Chemical Identity and Structure

Methyl 3-(benzylamino)butanoate (CAS registry should be confirmed via SDS; see review flags) belongs to the class of beta-amino esters, compounds in which an amino group is located at the beta-carbon relative to the ester carbonyl. The molecule comprises a methyl ester group, a secondary amine bearing a benzyl (phenylmethyl) protecting/activating group, and a methyl-substituted chiral center at the 3-position.

Its molecular formula is C₁₂H₁₇NO₂ with a molecular weight of approximately 207.27 g/mol. The benzyl group on the nitrogen simultaneously activates the amine toward alkylation reactions and serves as a removable protecting group that can be cleaved by catalytic hydrogenolysis (e.g., Pd/C, H₂) to reveal the free secondary or primary amine, a feature widely exploited in multi-step synthesis.

The presence of the stereogenic center at C-3 means the compound can exist as (R)- and (S)-enantiomers. Researchers should confirm the stereochemical specification of the batch received from the certificate of analysis (CoA) supplied by Aladdin Scientific.

Synthesis and Role as a Building Block

Beta-amino esters such as Methyl 3-(benzylamino)butanoate are commonly prepared by reductive amination of the corresponding beta-keto ester (methyl 3-oxobutanoate, i.e., methyl acetoacetate) with benzylamine, typically using a reducing agent such as sodium cyanoborohydride or sodium triacetoxyborohydride in an appropriate protic or aprotic solvent. Asymmetric variants employing chiral catalysts or pre-formed chiral auxiliaries can afford enantioenriched product.

As a synthetic building block, this compound offers two orthogonal handles for further elaboration:

• The ester group can be hydrolyzed to the carboxylic acid, reduced to the alcohol, or converted to amides and other acyl derivatives.
• The secondary amine can be alkylated, acylated, or subjected to reductive amination, enabling rapid diversification of the nitrogen substituents.

These characteristics make it particularly useful in the construction of gamma-lactams, 1,3-amino alcohols (after reduction), and peptide-like structures relevant to medicinal chemistry campaigns.

Research Applications

Methyl 3-(benzylamino)butanoate finds application across several research domains:

1. Medicinal Chemistry: The compound serves as a precursor to beta-amino acid derivatives, which are incorporated into peptidomimetics and protease inhibitors. The N-benzyl group can be retained for pharmacological studies or removed to generate free amines for further SAR exploration.
2. Asymmetric Synthesis: Enantiomerically enriched forms are valuable starting materials for the preparation of chiral amine pharmaceuticals and agrochemicals, leveraging the stereogenic center at C-3.
3. Heterocyclic Synthesis: Intramolecular cyclization of the amine onto the ester (or the derived acid) affords gamma-lactam (pyrrolidinone) scaffolds important in drug discovery.
4. Polymer and Materials Research: Beta-amino esters are explored as monomers or cross-linkers in biodegradable polymer systems, though specific utility of this particular compound in such contexts should be verified against primary literature.

Researchers in total synthesis, fragment-based drug discovery, and combinatorial chemistry will find M692081 a practical reagent for diversifying amine-containing compound libraries.

Handling, Safety, and Storage

As with all laboratory chemicals, appropriate personal protective equipment (PPE) must be used when handling Methyl 3-(benzylamino)butanoate. Standard precautions include:

• Use of chemical-resistant gloves, safety goggles, and a laboratory coat.
• Handling in a well-ventilated fume hood to avoid inhalation of vapors or aerosols.
• Avoiding contact with skin and eyes; in the event of contact, wash with copious water and seek medical attention if irritation persists.

Storage should be in a tightly sealed container in a cool, dry, and well-ventilated area, away from strong oxidizing agents and strong acids. The compound should be kept away from heat sources and open flames.

Note: Researchers must consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific for M692081 for complete hazard classification, GHS pictograms, first-aid measures, disposal procedures, and regulatory information prior to use. The SDS supersedes any general handling guidance provided in this article.