Bzl-Ser(Bzl)-OH

Bzl-Ser(Bzl)-OH is a benzyl-protected serine derivative in which the side-chain hydroxyl is benzylated (O-benzyl) and the amino group is protected as a benzyloxycarbonyl-type benzyl ester motif commonly encountered in protected amino acid chemistry, yielding a chiral amino acid framework with a free carboxylic acid. The molecule contains a stereogenic center at the serine alpha carbon, a carboxylic acid functionality for C-terminal activation, and benzyl-protected groups that modulate nucleophilicity and suppress undesired side reactions during peptide coupling. The benzylic protecting groups can be removed under hydrogenolysis conditions, enabling access to the unprotected serine alcohol for downstream functionalization or native peptide assembly. The presence of a protected side-chain hydroxyl makes the compound a practical intermediate for peptide building block preparation, side-chain modification, and stereochemically defined amino acid incorporation.

1. Protected Amino Acids

Bzl-Ser(Bzl)-OH is used in protected amino acid synthesis workflows where orthogonal protection and controlled reactivity are required for reliable peptide coupling chemistry. The serine alpha-amino functionality and the carboxylic acid enable standard activation strategies for amide bond formation, while the O-benzyl side-chain protection suppresses alcohol participation in coupling and minimizes formation of side products. Benzyl-protected groups are compatible with many peptide-manufacturing sequences and can be removed later to reveal the serine hydroxyl for subsequent derivatization. The resulting deprotected serine derivative can serve as a defined building block for generating peptide fragments and for constructing amino acid sequences with controlled side-chain chemistry.

2. Peptide Synthesis

Bzl-Ser(Bzl)-OH is applied as a peptide building block precursor in solid-phase or solution-phase peptide synthesis targeting serine-containing sequences. The free carboxylic acid supports C-terminal activation, and the protected side-chain hydroxyl helps maintain chemoselectivity by preventing intramolecular reactions or undesired O-acylation during coupling cycles. The benzyl-protected serine stereocenter provides stereochemical fidelity for incorporation into peptides, supporting consistent backbone geometry and side-chain positioning. Downstream deprotection can regenerate the serine alcohol for native peptide formation or for post-assembly functionalization, including phosphorylation-mimetic or glycomimetic elaboration strategies.

3. Side-Chain Functionalization

Bzl-Ser(Bzl)-OH is suitable for side-chain functionalization programs in chemical biology and synthetic organic chemistry where serine hydroxyl chemistry is introduced after peptide or scaffold assembly. The O-benzyl group acts as a stable protecting group that can withstand many synthetic transformations, preserving the serine alcohol from premature derivatization. Hydrogenolysis or related deprotection strategies can then unveil the hydroxyl for targeted conversion to phosphate analogs, ester derivatives, ether linkages, or clickable handles used in biomolecule labeling. The protected-to-unprotected transition makes the compound a controlled intermediate for generating serine-functionalized derivatives while maintaining the amino acid stereochemistry.

4. Bioconjugation Chemistry

Bzl-Ser(Bzl)-OH can be employed in bioconjugation chemistry as a chiral serine-containing intermediate that supports controlled introduction of hydroxyl-reactive motifs after deprotection. The benzyl-protected side chain reduces nonspecific reactivity during upstream coupling steps, while the carboxylic acid enables attachment to activated linkers or incorporation into peptide conjugation motifs. After conversion to the free serine alcohol, the hydroxyl can participate in selective derivatization routes that generate conjugates for affinity probes, surface immobilization, or multivalent labeling constructs. The defined stereochemistry and protected functional groups support reproducible downstream scaffold assembly for applied biochemical research workflows.

5. Pharmaceutical Manufacturing

Bzl-Ser(Bzl)-OH is relevant to pharmaceutical manufacturing and process chemistry as a protected amino acid intermediate used to prepare defined serine-containing fragments for peptide-based or peptidomimetic materials. The benzyl-protected side-chain hydroxyl and protected amino functionality support chemoselective coupling operations by reducing side reactions that can complicate purification and scale-up. The free carboxylic acid provides a handle for controlled activation and incorporation into intermediate peptides or processable building blocks. Deprotection compatibility with hydrogenolysis-oriented manufacturing sequences enables conversion to serine-active forms for final assembly steps, supporting reliable production of stereochemically defined intermediates used in fine chemical synthesis.

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