Erythro-D-β-Hydroxynorleucine

Erythro-D-β-Hydroxynorleucine is a D-configured β-hydroxy amino acid featuring a straight-chain norleucine backbone with a stereogenic center at the β-carbon bearing a hydroxyl substituent, yielding an erythro relationship between the amino and β-hydroxy functionalities. The molecule contains a primary amino group and a carboxylic acid (or, depending on the supplied form, a corresponding protected/derivatized variant), enabling standard amino acid coupling chemistry while introducing a secondary alcohol that can participate in hydrogen bonding, oxidation/reduction, and orthogonal protection-deprotection strategies. The β-hydroxyl group can be converted into activated intermediates for side-chain functionalization or retained as a handle for downstream stereodefined transformations, including formation of ethers, esters, or carbonyl derivatives. As a chiral amino acid building block, it is commonly handled as a protected amino acid derivative during peptide synthesis or as a chiral synthetic intermediate for constructing β-functionalized peptidomimetics and structure-defined biochemical probes.

1. Peptide Synthesis

Erythro-D-β-Hydroxynorleucine supports peptide building block preparation for solid-phase and solution-phase assembly where β-hydroxyl functionality influences local conformation and hydrogen-bonding patterns. The amino acid backbone enables standard amide bond formation after appropriate N-protection and carboxyl activation, while the erythro-configured β-alcohol can be protected orthogonally (e.g., as an ether or ester) to survive coupling conditions and then be selectively revealed. The stereochemical integrity at the β-center is maintained through careful protection-group selection and coupling conditions, allowing incorporation into peptides that require defined β-hydroxy stereochemistry. Downstream, the resulting β-hydroxy-containing peptides can be used as substrates, reference standards, or scaffold elements for studying how hydroxyl-bearing side chains modulate peptide stability and molecular recognition.

2. Peptidomimetics And SAR Studies

Erythro-D-β-Hydroxynorleucine is suitable for peptidomimetic construction and structure-activity relationship studies where a β-hydroxy side chain serves as a stereodefined polar motif. The D-configuration and erythro relationship provide a controlled spatial arrangement of the hydroxyl relative to the amide backbone, enabling rational design of analogs that probe hydrogen-bonding networks and conformational preferences. The β-alcohol can be derivatized into protected forms for iterative synthetic elaboration, or converted into carbonyl-containing analogs to generate series for SAR mapping without losing the chiral framework. The amino acid derivative thus functions as a chiral fragment for generating β-functionalized libraries and for comparing structure-defined analogs in biochemical assays and binding studies.

3. Chemical Biology Probes

Erythro-D-β-Hydroxynorleucine can be employed in chemical biology research to generate hydroxyl-bearing peptide analogs used for probing biomolecular interactions and enzyme recognition. The β-hydroxyl group provides a chemically addressable handle for conjugation strategies, including transformation into activated ester/ether intermediates or selective functional group interconversions that preserve stereochemistry. The amino acid framework supports incorporation into tagged peptides or recognition elements, enabling downstream attachment of reporters such as fluorophores, affinity handles, or isotopically labeled moieties through orthogonal protection and controlled deprotection. The resulting labeled or modified constructs can be used as mechanistic probes, reference standards, or competition reagents to interrogate substrate specificity and binding determinants tied to β-hydroxy stereochemistry.

4. Protected Amino Acid Derivatives

Erythro-D-β-Hydroxynorleucine is commonly translated into protected amino acid derivative formats that align with peptide coupling and orthogonal deprotection workflows. The presence of both an amino functionality and a β-secondary alcohol enables systematic protection-group selection, where N-protection supports amide bond formation and alcohol protection can be tuned to withstand coupling and subsequent synthetic steps. The erythro stereochemistry at the β-carbon provides a stable chiral element that remains traceable through protection, activation, and deprotection sequences, supporting reproducible construction of stereodefined intermediates. The protected amino acid derivative form can serve as a process-ready intermediate for manufacturing peptide analogs, enabling consistent downstream synthesis of β-hydroxy-containing products for research and specialty chemical production.

5. Process Chemistry Intermediate

Erythro-D-β-Hydroxynorleucine can function as a chiral amino acid intermediate in process chemistry routes that require β-functionalization with stereochemical control. The β-hydroxyl group enables conversion into protected or activated derivatives that can be carried through multi-step syntheses, supporting manufacturing workflows for chiral building blocks used in fine chemical synthesis. The D-configuration and defined erythro relationship reduce ambiguity in downstream stereochemical outcomes when the intermediate is incorporated into larger molecules via peptide coupling or amide-forming transformations. The compound's functional-group complement supports scalable intermediate preparation for β-hydroxy peptide analogs, chiral fragments for peptidomimetics, and stereodefined precursors used in industrial chemical manufacturing of research-grade materials.

6. Analytical Research Standards

Erythro-D-β-Hydroxynorleucine is suitable for analytical research as a stereochemically defined standard and reference intermediate for method development involving amino acid and peptide analysis. The β-hydroxy functionality provides distinct chromatographic and spectroscopic behavior relative to non-hydroxylated analogs, supporting identification and quantification in workflows such as amino acid profiling, peptide hydrolysate characterization, and chiral separation method validation. The D-erythro stereochemical definition allows unambiguous assignment of peaks or signals when comparing β-hydroxy-containing peptides, metabolites, or synthetic intermediates. The compound can therefore serve as a calibration material and structural reference for analytical characterization of β-hydroxy amino acid derivatives and their peptide-derived products.

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