H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O is a D-configuration, α-methylated phenylalanine ethyl ester hydrochloride hydrate, functioning as a chiral amino acid ester intermediate with a stereogenic center at the α-position. The structure contains a protected carboxyl functionality as an ethyl ester, a phenyl side chain bearing a para-trifluoromethyl substituent that modulates hydrophobicity and electronic character, and an α-methyl group that increases steric differentiation during peptide coupling or derivatization. The presence of HCl and water indicates formation of a salt form, which can improve handling of the amino ester while influencing amine reactivity and coupling conditions. The combination of D-stereochemistry, ester functionality, and electron-withdrawing CF3 substituent makes the compound suitable for incorporation into stereodefined peptide fragments and for downstream conversion into protected amino acid derivatives, peptidomimetic scaffolds, and analytical standards.

1. Peptide Synthesis

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O supports peptide building workflows where a D-α-methyl phenylalanine residue is required to control backbone conformation and proteolytic stability in peptide analogs. The amino ester framework enables conversion to an amine-protected or activated coupling partner, while the α-methyl group and D-configuration provide stereochemical fidelity during amide bond formation. The para-CF3 aromatic side chain can be retained through coupling and used to tune lipophilicity and aromatic packing in peptide sequences. Downstream processing can include ester hydrolysis or transesterification to generate carboxyl-reactive derivatives for stepwise peptide construction, including solid-phase or solution-phase fragment assembly.

2. Chiral Building Blocks

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O is a chiral amino acid ester intermediate designed for stereoselective synthesis routes that require a defined D-configuration at the α-carbon. The α-methyl substituent creates a sterically differentiated stereocenter that can influence coupling selectivity and subsequent functional group transformations, while the CF3-substituted aromatic ring provides a chemically robust handle for medicinal chemistry-style scaffold elaboration. Salt formation with HCl and hydration can affect solubility and practical handling, enabling controlled preparation of reactive derivatives such as protected amines or carboxyl-activated species. The compound can be employed as a stereochemically encoded precursor for unnatural amino acid incorporation, chiral fragment generation, and structure-directed library synthesis.

3. Side-Chain Functionalization

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O can be applied to side-chain and backbone functionalization strategies where an electron-withdrawing CF3 aromatic substituent is used to modulate reactivity and molecular recognition. The ester functionality allows staged chemistry: ester hydrolysis to the corresponding carboxylic acid, selective protection for peptide compatibility, or conversion to activated intermediates for further coupling. The α-methylated D-amino acid backbone can be leveraged to introduce conformational constraints in peptidomimetics, while the para-CF3 group can serve as a stable substituent during multi-step synthesis and as a tracer-like motif for analytical differentiation. Resulting derivatives may include C-terminal modified amino acid units, aromatic-functional peptidomimetic fragments, and intermediates for building larger stereodefined molecular architectures.

4. SAR Studies

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O is suitable for structure-activity relationship studies that require systematic variation of stereochemistry, backbone substitution, and aromatic electronics in peptide-like chemotypes. The D-configuration and α-methyl substitution enable direct comparison of backbone stereochemical effects on conformation and binding-site complementarity, while the CF3 substituent provides a controllable change in hydrophobic and inductive effects across analog series. The amino ester form supports conversion into standardized coupling-ready units, enabling parallel synthesis of analogs with consistent stereochemical identity. Downstream use can include preparation of peptide fragments for screening workflows, generation of SAR-focused reference compounds, and production of stereochemically defined intermediates for iterative medicinal chemistry campaigns.

5. Analytical Standards

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O can function as an analytical reference material for method development and identity confirmation in amino acid and peptide analysis. The defined D-stereochemistry, α-methyl substitution, and para-CF3 aromatic group create a distinctive mass and fragmentation signature that can support LC-MS or GC-MS method qualification and impurity profiling during protected amino acid synthesis. The ester and salt hydrate features allow preparation of consistent analytical forms, including conversion to the free amino acid or protected derivatives to match assay requirements. Generated derivatives can also be used as calibration or retention references for monitoring peptide coupling intermediates, verifying stereochemical integrity, and supporting quality control in fine chemical synthesis and peptide building block production.

6. Pharmaceutical Manufacturing

H-alpha-Me-D-Phe(4-CF3)-OEt*HCl*H2O aligns with pharmaceutical manufacturing and process chemistry needs where stereochemically defined amino acid building blocks are required for controlled peptide intermediate generation. The amino ester and salt form can be integrated into manufacturing routes that include protection/deprotection sequences and conversion to activated carboxyl derivatives for reproducible peptide coupling steps. The CF3-substituted aromatic side chain provides a chemically stable motif that can be carried through manufacturing operations to yield consistent intermediate profiles for downstream drug substance-related synthesis. Resulting downstream materials may include protected amino acid derivatives, C-terminal or N-terminal modified peptide fragments, and process intermediates suitable for scale-up of stereodefined peptidomimetic or peptide-like compounds.

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