D-Alanine ethyl ester hydrochloride

D-Alanine ethyl ester hydrochloride is the D-stereoisomer of alanine converted into an ethyl ester and present as a hydrochloride salt, combining a chiral amino acid framework with an ester-functional C-terminus equivalent. The molecule contains a stereogenic center at the alpha carbon, a protonated amino group as the hydrochloride salt, and an ethyl ester that can be selectively transformed into amides or carboxylic acid derivatives under standard peptide and ester chemistry. Ester hydrolysis, transesterification, and amide coupling compatibility make it a practical chiral intermediate for building C-terminal fragments and for preparing further protected amino acid derivatives. The salt form improves handling and can support controlled deprotonation strategies during coupling or conversion to free amine derivatives.

1. Peptide Coupling Building Blocks

D-Alanine ethyl ester hydrochloride is used in peptide synthesis workflows where a D-alanine-derived C-terminal fragment is required for stereochemically defined coupling. The ethyl ester functions as a protected carboxyl equivalent that can be activated for conversion to amides, while the D-configuration at the alpha carbon preserves chiral integrity through downstream transformations. Protonation state control enabled by the hydrochloride salt supports preparation of coupling-ready amine forms and can be integrated into stepwise protected amino acid strategies. The resulting D-alanine-containing intermediates can be incorporated into dipeptides, peptide segments, or peptide analogs used for method development and stereochemical verification in amino acid chemistry.

2. Chiral Amino Acid Intermediate Synthesis

D-Alanine ethyl ester hydrochloride serves as a chiral amino acid intermediate for producing a range of D-alanine derivatives used in synthetic organic chemistry and process chemistry intermediate preparation. The combination of a chiral center and an ester handle facilitates conversion to carboxylic acids, activated esters, or amide-forming derivatives that retain D-stereochemistry. Salt-mediated handling can be paired with base-promoted ester hydrolysis or with ester-to-amide conversion sequences to generate downstream building blocks for fine chemical synthesis. D-alanine-based intermediates derived from this compound can feed into larger chiral molecule construction, including chiral auxiliaries, stereodefined fragments, and scaffold elaboration where stereochemical fidelity is essential.

3. Amino Acid Derivatization And Labeling

D-Alanine ethyl ester hydrochloride is applicable to amino acid derivatization strategies that require a defined D-alanine motif for analytical research and chemical biology tool development. The ester and amino functionalities enable derivatization into amide-linked probes, ester-to-acid conversion for conjugation chemistry, or incorporation into labeled analogs where the D-configuration can improve stability against enzymatic degradation. The hydrochloride salt form can be leveraged to manage amine reactivity during multi-step synthesis, supporting controlled functional group transformations prior to conjugation. Downstream derivatives produced from this intermediate can be used as reference standards, substrate analogs, or labeling precursors in studies that require stereochemically resolved amino acid structures.

4. Pharmaceutical Intermediate Preparation

D-Alanine ethyl ester hydrochloride can be employed in pharmaceutical intermediate preparation where stereodefined amino acid fragments are required for synthetic route design. The ethyl ester provides a manipulable functional group for conversion to carboxylic acid derivatives or activated intermediates that participate in amide bond formation with amine-containing partners. The D-stereochemistry can be maintained through ester activation and coupling steps, supporting the synthesis of stereochemically consistent intermediates used in medicinal chemistry and process development. The compound's functional group pattern aligns with common manufacturing intermediate preparation needs for amino acid-derived motifs that later undergo protection/deprotection or coupling in larger synthesis sequences.

5. Peptidomimetics and Nonproteinogenic Analogues

D-Alanine ethyl ester hydrochloride is suitable for constructing peptidomimetic and nonproteinogenic analogues where D-amino acid incorporation modulates conformational preferences and metabolic stability. The amino acid ester format supports transformation into coupling-ready carboxyl equivalents, enabling assembly of D-alanine-containing units within peptide-like scaffolds. The hydrochloride salt can assist in controlled handling of the amine during derivatization steps that install additional functional groups for scaffold tuning. Resulting D-alanine-derived building blocks can be integrated into peptide analog series used for structure-activity relationship studies, synthetic methodology evaluation, and stereochemical structure verification in amino acid and peptide science.

1. Cell-based adhesion assays for isolation of snake venom’s integrin antagonists

2. The effect of B-type allatostatin neuropeptides on crosstalk between the insect immune response and cold tolerance

3. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes

4. Effect of Probiotic Lactobacillus plantarum on Streptococcus mutans and Candida albicans Clinical Isolates from Children with Early Childhood Caries

5. Olfactory receptor based piezoelectric biosensors for detection of alcohols related to food safety applications