H-D-Pro-NHEt · HCl is a protected amino acid derivative based on proline, featuring a proline core bearing an N-ethylamide (NHEt) functionality and an additional hydrochloride counterion. The molecule contains a secondary amide (from the N-ethylamide), a free carboxyl group present as the hydrochloride salt form, and a stereochemically defined proline ring system with the N-substitution pattern fixed by the NHEt group. H-D-Pro-NHEt · HCl is used as a building block for peptide and amide bond construction in solution-phase or solid-phase synthesis, where the amide-protected nitrogen and salt-stabilized carboxyl group help control chemoselectivity during stepwise coupling.
H-D-Pro-NHEt · HCl is a hydrochloride salt of an N-ethylamide-protected D-proline derivative, featuring a D-configured pyrrolidine stereocenter and an amide functionality (Pro-NH-CH2CH3) that modulates polarity and coupling behavior. The carboxyl group is present as a free carboxylic acid (H-D-Pro-) or acid-associated functionality under hydrochloride salt conditions, enabling controlled conversion into peptide-compatible activation states. The rigid proline ring and secondary amide geometry support stereochemically defined peptide bond formation, while the D-configuration enables access to D-amino acid-containing scaffolds used in conformationally constrained peptide analogs. Acid salt formation improves handling of the amino acid derivative and can influence solubility and downstream deprotection or neutralization steps during peptide synthesis and derivatization workflows.
1. Peptide Synthesis
H-D-Pro-NHEt · HCl is used in peptide building workflows where D-proline incorporation is required to tune backbone conformation and protease resistance profiles in peptide synthesis. The proline ring provides a conformationally restricted secondary amine environment, while the N-ethyl amide maintains the nitrogen in a non-primary state that can be compatible with specific coupling strategies after appropriate activation of the carboxylic acid. The hydrochloride counterion supports reproducible handling as a chiral amino acid derivative and can be neutralized to match standard peptide coupling conditions. Downstream, H-D-Pro-NHEt · HCl can serve as a stereodefined intermediate for constructing D-amino acid peptides and peptidomimetic sequences for structure-activity relationship studies and biochemical probing.
2. Peptidomimetics And SAR
H-D-Pro-NHEt · HCl supports peptidomimetic and SAR-oriented chemistry by providing a D-configured, conformationally constrained proline unit that can be installed into analog libraries. The stereochemistry at the D-amino acid center and the cyclic proline backbone influence turn formation and local rigidity, enabling systematic variation of stereochemical motifs in bioactive peptide-like scaffolds. The carboxylic acid functionality allows conversion into activated derivatives for sequential assembly, while the N-ethyl amide can be retained or transformed depending on the desired final amide pattern. The resulting D-proline-containing constructs can be used to generate analog sets for SAR studies, conformational mapping, and receptor-binding or enzyme-interaction investigations using nonclinical biochemical assays.
3. Chiral Building Block Development
H-D-Pro-NHEt · HCl functions as a chiral amino acid intermediate for stereoselective synthesis routes that require D-proline-derived fragments. The D-configuration and rigid pyrrolidine scaffold provide a defined stereochemical element that can be carried through multi-step syntheses, including formation of peptide bonds, side-chain modifications, and late-stage functional group transformations. The N-ethyl amide and acid salt form together help control reactivity by balancing nucleophilicity and acid-base behavior during intermediate preparation. Downstream, the compound can be employed to access D-amino acid building blocks for fragment-based molecular design, stereochemical diversification, and preparation of chiral libraries used in research-grade fine chemical synthesis.
4. Chemical Biology Labeling
H-D-Pro-NHEt · HCl can be applied in chemical biology workflows where D-amino acid residues are incorporated to improve stability of labeled peptides and biomolecule probes. The carboxylic acid enables coupling to activated linkers or attachment handles, while the proline ring and D-stereochemistry help preserve conformational features that may be critical for binding or recognition in assay contexts. The hydrochloride salt form can facilitate reproducible reagent dosing and can be converted to free-base conditions when preparing conjugation-ready intermediates. The resulting D-proline-containing labeled constructs can be used for biomolecule modification, probe generation, and analytical studies that rely on stereochemically defined peptide fragments.
5. Process Chemistry Intermediate
H-D-Pro-NHEt · HCl is suitable for process chemistry intermediate preparation where controlled handling of a chiral amino acid derivative is required at scale. The salt form supports storage and weighing consistency, while the amide-protected nitrogen state and the carboxylic acid functionality allow predictable downstream conversion into activated coupling intermediates. The rigid proline scaffold can reduce conformational variability in downstream steps, supporting reproducible formation of peptide bonds and minimizing side reactions associated with flexible amino acid residues. The compound can therefore be used as a manufacturing intermediate for D-amino acid-containing peptide building blocks and peptidomimetic precursors in specialty chemical production and industrial fine chemical synthesis.
2. Adipose tissue is a key organ for the beneficial effects of GLP-2 metabolic function
5. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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