H-beta-Chloro-D-Ala-OH · HCl

H-beta-Chloro-D-Ala-OH · HCl is a D-configured β-chloro alanine hydrochloride salt that presents an amino acid backbone with a stereogenic center at the α-position and a reactive β-chloromethyl side chain. The compound bears a free carboxylic acid under hydrochloride salt conditions, enabling standard amino acid coupling chemistry while the β-chloro substituent provides a site for nucleophilic substitution, alkylation, and subsequent functional group interconversion. The C-Cl bond and the α-amino stereochemistry make it a chiral building block for generating β-substituted alanine derivatives and for constructing peptide analogs that incorporate halogenated side chains. Salt formation improves handling and can support consistent reactivity in peptide coupling and downstream derivatization workflows where controlled amine/carboxyl chemistry is required.

1. Peptide Synthesis

H-beta-Chloro-D-Ala-OH · HCl is used in peptide building block preparation where D-alanine stereochemistry and a β-chloro side chain are required for conformational tuning and chemical handle introduction. The free carboxylic acid and amino functionality support protected amino acid synthesis workflows, including conversion to activated esters or coupling-ready derivatives compatible with amide bond formation. The β-chloromethyl group can remain intact during peptide assembly when orthogonal protection strategies are applied, enabling later side-chain transformation on the assembled peptide or peptidomimetic scaffold. Downstream, the resulting β-functionalized peptide analogs can be used for mapping structure-property relationships and for generating chemically defined peptide libraries.

2. Amino Acid Derivatization

H-beta-Chloro-D-Ala-OH · HCl serves as a chiral amino acid intermediate for β-side-chain functionalization via nucleophilic substitution at the chloromethyl position. The β-chloro substituent allows conversion to β-hydroxymethyl, β-azido, β-thioether, or β-alkylated derivatives under conditions that preserve the D-configuration at the α-center when stereochemical integrity is maintained. The carboxylic acid enables further downstream transformations such as esterification, amide formation, or incorporation into larger fragments used in fine chemical synthesis. The hydrochloride salt form supports reproducible handling during derivatization sequences aimed at producing β-substituted D-alanine building blocks for medicinal chemistry and chemical biology research.

3. Chiral Synthesis Intermediate

H-beta-Chloro-D-Ala-OH · HCl functions as a chiral amino acid intermediate for stereoselective construction of β-substituted alanine motifs used in chiral pool and stereocontrolled synthetic strategies. The α-stereocenter and the β-chloromethyl group provide a defined spatial arrangement that can be carried through multi-step syntheses to generate enantiopure derivatives for SAR studies and peptidomimetic design. The presence of both an amino acid core and a reactive halide supports modular synthesis, where the amino group can be protected for selective transformations and the side-chain chloride can be converted into diverse electrophile-derived functionalities. The resulting β-functionalized chiral intermediates can be employed as feedstocks for fragment assembly, linker construction, and stereochemically defined analog generation.

4. Chemical Biology Probes

H-beta-Chloro-D-Ala-OH · HCl can be applied in chemical biology workflows that require incorporation of a D-alanine residue bearing a chemically addressable side chain. The β-chloromethyl group provides a reactive handle for subsequent conjugation chemistries after peptide or small-molecule incorporation, enabling attachment of labels, affinity tags, or bioorthogonal precursors through controlled side-chain transformations. The amino acid core supports integration into peptide-based probes where N-/C-terminal functionalization and coupling compatibility are needed to create defined probe structures. Downstream probe derivatives can support mechanistic studies of binding interactions and labeling strategies that depend on stereochemical identity and side-chain reactivity.

5. Pharmaceutical Manufacturing Intermediates

H-beta-Chloro-D-Ala-OH · HCl is relevant to pharmaceutical intermediate preparation where halogenated amino acid derivatives are used to build chemically defined intermediates for active pharmaceutical ingredient (API) synthesis routes. The compound's amino acid functionality supports conversion to protected forms and coupling-ready intermediates used in stepwise assembly of peptidic or peptidomimetic fragments during process chemistry. The β-chloromethyl group can serve as a controlled electrophile for later substitution steps, allowing manufacturing sequences to introduce targeted side-chain functionality without changing the α-stereochemical configuration. The hydrochloride salt form can facilitate consistent material handling and can be integrated into scalable synthetic planning for fine chemical production where predictable reactivity of protected amino acid derivatives is required.

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