H-Ser(Bzl)-OMe · HCl

H-Ser(Bzl)-OMe · HCl is a hydrochloride salt of the protected serine methyl ester bearing a benzyl group on the side-chain hydroxyl, corresponding to an N-terminal free amino acid ester framework with defined stereochemistry at the serine alpha-carbon. The molecule contains a primary amino functionality as its salt form, a methyl ester at the carboxyl terminus, and a benzyl-protected side-chain alcohol that modulates hydrogen-bonding and suppresses undesired side reactions during coupling. Benzyl protection and esterification together create a controlled reactivity profile that supports peptide building block preparation and selective transformations at the amino and carboxyl sites. The salt form can improve handling of the amino ester intermediate in synthetic workflows that require consistent solubility and reproducible coupling behavior.

1. Protected Amino Acid Chemistry

H-Ser(Bzl)-OMe · HCl is used in protected amino acid synthesis workflows where the benzyl-protected side-chain hydroxyl and methyl ester enable selective functional group manipulation. The N-terminal free amine (as the HCl salt) and the esterified carboxyl group participate in peptide coupling chemistry while the Bzl ether reduces competing acylation or oxidation of the serine hydroxyl. The methyl ester can be converted to other C-terminal activation states or hydrolyzed to the corresponding acid for downstream incorporation into peptide sequences. The benzyl-protected serine side chain also supports controlled deprotection strategies that regenerate the native hydroxyl for subsequent derivatization or biological mimicry.

2. Peptide Synthesis

H-Ser(Bzl)-OMe · HCl serves as a serine methyl ester peptide building block in solid-phase or solution-phase peptide coupling planning where orthogonal protection of the side-chain hydroxyl is required. The protected serine framework provides a defined nucleophile set for amide bond formation at the amino and carboxyl termini, while the benzyl group maintains side-chain inertness under common coupling and purification conditions. The ester handle can be managed as an intermediate stage for generating activated carboxyl derivatives or for tailoring C-terminal chemistry before assembly into longer peptides. The resulting serine-containing peptide analogs can be designed for later hydroxyl-unmasking to enable phosphorylation-mimicking chemistry, conjugation, or structure-activity relationship studies.

3. Bioconjugation Chemistry

H-Ser(Bzl)-OMe · HCl can be applied in bioconjugation and chemical biology reagent preparation where controlled access to a serine side-chain hydroxyl is needed for site-specific functionalization. The benzyl-protected hydroxyl allows the amino acid ester to be handled without premature reactivity toward electrophiles used for linker installation or coupling to biomolecule scaffolds. Hydroxyl deprotection after conjugation planning can regenerate the alcohol for subsequent derivatization such as esterification, ether formation, or attachment of affinity tags and cleavable linkers. The amino acid backbone and stereogenic center support incorporation into peptide-based conjugates that preserve conformational features relevant to biomolecular recognition.

4. Peptidomimetics And SAR Studies

H-Ser(Bzl)-OMe · HCl supports peptidomimetic and structure-activity relationship studies by providing a stereochemically defined serine unit whose side-chain hydroxyl can be unmasked and functionalized to tune polarity and hydrogen-bonding. The benzyl-protected hydroxyl can be carried through synthesis to maintain compatibility with peptide coupling steps, while the methyl ester can be transformed into alternative termini for analog generation. Side-chain hydroxyl regeneration enables systematic modification into derivatives such as substituted serine analogs, ester/amide variants, or handle-bearing constructs for library synthesis. The ability to control when the serine hydroxyl becomes reactive aligns with iterative SAR workflows that require consistent stereochemical presentation of functional groups.

5. Process Chemistry Intermediate

H-Ser(Bzl)-OMe · HCl is suitable for process chemistry intermediate preparation where salt formation, protection strategy, and ester handling are used to manage reactivity and impurity pathways. The HCl salt of the amino ester can improve operational consistency in manufacturing-scale syntheses by influencing solubility and mitigating free-amine side reactions during isolation and coupling setup. The benzyl ether and methyl ester provide chemically stable protecting groups that can withstand typical activation and purification steps before planned deprotection or conversion to other C-terminal forms. The compound's protected serine structure therefore functions as a controllable chiral intermediate for producing downstream protected amino acids, peptide fragments, and serine-containing fine chemicals used in industrial peptide and specialty chemical production.

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