H-alpha-Me-D-Phe(4-Br)-OH

H-alpha-Me-D-Phe(4-Br)-OH is a stereodefined, D-configured phenylalanine derivative bearing an alpha-methyl substituent and a para-bromo substituent on the aromatic ring. The molecule contains a free carboxylic acid and a secondary alpha-carbon stereocenter that is constrained by the H-alpha-Me substitution, while the aromatic C4-Br functionality provides a chemically addressable handle for cross-coupling and electrophilic aromatic transformations. The combination of D-configuration and alpha-alkylation influences conformational preferences and peptide backbone geometry, making it suitable for stereochemically controlled incorporation into peptide chains or for constructing chiral amino acid intermediates. The aryl bromide also enables downstream functional group diversification without disturbing the amino acid acid functionality used for peptide coupling chemistry.

1. Peptide Synthesis

H-alpha-Me-D-Phe(4-Br)-OH supports peptide building-block workflows where carboxyl activation and amide bond formation are required, with the free carboxylic acid serving as the coupling partner after appropriate protection of the acid or conversion to an activated ester. The D-configuration and alpha-methyl substitution can be leveraged to tune backbone sterics and resistance to proteolysis when incorporated as a single residue into protected amino acid sequences. The para-bromo group can remain intact through coupling steps and later participate in post-assembly diversification, enabling a two-stage strategy of peptide construction followed by aromatic functionalization. Resulting peptide analogs can be prepared for library synthesis, SAR studies, and mechanistic investigations in peptide chemistry and chemical biology.

2. Side-Chain Functionalization

H-alpha-Me-D-Phe(4-Br)-OH is well suited to side-chain functionalization programs because the aryl bromide at the 4-position functions as a reliable electrophile for Pd-catalyzed cross-coupling chemistry. The aromatic ring can be converted into substituted phenyl motifs via Suzuki, Sonogashira, or Buchwald-Hartwig-type transformations, allowing systematic variation of electronic and steric properties while retaining the amino acid scaffold. The alpha-methyl and D-stereocenter provide a stereochemically defined chiral environment that can be carried through subsequent derivatization and used to generate chiral intermediates for peptidomimetics. Downstream products can serve as diversified amino acid derivatives or as aromatic reporters and binding-site modulators within synthetic organic chemistry and applied molecular design.

3. Chiral Amino Acid Intermediate

H-alpha-Me-D-Phe(4-Br)-OH functions as a chiral amino acid intermediate for stereocontrolled synthesis of alpha-methylated D-phenylalanine analogs and related chiral building blocks. The presence of both a stereogenic alpha-carbon and a functionalizable para-bromo aryl group enables orthogonal synthetic planning, where protecting-group strategies can focus on the carboxylic acid and any required amine protection during subsequent transformations. The free acid can be converted into protected forms compatible with peptide coupling, while the aryl bromide can be deferred for later diversification to maintain synthetic flexibility in multi-step routes. This makes the compound applicable to fine chemical synthesis and process chemistry intermediate preparation where stereochemical integrity and downstream cross-coupling compatibility are required.

4. Peptidomimetics And SAR

H-alpha-Me-D-Phe(4-Br)-OH is applicable to peptidomimetic and SAR studies because alpha-methylation and D-configuration introduce defined stereochemical constraints that can alter conformational sampling in peptide-like scaffolds. The para-bromo substituent provides a handle for generating analog series with systematically varied aromatic substituents, supporting structure-activity relationship exploration based on electronic effects and steric tuning. The amino acid acid functionality supports conversion into protected derivatives for incorporation into oligomers, while the aryl bromide enables late-stage diversification that can minimize changes to the core scaffold. Resulting analog sets can be produced for biochemical research intermediate generation and for mapping binding-site requirements in molecular design programs.

5. Pharmaceutical Manufacturing Intermediates

H-alpha-Me-D-Phe(4-Br)-OH can be employed in pharmaceutical intermediate supply chains where stereodefined amino acid derivatives are required for the synthesis of non-natural peptide components and peptidomimetic fragments. The free carboxylic acid enables controlled conversion into protected amino acid forms for coupling chemistry, while the aryl bromide supports manufacturing-compatible diversification steps that can be scheduled after key assembly operations. The D-stereochemistry and alpha-methyl substitution support consistent building-block identity across batches, which is relevant for reproducible synthesis of chiral intermediates and downstream molecular entities. The compound therefore aligns with process chemistry intermediate preparation and specialty chemical production workflows that depend on robust functional group compatibility.

6. Chemical Biology Labeling

H-alpha-Me-D-Phe(4-Br)-OH is suitable for chemical biology labeling and biomolecule modification strategies where an aromatic electrophile can be transformed into functional groups for conjugation or detection. The para-bromo group can be converted into substituted aromatic motifs that may incorporate linkers or reactive handles, while the alpha-methylated D-amino acid backbone supports incorporation into peptide probes with defined stereochemistry. The free carboxylic acid enables conversion to protected derivatives for peptide coupling, supporting the preparation of labeled analogs that can be used as research reagents in molecular interaction studies. Downstream derivatization can generate probe scaffolds for analytical research and biomolecule modification, leveraging the orthogonality between peptide assembly and aromatic functionalization.

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