H-DL-Phe-OMe · HCl is a protected amino acid ester salt derived from DL-phenylalanine, featuring a benzyl side chain (phenylmethyl) and an esterified carboxyl group as the methyl ester (Phe-OMe) while existing as a hydrochloride salt. The molecule contains an amino group in protonated form (as indicated by the HCl salt) and an amine-carboxyl ester framework that distinguishes it from free amino acids and from fully protected peptide-building blocks. In synthesis and analytical workflows, this amino acid ester salt is employed as a precursor for preparing phenylalanine-containing peptide derivatives and for constructing more complex amino acid structures under conditions where the methyl ester and salt form help define chemoselectivity and handling.
H-DL-Phe-OMe · HCl is a hydrochloride salt of the methyl ester of phenylalanine, where the amino group is present as an N-acetylated (H-DL-) protected functionality and the stereochemical content is racemic (DL) at the α-carbon. The structure combines a benzyl side chain for hydrophobic and π-interaction chemistry with an ester carbonyl that can participate in acyl transfer chemistry and downstream conversion to amides or acids. The salt form improves handling of the amino ester and supports compatibility with standard peptide and amino acid derivative workflows, while the N-protected amine reduces undesired side reactions during coupling or derivatization steps. The compound therefore functions as a chiral-precursor-type amino acid ester intermediate in synthetic organic chemistry and peptide-building-block preparation, with reactivity governed by ester hydrolysis/transesterification and amide-forming transformations after appropriate activation.
1. Peptide Coupling Chemistry
H-DL-Phe-OMe · HCl is applied in peptide coupling workflows as an amino acid ester intermediate that can be converted into activated carboxylic acid derivatives for amide bond formation. The phenylalanine side chain provides a stable aromatic handle that maintains stereochemical integrity during standard coupling sequences, while the ester functionality enables controlled conversion to carboxylate equivalents through hydrolysis or transesterification strategies. The N-acetylated character (H-DL- designation) supports chemoselective processing by suppressing free amine reactivity when building protected peptide fragments. Downstream use includes incorporation into peptide-like sequences, synthesis of short peptidomimetic scaffolds, and preparation of intermediates used to evaluate coupling chemistry in synthetic methodology studies.
2. Protected Amino Acid Ester Synthesis
H-DL-Phe-OMe · HCl is suitable for protected amino acid chemistry and intermediate preparation where amino acid ester handling is required for stepwise functional group control. The methyl ester form supports esterification-compatible transformations and can be routed toward carboxylic acid regeneration for subsequent peptide coupling or for making orthogonally protected derivatives. The racemic (DL) stereochemical composition can serve as a practical feedstock for process development, library synthesis, or when stereochemical resolution occurs at a later stage in the synthetic route. The hydrochloride salt form can facilitate consistent reagent dosing and minimize amine salt variability during manufacturing-oriented intermediate preparation.
3. Peptidomimetic Building Blocks
H-DL-Phe-OMe · HCl functions in peptidomimetic construction by supplying a phenylalanine-derived aromatic unit that can be incorporated into constrained analogs after conversion of the ester into amide or carboxylate functionality. The ester carbonyl can be transformed into acylating groups to generate peptide bond surrogates, while the N-protected amino functionality supports sequential derivatization without uncontrolled polymerization or side-chain acylation. The benzyl aromatic side chain enables hydrophobic packing and can be used to tune conformational preferences in synthetic analogs designed for biochemical binding studies. Downstream derivatives may include non-natural peptide analog fragments, structure-activity relationship (SAR) probe scaffolds, and intermediate materials for medicinal chemistry-style library synthesis.
4. Chemical Biology Labeling Precursors
H-DL-Phe-OMe · HCl can be employed as a precursor in chemical biology research where phenylalanine motifs are incorporated into labeled or modified biomolecule analogs. The amino acid ester provides a controllable platform for generating carboxylate or activated acyl species that can be coupled to amine-bearing targets, including linkers used to attach tags or affinity handles. The aromatic side chain can participate in noncovalent recognition modes, supporting design of probes that rely on hydrophobic and π-interaction patterns. Conversion of the ester into coupling-ready functional groups enables downstream formation of labeled conjugates used for assay development, molecular recognition studies, and analytical method validation.
5. Process Chemistry Intermediate Preparation
H-DL-Phe-OMe · HCl is relevant to process chemistry intermediate preparation for fine chemical manufacturing, where stable amino acid ester forms streamline multi-step synthesis planning. The hydrochloride salt and ester format can support robust handling in batch or semi-batch operations, while the N-protected amino functionality reduces side reactions that would otherwise complicate purification after each transformation. The compound's conversion pathways to acids, amides, or activated derivatives align with common industrial routes for amino acid-derived intermediates used in peptide manufacturing and specialty chemical production. Downstream utility includes supplying feedstock for subsequent protected amino acid synthesis steps, enabling scalable construction of peptide fragments and related functional molecules used across research and industrial workflows.
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