H-Phe-NH2

H-Phe-NH2 (phenylalanine amide) is an amino acid derivative that retains the stereogenic α-carbon of L-phenylalanine while presenting a primary amide functionality at the C-terminus (-C(=O)NH2) and a free α-amino group (-NH2) at the N-terminus. The side chain is a benzyl-substituted aromatic ring that supports hydrophobic and π-interaction-driven recognition in peptide-like contexts. The molecule's two nitrogen-containing functional groups enable controlled acylation, carbamoylation, and selective protection strategies, while the amide carbonyl provides a stable linkage for further peptide coupling chemistry. As a chiral amino acid amide, H-Phe-NH2 functions as a compact, peptide-compatible intermediate for constructing C-terminal amide fragments and for studying amide-bearing phenylalanine motifs in synthetic and biochemical workflows.

1. Peptide Coupling Chemistry

H-Phe-NH2 is used in peptide synthesis workflows where a C-terminal amide terminus is required, since the terminal -C(=O)NH2 can participate as a protected or activated coupling partner depending on the chosen strategy. The free α-amino group and the amide carbonyl allow orthogonal protection planning, enabling selective formation of new peptide bonds while preserving the phenylalanine stereocenter. The benzyl side chain can be carried through coupling steps without altering its aromatic character, supporting incorporation into sequences that require hydrophobic/aromatic side-chain display. Downstream, H-Phe-NH2 can be converted into defined phenylalanine-containing peptide fragments, peptidomimetic scaffolds, and amide-terminated analogs used for structure-activity relationship studies and synthetic method development.

2. Chiral Amino Acid Intermediate

H-Phe-NH2 serves as a chiral amino acid amide intermediate for stereochemically defined building blocks in fine chemical synthesis and chiral derivatization studies. The retained stereogenic α-carbon of phenylalanine provides a stereochemical handle for downstream transformations that preserve configuration during N-acylation, N-protection, or conversion into activated derivatives. The aromatic side chain and the dual nitrogen functionality support conversion into protected amino acid derivatives, including temporary masking of the terminal amine to enable selective chemistry at the amide or α-amino site. Resulting intermediates can feed into larger peptide building block preparation, chiral library synthesis, and stereochemical mapping of phenylalanine-based fragments in applied synthetic chemistry.

3. Chemical Biology Substrates

H-Phe-NH2 is applied in chemical biology contexts as a phenylalanine amide substrate mimic for evaluating enzyme tolerance toward C-terminal amide motifs and for probing recognition elements that involve aromatic side chains. The amide linkage and free amino functionality can be leveraged to generate labeled or derivatized analogs that maintain the key phenylalanine geometry while varying terminal reactivity. Side-chain aromaticity supports interaction patterns commonly exploited in enzyme active-site binding studies and in molecular recognition assays using peptide-like substrates. Downstream derivatives prepared from H-Phe-NH2 can be used to generate assay standards, mechanistic probes, or substrate series for biochemical research focused on peptide bond formation and amide-processing chemistry.

4. Analytical Reference Standards

H-Phe-NH2 is suitable for analytical research and method validation where phenylalanine amide standards are needed to monitor derivatization efficiency, chromatographic behavior, and mass spectrometric response of amino acid amide species. The defined structure containing both an α-amino group and an amide carbonyl enables predictable derivatization routes for LC-MS or GC-based workflows, supporting consistent detection of phenylalanine-derived analytes. The chiral center can be relevant when enantioselective separation or stereospecific derivatization is part of the analytical design. Prepared reference materials derived from H-Phe-NH2 can also support impurity profiling and confirm identity in peptide intermediate characterization during synthetic and process chemistry development.

5. Pharmaceutical Intermediate Preparation

H-Phe-NH2 is used in pharmaceutical intermediate preparation as a small, peptide-compatible fragment that can be elaborated into C-terminal amide units for peptidomimetic and peptide-like drug candidates. The amide terminus and amino functionality enable controlled N-protection and subsequent coupling to activated carboxylic acid derivatives, supporting assembly of defined pharmacophore fragments with phenylalanine stereochemistry. Aromatic side-chain retention supports incorporation into scaffolds where π-interactions and hydrophobic contacts are relevant for molecular recognition. Downstream, H-Phe-NH2-derived intermediates can be routed into process chemistry sequences for producing amide-terminated building blocks and for manufacturing-scale preparation of phenylalanine-containing analogs used in medicinal chemistry programs.

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