H-L-Asp(Bzl)-NH2*HCl

H-L-Asp(Bzl)-NH2·HCl is an L-aspartamide hydrochloride in which the side-chain carboxyl of L-aspartic acid is protected as a benzyl ester (Asp(Bzl)) while the α-amino acid functionality is presented as the carboxamide (amino acid amide) at the C-terminus. The molecule contains a stereogenic α-carbon characteristic of L-aspartate derivatives, an amide-forming amino group that is present as a salt (HCl) for improved handling and controlled nucleophilicity, and a benzyl-protected side-chain ester that can be selectively removed by hydrogenolysis to regenerate the free side-chain carboxylic acid. The presence of both an amide and a protected acidic side chain creates a defined reactivity profile for peptide coupling chemistry, while the salt form supports aqueous compatibility during derivatization planning. Asp(Bzl) also functions as a chiral, side-chain-protected intermediate suitable for downstream conversion into aspartyl building blocks, aspartate-containing peptides, and carboxylate-bearing analogs used in biochemical and process-oriented synthesis.

1. Peptide Coupling Building Block

H-L-Asp(Bzl)-NH2·HCl is applied in peptide synthesis workflows where an aspartamide-type amino acid derivative is required as a coupling partner or fragment precursor. The protected side-chain benzyl ester controls the aspartate carboxyl reactivity during amide bond formation, while the α-amino functionality (present as the hydrochloride salt) supports controlled activation and nucleophilic participation in peptide coupling strategies. The L-configuration at the α-carbon provides stereochemical fidelity for constructing aspartate-containing sequences and for preparing peptide analogs with defined backbone geometry. Deprotection of the benzyl ester can be used downstream to furnish free side-chain carboxylates for further derivatization or for final peptide assembly.

2. Side-Chain Functionalization Chemistry

H-L-Asp(Bzl)-NH2·HCl serves as a side-chain functionalization intermediate in synthetic organic chemistry and chemical biology reagent preparation. The benzyl-protected side-chain carboxyl group allows orthogonal manipulation relative to the amide functionality, enabling selective transformations that preserve the peptide-compatible core until the desired stage. Benzyl ester removal can regenerate the aspartate carboxylate for subsequent esterification, amidation, or conjugation chemistry, supporting the construction of carboxyl-bearing motifs used in molecular recognition and biomolecule modification. The hydrochloride salt form can also aid in handling during derivatization planning, supporting reproducible downstream conversion to functional aspartate derivatives.

3. Unnatural Amino Acid Incorporation

H-L-Asp(Bzl)-NH2·HCl is suitable for unnatural amino acid incorporation and peptidomimetic construction where controlled presentation of an aspartate side chain is required. The protected benzyl ester provides a protected acidic side chain that can be carried through coupling steps without competing with backbone amide formation, while the L-stereocenter maintains defined stereochemistry for structure-function studies. The amide-bearing amino acid derivative format can be adapted as a building block in sequence design, enabling generation of peptide analogs with altered terminal functionality or constrained aspartate environments. Downstream deprotection yields an aspartate carboxyl group that can be used to tune charge, hydrogen-bonding patterns, and conjugation handles in synthetic scaffolds.

4. Chemical Biology Conjugation Reagents

H-L-Asp(Bzl)-NH2·HCl can be employed in chemical biology for preparing carboxylate-functional conjugation intermediates and labeling reagents. The benzyl-protected side-chain carboxyl group acts as a masked handle that can be unveiled when a defined conjugation stage is reached, supporting orthogonal coupling to electrophiles or activated carboxyl-reactive partners. The presence of the amide and the L-aspartate stereochemical framework helps maintain a recognizable amino acid motif for incorporation into larger biomolecule-modifying constructs. The resulting free aspartate functionality after deprotection can serve as a site for attachment to carriers, linkers, or assay scaffolds, enabling controlled generation of labeled or functionalized biomolecule analogs.

5. Process Chemistry Intermediate Preparation

H-L-Asp(Bzl)-NH2·HCl is relevant to process chemistry intermediate preparation for manufacturing routes that require a stable, isolable aspartate derivative with orthogonal protection. The benzyl ester protection strategy supports stepwise synthesis by suppressing side-chain carboxyl reactivity during earlier transformations, while the hydrochloride salt form can improve handling characteristics and reproducibility in controlled manufacturing settings. The defined stereochemistry of the L-aspartamide derivative helps reduce variability in downstream peptide building block preparation and supports consistent coupling behavior across batches. Benzyl ester deprotection provides a predictable conversion to free side-chain carboxylates, enabling downstream formation of aspartate-containing intermediates used in fine chemical synthesis and specialty peptide-related production.

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