or low-melting solid. Its molecular formula is C4H6F3NO2, corresponding to a molecular weight of 157.09. The boiling point is approximately 140–145°C at atmospheric pressure, with a calculated density near 1.36 g/cm³. It is soluble in common organic solvents including methanol, dichloromethane, and ethyl acetate, moderately soluble in water due to the polar amino and ester groups, and sparingly soluble in aliphatic hydrocarbons. The molecule features an amino acid ester core with a trifluoromethyl group at the 2-position, creating a quaternary carbon center. The primary amine is susceptible to acylation and alkylation reactions, while the ester can undergo hydrolysis under acidic or basic conditions. The trifluoromethyl group is strongly electron-withdrawing and metabolically stable. Storage in tightly sealed containers under inert atmosphere at reduced temperature is recommended. Contact with strong oxidizing agents, strong acids, and strong bases should be avoided.

Methyl 2-amino-3,3,3-trifluoropropanoate is a fluorinated α-amino acid ester in which the side chain is replaced by a trifluoromethyl group. The molecule combines a primary amine, a methyl ester, and a trifluoromethyl substituent on a compact three-carbon backbone, creating a quaternary carbon center at the α-position. The trifluoromethyl group introduces strong electron-withdrawing character through inductive effects, which significantly influences both the basicity of the amine and the reactivity of the ester. This fluorinated amino acid ester serves as a building block for introducing fluorinated motifs into peptides and pharmaceuticals, where the CF3 group can enhance metabolic stability, lipophilicity, and binding affinity through electronic effects. The primary amine provides a handle for peptide coupling, enabling incorporation into larger peptide chains, while the ester can be hydrolyzed to the corresponding carboxylic acid for further functionalization. This combination of a masked carboxylic acid, a modifiable amine, and a fluorinated alkyl group makes the compound valuable in medicinal chemistry and peptide science for constructing fluorinated analogs of biologically active molecules.

Building Block for Fluorinated Peptides
This trifluoromethyl amino acid ester is employed in the synthesis of fluorinated peptide analogs with enhanced metabolic stability and improved pharmacokinetic properties. Incorporation of trifluoromethyl-substituted amino acids into peptide chains can protect against proteolytic degradation while maintaining or enhancing biological activity. The ester group enables standard peptide coupling protocols, allowing the introduction of this non-natural amino acid into peptide sequences at specific positions to modulate conformation and receptor interactions.

Pharmaceutical Intermediate
In drug discovery, this compound serves as a building block for synthesizing enzyme inhibitors and receptor modulators containing the 2-amino-3,3,3-trifluoropropanoate motif. The trifluoromethyl group can act as a bioisostere for methyl or other substituents, often improving metabolic stability and binding affinity through enhanced lipophilic interactions. The amino group enables amide coupling with carboxylic acid-containing pharmacophores, while the ester provides a handle for further functionalization through hydrolysis to the carboxylic acid or reduction to the corresponding alcohol.

Precursor for Fluorinated Heterocycles
The amino ester functionality can participate in cyclocondensation reactions to form fluorinated heterocyclic systems such as imidazoles, oxazoles, and pyrazines. The trifluoromethyl group imparts unique electronic properties to these heterocycles, which are investigated for their potential as kinase inhibitors, antifungal agents, and other bioactive compounds. The compact structure and defined stereochemistry enable predictable cyclization outcomes.

Organic Synthesis Building Block
As a versatile synthetic intermediate, methyl 2-amino-3,3,3-trifluoropropanoate participates in diverse transformations including N-acylation, N-alkylation, and peptide coupling reactions. The ester can be hydrolyzed to the corresponding amino acid for use in peptide synthesis or reduced to the amino alcohol for further functionalization. The trifluoromethyl group can serve as a reporter for 19F NMR studies in biological systems, enabling monitoring of peptide conformation and interactions. Its utility extends to the synthesis of fluorinated analogs of natural products and drug candidates where the introduction of fluorine can modulate biological activity and pharmacokinetic properties.