Ac-D-Phe-OMe

Ac-D-Phe-OMe is an N-acetylated, D-configured phenylalanine methyl ester that combines a protected amino terminus with an esterified carboxyl group. This structure makes the compound a stable, non-zwitterionic phenylalanine derivative commonly used as a defined building block for peptide-related synthesis and for preparing reference materials where stereochemistry and terminal protection state must be controlled. By maintaining the D-configuration at the alpha-carbon and masking both termini (acetylated N-terminus and methyl ester C-terminus), Ac-D-Phe-OMe supports downstream assembly and analytical workflows that require a precise, well-characterized amino acid unit.

1. D-Amino Acid Building Block

Ac-D-Phe-OMe is used as a stereochemically defined D-phenylalanine unit in peptide synthesis development and in the preparation of short peptide analogs where incorporation of D-amino acids is required for studying sequence effects, proteolytic stability trends in model systems, or conformational behavior of peptide scaffolds. Researchers in peptide chemistry and chemical biology rely on the N-acetyl and methyl ester termini to keep the molecule in a controlled reactivity state during segment assembly and to reduce variability associated with free termini. The phenyl side chain provides a direct match to the widely used phenylalanine motif, making it a practical reference building block for designing D-Phe-containing analogs and for comparing outcomes against L-phenylalanine derivatives.

2. Peptide Fragment Standards

Ac-D-Phe-OMe is frequently selected as a reference compound for analytical method development and quality control in workflows that track peptide fragments, terminally protected amino acid residues, or stereochemical composition by chromatographic and mass spectrometric techniques. Because the compound is terminally capped (N-acetyl) and carboxyl-esterified (methyl ester), it offers a consistent mass and fragmentation pattern that can be used to validate retention behavior and detector response for D-phenylalanine-containing intermediates and partially assembled sequences. Analytical chemists and peptide manufacturing R&D teams use such standards to support method transfer, troubleshooting of coupling/cleavage steps, and verification of stereochemical integrity in intermediate characterization.

3. Pharmaceutical Intermediate Development

Ac-D-Phe-OMe is applied in medicinal chemistry and pharmaceutical intermediate development as a well-defined D-phenylalanine derivative for preparing downstream protected intermediates and for generating defined stereochemical inputs into larger synthetic sequences. The acetylated amino group and methyl ester carboxyl group allow chemists to carry the D-Phe motif through intermediate transformations while maintaining terminal protection that can be advantageous for controlling chemoselectivity and minimizing side reactions from free amine or carboxyl functions. Process development teams use this type of amino acid derivative when the stereochemical identity and terminal protection state of the phenylalanine fragment must be preserved across multi-step synthesis leading to D-amino acid-containing peptide-like structures.

4. Stereochemistry-Controlled Derivatization

Ac-D-Phe-OMe is used in chemical biology and analytical chemistry contexts where stereochemistry-controlled derivatization or derivatized-residue handling is required, such as preparing defined substrates for studying D-amino acid incorporation patterns in synthetic libraries or generating calibration materials for stereochemical assignments. The D-configuration and capped termini reduce ambiguity from interconversion or terminal reactivity, enabling reproducible preparation of derivatives that retain the original stereochemical signature. Laboratories engaged in peptide library construction and stereochemical validation workflows value Ac-D-Phe-OMe as a consistent starting material for generating D-phenylalanine-containing reference derivatives.

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