D-Homocitrulline

D-Homocitrulline is the D-stereoisomer of a homologue of citrulline, featuring a ureido-substituted side chain that contains a stereogenic center and a terminal carboxyl group characteristic of amino acid chemistry. The molecule bears a free amino acid functionality pattern that can be selectively protected at the α-amino group and, when required, at the ureido/urea-derived functionality to control chemoselectivity during peptide coupling or derivatization. The side chain's urea-like carbonyls and adjacent nitrogens support hydrogen-bonding and can participate in acylation, carbamoylation, or controlled deprotection sequences, while the D-configuration enables stereochemically defined incorporation into chiral peptide frameworks and enzyme-binding studies. As a chiral amino acid intermediate, D-Homocitrulline can be handled as a protected amino acid derivative or converted into activated forms for downstream synthesis of ureido-containing analogs and peptide building blocks.

1. Peptide Synthesis

D-Homocitrulline is applied in peptide synthesis workflows where ureido-bearing amino acid residues are required for backbone recognition and side-chain hydrogen-bonding patterns. The α-carboxyl group and α-amino functionality allow standard peptide coupling chemistry after appropriate N-protection, while the ureido side chain can be protected to prevent undesired acylation or cross-reactivity during amide bond formation. D-configuration supports stereochemically defined incorporation into peptides, enabling preparation of D-amino acid-containing sequences for stability and controlled conformational effects. Downstream, the resulting ureido-containing peptides and peptide fragments serve as intermediates for peptidomimetic construction and as analytical targets for characterizing coupling selectivity and side-chain integrity.

2. Chemical Biology Probes

D-Homocitrulline is utilized in chemical biology research to generate chiral ureido-functional probes and amino acid analogs that can be used in binding and interaction studies. The side-chain urea/ureido motif provides multiple hydrogen-bond donors and acceptors, supporting molecular recognition when conjugated to linkers or incorporated into small-molecule scaffolds. N-/C-terminal derivatization strategies can be used to attach handles for labeling or immobilization while maintaining the D-stereochemical identity of the amino acid. The resulting labeled or modified D-homocitrulline derivatives can function as biochemical research intermediates for studying substrate specificity, receptor-ligand interactions, or enzyme-associated recognition motifs.

3. Side-Chain Functionalization

D-Homocitrulline is suitable for side-chain functionalization routes that transform the ureido functionality into protected or reactive intermediates for subsequent synthetic elaboration. The ureido nitrogens and carbonyls can be selectively protected or activated to enable controlled acylation, carbamate formation, or further conversion into constrained analogs used in structure-activity relationship studies. The α-amino acid stereocenter provides a defined chiral platform for generating stereochemically consistent derivatives, including N-protected amino acid intermediates that can be carried through multi-step synthesis. Downstream products include ureido-containing building blocks for peptidomimetics, heteroatom-rich fragments for medicinal chemistry libraries, and processable intermediates for fine chemical synthesis.

4. Unnatural Amino Acid Incorporation

D-Homocitrulline is employed in unnatural amino acid incorporation strategies where D-amino acid stereochemistry is used to tune peptide conformation and proteolytic stability profiles in synthetic constructs. The amino acid backbone supports conversion to protected forms compatible with iterative peptide assembly, while the ureido side chain can be managed through protecting-group strategies to maintain chemoselectivity across coupling and deprotection steps. D-configuration is particularly relevant for preparing stereochemically defined analogs used to interrogate stereochemical requirements in enzyme substrate recognition or binding site geometry. The resulting D-homocitrulline-containing peptides and analogs can serve as research-grade intermediates for SAR studies and for generating reference materials used in analytical method development.

5. Pharmaceutical Intermediate Preparation

D-Homocitrulline is applied as a chiral amino acid intermediate in pharmaceutical intermediate preparation where ureido-containing motifs are incorporated into drug-like scaffolds or peptide-like candidates. The presence of both an amino acid core and a ureido side chain enables stepwise protection, activation, and coupling to form amide-linked structures under controlled chemoselectivity. D-stereochemical integrity supports consistent stereochemical outcomes in downstream synthesis of stereodefined intermediates used for medicinal chemistry exploration and process chemistry development. The compound can be converted into N-protected amino acid derivatives or activated carboxylate forms to support scalable fine chemical synthesis of ureido-functional building blocks used in applied product development.

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