H-DL-Met-betaNA · HCl

H-DL-Met-betaNA · HCl is a hydrochloride salt form of a DL (racemic) methionine derivative bearing a beta-naphthylamine (betaNA) substituent, providing an amino acid framework with a chiral center that is present as a mixture of enantiomers. The molecule contains a methionine side chain with a thioether sulfur, alongside an amino functionality associated with the amino acid portion and a carboxyl-derived motif that is compatible with peptide-coupling chemistry after appropriate activation or salt handling. The beta-naphthylamine moiety introduces a strongly aromatic, protonatable aniline-like group that can participate in derivatization, spectroscopic detection, and downstream conjugation strategies. The HCl salt form influences protonation state and handling during synthesis, making the compound a practical chiral-synthesis starting material or analytical/labeling intermediate where racemic input is acceptable.

1. Peptide Synthesis

H-DL-Met-betaNA · HCl supports peptide coupling workflows in synthetic organic chemistry where a methionine-based residue is required alongside an aromatic betaNA handle. The methionine backbone provides the N- and C-functional elements that can be converted into activated coupling partners, while the thioether side chain can tolerate common peptide assembly conditions and can be carried through as a stable sulfur-containing substituent. The beta-naphthylamine group can be retained as a tag for monitoring, purification, or later functional transformation, enabling peptide building block preparation for labeled analogs. Racemic stereochemistry can be used in screening libraries or method development where enantiopurity is not the controlling variable. Methionine-derived peptide intermediates prepared from amino acid salts are routinely integrated into solid-phase or solution-phase synthesis planning.

2. Chemical Biology Labeling

H-DL-Met-betaNA · HCl can be applied in chemical biology research as an amino acid-derived aromatic label for tracking methionine incorporation, receptor binding studies, or biomolecule modification strategies. The betaNA aromatic amine provides a conjugation-reactive site under appropriate activation conditions and enables spectroscopic or chromatographic readouts that distinguish labeled methionine analogs from unlabeled controls. The thioether side chain of the methionine portion functions as a chemically defined sulfur-containing motif that can be leveraged for selective oxidation-reduction schemes or for mapping sulfur tolerance in labeling workflows. The hydrochloride salt form helps manage solubility and protonation during reagent preparation, which can be relevant for reproducible labeling chemistry. Racemic use may be suitable for mechanistic assays where stereochemical resolution is not required for signal generation.

3. Peptidomimetics And SAR Studies

H-DL-Met-betaNA · HCl serves as an intermediate for peptidomimetic construction and structure-activity relationship studies that require methionine-like side-chain topology combined with an aromatic reporter group. The amino acid core enables conversion into protected or activated derivatives that can be assembled into constrained analogs, while the thioether functionality can be retained to preserve methionine-like chemical character in SAR panels. The beta-naphthylamine substituent supports generation of analog series with tunable electronic and steric properties, facilitating fragment-based comparisons of aromatic contributions to binding or permeability. DL stereochemistry can be used for early-stage SAR mapping, with later enantiomer-specific synthesis introduced when stereochemical dependence becomes evident. Amino acid derivatization strategies based on methionine scaffolds are commonly integrated into medicinal chemistry intermediate preparation.

4. Analytical Research Standards

H-DL-Met-betaNA · HCl can be utilized to prepare analytical reference materials for method development in LC-MS, HPLC, and fluorescence-oriented workflows that benefit from an aromatic betaNA moiety. The compound's defined amino acid structure, including the methionine thioether and the beta-naphthylamine group, provides characteristic ionization and retention behavior that supports identification of methionine-containing derivatives in complex mixtures. The HCl salt form can improve handling reproducibility and can be advantageous when preparing calibration standards or derivatization reagents that require consistent protonation. Racemic composition is suitable for standardization when the assay targets total labeled methionine derivative rather than enantiomer-resolved quantitation. Amino acid-based analytical intermediates like this are frequently carried into downstream method validation and impurity profiling.

5. Pharmaceutical Intermediate Preparation

H-DL-Met-betaNA · HCl can be integrated into pharmaceutical intermediate preparation where an amino acid-derived scaffold with an aromatic amine tag is used for downstream synthesis planning. The methionine backbone provides a recognizable template for conversion into protected amino acid derivatives or coupling-ready intermediates, while the thioether side chain can be used as a controlled functional element during multistep synthesis. The beta-naphthylamine functionality can support later transformations such as selective functionalization, salt formation, or incorporation into larger heteroaromatic systems depending on the synthetic route. DL stereochemistry can be acceptable for intermediate stages when stereocontrol is introduced at a later chiral induction step or when the target process tolerates racemic material. Process chemistry often benefits from amino acid ester/amide-compatible building blocks that can be carried through activation, protection, and coupling sequences with predictable functional group behavior.

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