H-Ser(Ac)-OH · HCl

H-Ser(Ac)-OH · HCl is an N-acetylated serine derivative provided as the hydrochloride salt, featuring the serine amino acid backbone with a protected side chain hydroxymethyl group acetylated as an acetate ester. The molecule bears a stereogenic center at the α-carbon (serine configuration preserved from the starting amino acid), and the salt form enhances handling of the amino functionality while keeping the carboxylic acid available for peptide coupling chemistry. The acetylated side-chain oxygen modulates polarity and reactivity, enabling controlled deprotection strategies to regenerate the free hydroxyl for subsequent side-chain functionalization. The combined presence of an N-acetyl group, a masked serine hydroxyl, and a carboxylic acid makes this compound a practical chiral intermediate for protected amino acid synthesis and downstream peptide building block preparation.

1. Protected Amino Acids

H-Ser(Ac)-OH · HCl supports protected amino acid chemistry in synthetic organic workflows by pairing an N-acetylated amine with an acetyl-protected serine side-chain hydroxyl. The α-carboxylic acid can participate in standard peptide coupling chemistry, while the acetylated oxygen helps suppress undesired side reactions during amide bond formation. Salt formation with HCl improves practical handling of the amino functionality during intermediate preparation and purification steps. Deprotection of the side-chain acetate can then enable selective hydroxyl reactivity for further derivatization, including phosphorylation-mimetic design and serine side-chain elaboration.

2. Peptide Synthesis

H-Ser(Ac)-OH · HCl is suitable for peptide synthesis where a serine residue with controlled side-chain protection is required to maintain chemoselectivity. The acetylated hydroxymethyl group reduces competing nucleophilicity during coupling and can be removed under conditions compatible with peptide fragments to reveal the free serine alcohol. The N-acetyl and carboxylic acid functionality align with peptide building block strategies that use amino acid derivatives as C-terminal or internal components depending on activation and protection scheme. Incorporation of this chiral serine derivative can support the construction of peptide analogs used for conformational studies and sequence-specific structure-function investigations.

3. Chemical Biology Labeling

H-Ser(Ac)-OH · HCl can be applied in chemical biology research and biomolecule modification programs that require controlled serine side-chain chemistry. The acetyl-protected hydroxyl serves as a masked handle that can be converted to a reactive alcohol after deprotection, enabling conjugation strategies such as ester formation or attachment to electrophilic linkers. The amino acid backbone and stereochemical integrity support incorporation into peptide-based probes where maintaining the native serine geometry is important for molecular recognition. Downstream derivatives can be used to generate labeled peptide reagents for mapping phosphorylation-like motifs, monitoring protein interactions, or building tool compounds for biochemical assays.

4. Peptidomimetics And SAR

H-Ser(Ac)-OH · HCl enables peptidomimetic construction and structure-activity relationship studies by providing a protected chiral serine unit that can be transformed into functional analogs. The masked side-chain acetate can be selectively removed to introduce hydroxyl-based functionality, which can then be modified into alternative substituents for SAR-driven scaffold refinement. The N-acetylated amine and carboxylic acid support iterative synthesis toward constrained or substituted peptide-like structures, including analogs used to probe hydrogen-bonding and steric contributions from the serine side chain. The resulting derivatives can serve as chemically defined intermediates for generating libraries of amino acid-containing fragments.

5. Process Chemistry Intermediate

H-Ser(Ac)-OH · HCl is applicable as a process chemistry intermediate for manufacturing routes that require a stable, protected serine derivative with predictable reactivity. The hydrochloride salt form can aid in reproducible handling of the amino functionality, while the acetylated side chain reduces uncontrolled hydroxyl participation during activation and coupling steps. The presence of both N-acetyl and carboxylic acid groups supports scalable conversion into activated intermediates for fine chemical synthesis and peptide building block preparation. Deprotection and subsequent functionalization steps can be integrated into downstream manufacturing sequences to produce protected or functionalized serine-containing intermediates for broader industrial peptide and specialty chemical production.

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