H-D-3Pal-OH*2HCl

H-D-3Pal-OH*2HCl is a D-configured 3-palmitylalanine amino acid derivative supplied as a dihydrochloride salt, featuring a chiral amino acid backbone with a primary amine converted to a hydrochloride-protected form and a free carboxylic acid for controlled coupling chemistry. The side chain contains a long, saturated C16 alkyl group that strongly influences hydrophobicity, conformational preferences, and solubility behavior in peptide and biomolecule contexts. Salt formation with two equivalents of HCl stabilizes the amine for handling while enabling predictable deprotection and reactivity during peptide coupling or derivatization workflows. The combination of stereochemical definition at the alpha carbon and a chemically inert alkyl side chain makes the compound a practical chiral amino acid intermediate for hydrophobic residue incorporation and downstream synthetic transformations.

1. Peptide Synthesis

H-D-3Pal-OH*2HCl is used in peptide building workflows where a protected or salt-stabilized amino functionality must be converted into a coupling-ready amine while retaining the carboxylic acid for amide bond formation. The D-stereocenter provides stereochemical control for unnatural amino acid incorporation, and the long alkyl side chain can be introduced as a hydrophobic segment to tune folding, aggregation propensity, and membrane affinity of peptide analogs. The dihydrochloride format supports reproducible handling and can be integrated into standard peptide coupling strategies after appropriate base-mediated salt neutralization and activation of the acid. The resulting peptide products serve as research-grade substrates for structure-activity relationship studies and as intermediates toward amphiphilic or lipid-mimetic peptide scaffolds in synthetic peptide chemistry.

2. Side-Chain Functionalization

H-D-3Pal-OH*2HCl supports amino acid derivatization programs that exploit the free carboxylic acid for esterification, amidation, or conversion to activated intermediates while keeping the alkyl side chain available for hydrophobic patterning. The D-configuration can be retained through carboxyl activation steps, enabling stereochemically defined analog libraries where only the side-chain presentation or terminal functionality changes. The hydrochloride salt form can be managed to control chemoselectivity during sequential transformations, such as forming mixed anhydrides or coupling to amines for downstream conjugation handles. Hydrophobic 3-palmitylalanine derivatives derived from this intermediate can be used to generate amphiphile-like building blocks, lipidated peptide fragments, or hydrophobic spacers for biomolecule modification and materials-oriented molecular design.

3. Drug Discovery Chemistry

H-D-3Pal-OH*2HCl is applicable to medicinal chemistry and drug discovery programs focused on peptidomimetic construction and hydrophobic residue placement in lead optimization. The long-chain alkyl side chain and defined D-alpha stereochemistry enable incorporation of a membrane-interacting or hydrophobic anchor within peptide-like scaffolds without introducing additional reactive heteroatoms that could complicate SAR interpretation. Carboxylic acid functionality can be transformed into amide, ester, or activated acid derivatives to connect to pharmacophore fragments, linkers, or receptor-binding motifs. The compound therefore functions as a chiral amino acid intermediate for generating structure-activity relationship analogs where hydrophobicity, conformational bias, and proteolysis resistance can be probed through controlled amino acid substitution.

4. Bioconjugation Chemistry

H-D-3Pal-OH*2HCl can be employed in bioconjugation workflows that require hydrophobic amino acid-derived linkers for attaching peptide or protein fragments to biomolecular targets. The amino acid backbone provides a defined stereocenter for consistent conjugate structure, while the carboxylic acid enables formation of stable amide linkages to amine-bearing biomolecules or to bifunctional crosslinkers. The dihydrochloride salt form supports controlled amine availability during conjugation planning, and the inert alkyl side chain can drive partitioning toward hydrophobic microenvironments such as membrane-associated domains or hydrophobic pockets. Downstream conjugates prepared from this intermediate can serve as chemical biology reagents for studying biomolecular interactions, improving probe localization, or generating labeled peptide constructs for analytical and mechanistic investigations.

5. Pharmaceutical Intermediate Preparation

H-D-3Pal-OH*2HCl is suitable for process chemistry intermediate preparation where a chiral, salt-stabilized amino acid derivative is needed as a feedstock for downstream protected amino acid chemistry and peptide-manufacturing routes. The presence of both a carboxylic acid and a protonated amine allows conversion into activated acid derivatives or coupling-ready forms under controlled neutralization and activation conditions, supporting scalable synthesis of larger peptide intermediates. The D-configuration helps maintain stereochemical integrity through multi-step manufacturing sequences that incorporate unnatural amino acids into peptide drug candidates or peptide-like intermediates. The long alkyl side chain can be leveraged to produce hydrophobic peptide segments used in industrial fine chemical synthesis, where consistent residue identity and predictable reactivity are required for reliable downstream assembly.

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