H-DL-Ala-OEt · HCl is a hydrochloride salt of the ethyl ester of alanine in a DL (racemic) mixture, featuring an α-amino acid backbone with a methyl side chain characteristic of alanine. The molecule bears an ethyl ester at the carboxyl terminus and an amino group that is present as the hydrochloride salt, which changes its protonation state and solubility relative to the free amino acid. As an amino acid ester hydrochloride intermediate, it is commonly employed in peptide synthesis and related derivatization workflows where the esterified carboxyl group and protected amino functionality support controlled conversion into more complex alanine-containing derivatives.
H-DL-Ala-OEt · HCl is a hydrochloride salt of the alanine ethyl ester, where the amino acid backbone is present as an esterified carboxyl group and the amino functionality is present as a protonated amine salt. The DL designation indicates a racemic mixture at the alanine stereocenter, enabling stereochemical reactivity in synthetic routes where enantiopure material is not required. The ethyl ester form participates in acylation and peptide coupling chemistry after appropriate activation or conversion to more stable intermediates, while the HCl salt provides convenient handling and controlled nucleophilicity during derivatization. The compound's small, aliphatic side chain and protected carboxyl functionality make it a practical chiral precursor or general amino acid ester intermediate for downstream transformations in peptide and fine-chemical synthesis.
1. Peptide Coupling Chemistry
H-DL-Ala-OEt · HCl is applied in peptide coupling chemistry as an alanine-based amino acid ester that can be converted into activated coupling partners or transformed into protected amino acid derivatives compatible with standard peptide assembly strategies. The presence of the esterified carboxyl group and protonated amine supports controlled functional group manipulation, including ester-to-amide conversion after activation and subsequent N-protection planning. Racemic stereochemistry can be used when the target scaffold tolerates stereochemical mixtures or when the ester serves as a temporary handle in synthetic sequences. Downstream use can include preparation of alanine-containing peptide fragments, peptidomimetic precursors, and intermediate building blocks for library synthesis.
2. Chiral Building Block Preparation
H-DL-Ala-OEt · HCl functions as a chiral amino acid intermediate precursor in routes that either resolve enantiomers later or generate stereodefined derivatives through stereoselective downstream steps. The alanine stereocenter and ester functionality enable conversion to more elaborated chiral building blocks, including N-protected alanine derivatives and side-chain functionalization intermediates. Hydrochloride salt formation improves handling during protection/deprotection planning and can facilitate formation of derivatives that preserve stereochemical information during subsequent coupling steps. Resulting materials can feed into stereochemical studies, racemate-to-enantiomer workflows, and stereocontrolled peptide analog synthesis where alanine is used as a structural reference unit.
3. Pharmaceutical Intermediate Synthesis
H-DL-Ala-OEt · HCl is utilized in pharmaceutical intermediate synthesis as an amino acid ester feedstock for constructing amide-linked motifs and for generating small-molecule scaffolds containing alanine-derived fragments. The ester group provides a handle for controlled functional group interconversion, such as conversion to carboxylic acid, amide formation, or incorporation into heteroatom-containing linkers after activation. Protonated amine behavior under acidic conditions supports predictable derivatization planning, including N-protection strategies that align with downstream coupling chemistry. Industrially relevant downstream derivatives can include alanine-based prodrug-like intermediates, solubilizing side-chain fragments, and process-friendly building blocks for fine chemical manufacturing.
4. Process Chemistry Intermediate
H-DL-Ala-OEt · HCl serves as a process chemistry intermediate for manufacturing routes that require a stable, small amino acid ester with straightforward functional group transformation pathways. The compact aliphatic structure and ethyl ester format support batch-to-batch reproducibility in synthetic sequences where carboxyl functionality must be temporarily masked and later unmasked or converted to an amide. Hydrochloride salt handling can simplify storage and dosing in chemical manufacturing settings by maintaining the amine in a defined protonation state during derivatization. Downstream utility includes preparation of protected amino acid derivatives, peptide coupling-ready intermediates, and intermediate streams for specialty chemical production where alanine ester chemistry is integrated into larger synthetic operations.
5. Analytical Reference Standards
H-DL-Ala-OEt · HCl is applicable in analytical research as an alanine ester reference material for method development and characterization of amino acid derivatives in chromatographic and mass spectrometric workflows. The combination of an amino acid backbone, ethyl ester functionality, and HCl salt form yields predictable ionization behavior and enables tracking of ester hydrolysis, derivatization efficiency, and conversion to carboxylic acid or amide forms. Racemic composition can be advantageous when analytical methods are designed to quantify total alanine ester content independent of enantiomeric separation. Resulting analytical standards support quality control of peptide building block preparation, monitoring of intermediate transformations, and verification of identity for alanine-derived synthetic intermediates.
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