Fmoc-D-Bpa-OH

Fmoc-D-Bpa-OH is an Fmoc-protected D-configuration amino acid derivative featuring a benzyl-protected phenylalanine-like backbone (D stereochemistry at the α-carbon) and a side chain bearing a benzyl-protected phenylalanine analog functionality that can be unmasked or transformed during peptide and chemical synthesis. The molecule combines an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group with a free carboxylic acid, enabling controlled participation in stepwise peptide coupling while minimizing side reactions from the amine during assembly. The aromatic side chain and the stereodefined α-center support stereochemically consistent incorporation into peptide sequences and subsequent side-chain derivatization or functional-group interconversions. The protected amine and acid handle also make it suitable as a chiral building block and downstream intermediate for peptidomimetic construction and structure-guided chemical modification.

1. Peptide Synthesis

Fmoc-D-Bpa-OH is used in solid-phase peptide synthesis workflows where the Fmoc group enables orthogonal N-protection and base-labile deprotection to generate a reactive amino terminus for peptide coupling. The D-configured α-stereocenter and the side-chain aromatic motif provide stereochemical fidelity for constructing D-amino-acid-containing peptides that resist proteolytic cleavage and can be used to probe sequence-dependent structure. The free carboxylic acid supports standard amide bond formation with activated carboxyl derivatives, allowing incorporation as a single residue or as part of longer peptide building blocks. The resulting D-amino-acid peptides can then be used for peptide science, chemical biology probes, and method development in amino acid derivative peptide coupling chemistry.

2. Chemical Biology Probes

Fmoc-D-Bpa-OH is applied in chemical biology research to generate D-amino-acid-containing peptide probes that maintain defined stereochemistry for studying molecular recognition and binding-site geometry. The combination of an Fmoc-protected amine and a functionalizable aromatic side chain supports downstream transformations after peptide assembly, including side-chain modification strategies that can tune polarity, aromatic interactions, or conjugation handles. The D stereochemistry at the backbone can be leveraged to modulate conformational preferences and to separate stereospecific effects from general aromatic contributions in binding studies. Peptide products derived from this chiral building block can serve as tools for target engagement mapping, receptor-ligand interaction studies, and mechanistic evaluation of amino acid side-chain effects.

3. Peptidomimetics And SAR

Fmoc-D-Bpa-OH is suitable for peptidomimetic construction and structure-activity relationship studies where controlled incorporation of D-amino-acid residues helps explore how stereochemistry influences potency-relevant physicochemical properties. The protected amino acid format supports systematic substitution into peptide-like scaffolds, while the aromatic side-chain functionality can be used to maintain or vary hydrophobic and π-interaction patterns across analog series. The free carboxylic acid and Fmoc-protected nitrogen enable iterative synthesis of analogs that can be further derivatized to adjust solubility, stability, or conformational constraints. Downstream analog libraries derived from this chiral amino acid intermediate can be applied in medicinal chemistry research to refine molecular design hypotheses and to support SAR-driven optimization of peptide-based leads.

4. Bioconjugation Handles

Fmoc-D-Bpa-OH is employed in bioconjugation chemistry when peptide or peptidomimetic scaffolds require defined stereochemical placement of aromatic residues that can participate in linker installation or post-assembly functionalization. The Fmoc-protected amine allows clean peptide assembly with minimal side reactions, while the aromatic side chain can be leveraged as a chemical platform for subsequent derivatization steps that introduce conjugation-ready groups. The D configuration can help control spatial orientation within the conjugate, supporting reproducible presentation of functional motifs to biomolecular targets. Conjugates prepared from this protected D-amino-acid building block can be used for labeling strategies, affinity reagent construction, and analytical reagent generation in biochemical research settings.

5. Pharmaceutical Intermediate Preparation

Fmoc-D-Bpa-OH is relevant to pharmaceutical manufacturing and process chemistry contexts as a chiral, protected amino acid intermediate that can be incorporated into peptide-like active ingredients, peptide intermediates, or processable precursor blocks. The Fmoc protection strategy supports controlled N-functionalization during multi-step synthesis, and the free carboxylic acid enables conversion into activated intermediates for amide coupling under manufacturing-compatible conditions. The stereodefined D-amino-acid center supports consistent impurity profiles and reproducible stereochemical outcomes across scale-up routes where racemization control is important. Downstream use can include preparation of protected peptide fragments, peptidomimetic intermediates, and specialty chemical building blocks that feed into larger synthetic sequences for industrial fine chemical production.

6. Analytical Standards Development

Fmoc-D-Bpa-OH is suitable for analytical research as a stereochemically defined amino acid derivative standard and reference material for method development in peptide analysis. The combination of Fmoc protection and a free carboxylic acid provides a characteristic chemical signature that can be exploited for LC-MS or derivatization-based workflows when monitoring protected amino acid incorporation, deprotection progress, or peptide fragment identity. The D stereochemistry enables discrimination between enantiomeric or diastereomeric amino acid residues in analytical comparisons, supporting stereochemical verification during peptide building block synthesis. Reference materials derived from Fmoc-D-Bpa-OH can be used to calibrate analytical methods, validate peptide coupling performance, and support quality-focused characterization of amino acid derivative intermediates.

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