H-D-Dap(Boc)-OMe · HCl

H-D-Dap(Boc)-OMe · HCl is a chiral lysine-family amino acid derivative in which the side chain corresponds to 2,3-diaminopropyl functionality (D-configuration at the α-carbon) and the α-amino group is protected as a Boc carbamate. The molecule is present as the hydrochloride salt, which increases handling stability and enables salt-compatible coupling workflows, while the methyl ester (OMe) at the carboxyl terminus provides a protected C-terminus for peptide building block preparation. The Boc group provides orthogonal protection for amide bond formation, and the free or derivatizable side-chain amino functionality supports subsequent functional group transformations and orthogonally protected peptide analog synthesis. The combination of stereodefined α-carbon, Boc-protected α-amine, and ester-protected carboxyl group makes this compound a practical chiral intermediate for downstream deprotection, peptide coupling, and controlled side-chain elaboration in amino acid chemistry and peptide science.

1. Protected Amino Acids

H-D-Dap(Boc)-OMe · HCl supports protected amino acid synthesis workflows where Boc protection on the α-amine and methyl ester protection on the carboxyl group enable stepwise assembly of peptide fragments. The hydrochloride salt form can facilitate reproducible handling and can be employed to manage amine protonation states during coupling and deprotection sequences. Side-chain amino functionality enables selective derivatization strategies that can be coordinated with Boc removal to expose the α-amine at the appropriate stage. Downstream processing can convert the methyl ester into activated carboxylates for peptide coupling, aligning with protected amino acid chemistry used for controlled N- and C-terminal modification.

2. Peptide Synthesis

H-D-Dap(Boc)-OMe · HCl is suitable for peptide synthesis as a stereodefined, protected amino acid building block designed for incorporation into peptide chains. The Boc-protected α-amine suppresses undesired side reactions during amide bond formation, while the methyl ester provides a protected C-terminus that can be transformed into coupling-ready carboxyl derivatives. The D-configuration at the α-carbon enables stereochemical control in peptide construction, supporting the preparation of D-amino acid-containing peptides and analogs for conformational and proteolytic stability studies. Side-chain amino groups can be retained for further functionalization or protected in subsequent steps to tune solubility, charge density, and coupling selectivity in longer peptide sequences.

3. Chemical Biology Labeling

H-D-Dap(Boc)-OMe · HCl can be applied in chemical biology and biomolecule labeling strategies where amino acid side-chain amines serve as reactive handles for conjugation. The protected α-amine and ester functionality help isolate the reactive chemistry to the intended stage, allowing side-chain derivatization while maintaining compatibility with peptide or linker assembly. Salt formation supports controlled reactivity of the amine groups during derivatization planning, which can be coordinated with deprotection to generate defined conjugation-ready intermediates. The resulting labeled amino acid derivatives or peptide conjugates can be used to probe molecular recognition, track biomolecular localization, or construct affinity reagents that rely on stereodefined amino acid incorporation.

4. Peptidomimetics And SAR

H-D-Dap(Boc)-OMe · HCl enables peptidomimetic construction and structure-activity relationship studies by providing a D-configured amino acid unit with side-chain amine functionality for charge and geometry tuning. Boc protection and ester protection support systematic modification of termini and side-chain groups, allowing synthesis of analog series where stereochemistry and functional group placement are varied in a controlled manner. The presence of amino-reactive sites supports formation of amide, urea, or salt-stabilized linkages in scaffold elaboration, which can be integrated into iterative SAR workflows. Downstream derivatives prepared from this chiral intermediate can be used to build combinatorial libraries of peptide-like structures that explore how D-amino acid incorporation and side-chain substitution patterns affect molecular properties.

5. Pharmaceutical Intermediate Preparation

H-D-Dap(Boc)-OMe · HCl is applicable to pharmaceutical intermediate preparation in fine chemical synthesis contexts requiring stereochemically defined amino acid derivatives. The Boc-protected α-amine and methyl ester provide protection-group logic that can be mapped onto manufacturing-friendly sequences for controlled deprotection, activation, and coupling to form protected peptide intermediates. Hydrochloride salt handling supports consistent material transfer and can help manage amine protonation during downstream transformations that generate activated carboxylates or coupling partners. Side-chain amine functionality can be leveraged for subsequent derivatization steps that yield cationic or amine-functional intermediates relevant to peptidic drug substance synthesis and related process chemistry intermediate streams.

6. Process Chemistry Intermediate

H-D-Dap(Boc)-OMe · HCl can serve as a process chemistry intermediate for industrial-scale amino acid derivative manufacturing where orthogonal protection enables predictable unit operations. The Boc carbamate and methyl ester provide stable, isolable protection states that can be converted into coupling-ready forms under controlled conditions, supporting scalable peptide building block preparation. D-stereochemical integrity supports manufacturing of stereodefined intermediates used in peptide analog and peptidomimetic production pipelines. Side-chain amine functionality supports downstream functional group transformation into protected or derivatized forms, enabling consistent intermediate generation for specialty chemical production and applied amino acid chemistry.

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