Ac-D-Tyr-OH

Ac-D-Tyr-OH is an N-acetylated D-tyrosine building block in the amino acids category, provided as the free carboxylic acid for downstream coupling chemistry. Its D-configuration and tyrosine phenolic side chain make it a useful stereochemically defined residue for peptide and peptidomimetic assembly, while the N-acetyl group provides a protected N-terminus that can be carried through as a stable segment in synthesis. Researchers commonly select this form when they need a tyrosine-containing unit with controlled stereochemistry and an N-acetylated backbone environment for structure-activity and analytical studies.

1. Peptide Segment Building

Ac-D-Tyr-OH is used as a defined tyrosine-containing segment in peptide synthesis workflows where an N-acetylated residue is required for controlled N-terminus chemistry. Peptide chemists incorporate this building block into short peptides, cyclic precursors, and peptidomimetic scaffolds to maintain the D-configuration at the tyrosine position and to ensure the residue enters the sequence with an acetylated amino terminus. This is particularly valuable in custom peptide manufacturing and medicinal chemistry programs that need stereochemically precise analogs for SAR evaluation and reference material preparation.

2. Peptidomimetic SAR Studies

Ac-D-Tyr-OH supports medicinal chemistry efforts that map the contribution of stereochemistry and N-terminal acetylation to peptide-like properties in structure-activity relationship studies. By using a D-tyrosine unit with a phenolic side chain, researchers can generate tyrosine-bearing analogs that probe how side-chain positioning and backbone acetylation influence conformational preferences and chemical behavior in assays. The N-acetylated format helps standardize the residue environment across analog series, making it useful for comparative synthesis of peptide mimics and for preparing well-defined compounds for downstream biological and physicochemical testing.

3. Analytical Reference Standards

Ac-D-Tyr-OH is frequently employed in analytical method development and LC-MS/UPLC workflows as a stereochemically defined reference component for tyrosine-containing peptide fragments and acetylated amino acid motifs. Analytical chemists use this compound to verify retention behavior, fragmentation patterns, and derivatization outcomes when monitoring synthetic intermediates or final products that include D-tyrosine and N-acetylated termini. Its free carboxylic acid and phenolic side chain provide a consistent chemical identity that is helpful for building calibration strategies and validating sample preparation steps in peptide chemistry and impurity profiling.

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