H-Hyp(Bzl)-OH · HCl is a protected amino acid derivative of hydroxyproline in which the hydroxyl-bearing proline ring is present as a free carboxylic acid and a benzyl-protected side-chain alcohol (Hyp(Bzl)), with the amino group in the form of a hydrochloride salt. The molecule contains an amino functionality associated with chloride, a carboxylic acid group, and a benzyloxymethyl substituent on the hydroxyproline side chain that masks the alcohol to reduce undesired side reactions during coupling chemistry. As an amino acid hydrochloride salt bearing a benzyl ether, it is commonly employed as a building block for peptide synthesis and for preparing hydroxyproline-containing peptide derivatives, where controlled deprotection and chemoselective amide formation are required.
H-Hyp(Bzl)-OH · HCl is a hydrochloride salt form of N-unprotected hydroxyproline bearing a benzyl ester (Bzl) on the side-chain hydroxyl, yielding a chiral amino acid derivative with a free carboxylic acid and a benzyl-protected hydroxy group. The presence of the Hyp backbone provides a secondary amine functionality that can participate in peptide coupling after salt-associated proton equilibria, while the benzyl-protected hydroxyl modulates hydrogen-bonding and suppresses undesired side reactions during acylation. The hydrochloride counterion improves handling of the amino acid intermediate and can influence solubility and reactivity in peptide synthesis workflows. The benzyl ester protection strategy is compatible with standard peptide chemistry conditions and can be removed under hydrogenolysis to regenerate the native hydroxyproline functionality for downstream biochemical studies or scaffold elaboration.
1. Peptide Synthesis
H-Hyp(Bzl)-OH · HCl is applied in peptide coupling workflows where hydroxyproline serves as a conformationally constrained residue for turn-inducing sequences and collagen-mimetic motifs. The free carboxylic acid and amino acid backbone enable formation of amide bonds using standard peptide coupling chemistries, while the benzyl-protected side-chain hydroxyl helps prevent competing O-acylation or side-chain derivatization during chain assembly. The hydrochloride salt form can support consistent amino functionality during coupling steps and subsequent purification of protected peptide intermediates. The resulting hydroxyproline-containing peptide building blocks can be used to generate protected or deprotected peptide analogs for structure-function investigations and synthetic methodology development in peptide science.
2. Side-Chain Functionalization
H-Hyp(Bzl)-OH · HCl is utilized for side-chain functionalization strategies that require controlled liberation of the hydroxyproline hydroxyl group after peptide or fragment construction. The benzyl (Bzl) protection on the hydroxy group provides a stable handle that can be carried through amide bond formation, then converted to the free hydroxy functionality via deprotection to enable further transformations such as esterification, ether formation, or conjugation chemistry. The stereogenic center of hydroxyproline maintains defined spatial orientation of the side-chain hydroxyl, which can be relevant for binding-site mimicry in peptidomimetics and for reproducible derivatization patterns. The compound therefore functions as a chiral amino acid intermediate for generating downstream functionalized derivatives used in chemical biology tool development and materials-oriented linker design.
3. Chiral Synthesis Intermediate
H-Hyp(Bzl)-OH · HCl is suitable as a chiral amino acid intermediate in asymmetric synthesis and stereochemically controlled fragment assembly for peptide-like scaffolds. The hydroxyproline stereocenter and the protected side-chain hydroxyl provide a defined three-dimensional motif that can be incorporated into larger chiral building blocks through amide coupling and subsequent protection/deprotection logic. The benzyl-protected hydroxyl reduces polarity and can improve compatibility with organic-phase synthetic steps, while the hydrochloride salt form supports handling as a defined precursor in chiral intermediate preparation. The compound can be employed to construct stereochemically consistent libraries of protected hydroxyproline derivatives used in structure-activity relationship studies and synthetic organic chemistry campaigns.
4. Bioconjugation Chemistry
H-Hyp(Bzl)-OH · HCl supports bioconjugation chemistry workflows where hydroxyproline-containing linkers are required for attaching biomolecule-reactive handles to proteins, peptides, or polymer backbones. The benzyl-protected hydroxyl allows the intermediate to be processed under conditions that favor amide bond formation or linker assembly without premature side-chain reactivity, while deprotection can later reveal the hydroxyl group for conjugation strategies such as activation to leaving groups or coupling via hydroxyl-reactive chemistries. The amino acid backbone provides a predictable attachment point for incorporating the hydroxyproline motif into conjugates, including collagen-mimetic probes and enzyme substrate analogs. The hydrochloride salt form can be advantageous for preparing reproducible conjugation-ready intermediates that maintain stereochemical integrity of the hydroxyproline residue.
5. Pharmaceutical Manufacturing
H-Hyp(Bzl)-OH · HCl is relevant to pharmaceutical manufacturing for the preparation of hydroxyproline-containing peptide intermediates used in active pharmaceutical ingredient synthesis and process development. The compound's protected hydroxy group strategy aligns with manufacturing constraints that require suppression of side reactions during peptide coupling, while the free carboxylic acid enables controlled conversion into activated acyl species or direct coupling to protected amines in downstream steps. The benzyl protection can be selected to match a robust deprotection window that regenerates the hydroxy functionality for subsequent elaboration or for final API assembly. The hydrochloride salt form can facilitate consistent dosing of the chiral amino acid intermediate in multistep synthesis, supporting reliable material flow in fine chemical and peptide manufacturing operations.
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