Boc-Ser(p-chloro-Bzl)-OH · DCHA is a protected serine amino acid derivative in which the amino terminus is masked as a Boc carbamate and the side-chain hydroxyl is benzylated with a p-chloro substituent, yielding a serine building block suitable for peptide-related synthesis. The molecule contains a Boc-protected amine, a free carboxylic acid, and a benzyl ether side-chain bearing a p-chloro group, while the "· DCHA" indicates association with dicyclohexylamine as a counterion for handling and isolation. In synthetic workflows, the orthogonal protection pattern supports stepwise incorporation of the serine residue into peptide intermediates while the benzyl ether and Boc group provide chemoselectivity during coupling and subsequent deprotection steps, and the p-chloro benzyl substituent offers an additional handle for downstream structural studies or derivatization.
Boc-Ser(p-chloro-Bzl)-OH · DCHA is a protected serine derivative featuring a tert-butoxycarbonyl (Boc) group on the amino function and a benzyl-protected side-chain hydroxyl bearing a p-chloro substituent on the benzyl ring. The molecule preserves the serine stereocenter and presents a masked alcohol that can be selectively unmasked under hydrogenolysis conditions, while the Boc group enables controlled N-deprotection during peptide assembly. The p-chloro-benzyl substituent increases aromatic character and modulates side-chain deprotection behavior relative to unsubstituted benzyl ethers, supporting orthogonal protection schemes in peptide synthesis. As an amino acid ester-free, N-protected amino acid building block paired with DCHA (dicyclohexylamine salt), it is commonly handled as a chiral, solid-state intermediate with reactivity aligned to peptide coupling chemistry and downstream functionalization of the serine side chain.
1. Peptide Synthesis
Boc-Ser(p-chloro-Bzl)-OH · DCHA is used in peptide building block preparation for stepwise solid-phase or solution-phase peptide synthesis where controlled N- and O-protection is required. The Boc-protected amine participates in standard peptide coupling after deprotection, while the O-(p-chlorobenzyl) ether protects the serine hydroxyl from acylation and side reactions during chain elongation. The preserved serine stereochemistry supports incorporation into peptide sequences with defined backbone geometry and side-chain orientation, enabling construction of peptides that require selective serine deprotection later for phosphorylation, glycosylation, or further derivatization. The resulting serine-containing intermediates can be converted into peptide analogs and protected fragments suitable for sequential coupling and late-stage functional group installation, aligning with amino acid chemistry and peptide science workflows.
2. Side-Chain Functionalization
Boc-Ser(p-chloro-Bzl)-OH · DCHA serves as a protected side-chain precursor for serine hydroxyl derivatization in chemical biology and synthetic organic chemistry. The O-(p-chlorobenzyl) group masks the alcohol during manipulations that may involve amide bond formation, esterification, or heteroatom chemistry, while the p-chloro benzyl ether can be removed to regenerate a reactive serine hydroxyl for subsequent transformations. The Boc group provides a stable N-protection handle that can be removed independently when converting the amino acid into peptide fragments, lactones, or hydroxyl-bearing motifs used in molecular recognition studies. Downstream use frequently includes access to serine-functionalized scaffolds for generating hydroxyl-reactive intermediates, enabling controlled synthesis of analog libraries and stereochemically defined functionalized compounds.
3. Bioconjugation Chemistry
Boc-Ser(p-chloro-Bzl)-OH · DCHA can be applied in bioconjugation workflows that require incorporation of protected serine residues into peptide linkers or conjugation handles. The protected amino acid format supports assembly of peptide segments bearing a serine side chain that can be deprotected at a chosen stage to introduce hydroxyl functionality for subsequent coupling to electrophiles, affinity tags, or polymerizable groups. The orthogonality between Boc deprotection and benzyl-ether removal supports staged construction of conjugates, minimizing undesired crosslinking or side reactions during linker synthesis. The chiral serine center and controlled side-chain presentation can then be carried into conjugate architectures used for labeling, immobilization, and biomolecule modification strategies in applied biochemical research.
4. Peptidomimetics And SAR Studies
Boc-Ser(p-chloro-Bzl)-OH · DCHA is suitable for peptidomimetic construction and structure-activity relationship studies where serine-containing motifs are used as stereochemically defined functional elements. The Boc-protected amine and O-protected serine hydroxyl enable incorporation into constrained scaffolds, allowing chemists to generate analogs with controlled hydrogen-bonding patterns and side-chain reactivity profiles. The p-chloro benzyl protection can support selective deprotection timing, which is relevant when building multi-functional molecules that include other protected groups requiring orthogonal removal. The resulting serine-bearing intermediates can be used to prepare libraries of peptide-like compounds and SAR-focused derivatives, supporting systematic evaluation of how serine side-chain chemistry influences molecular recognition and binding conformations.
5. Pharmaceutical Intermediate Preparation
Boc-Ser(p-chloro-Bzl)-OH · DCHA can function as a process-relevant intermediate for manufacturing routes that require protected amino acid building blocks for peptide-derived or peptide-inspired intermediates. The Boc-protected nitrogen and benzyl-protected hydroxyl provide chemical stability during upstream synthesis steps, while the maintained stereochemistry supports reproducible incorporation into downstream coupling operations. DCHA salt formation can improve handling characteristics for large-scale preparation of protected amino acid intermediates, facilitating consistent feedstock quality for coupling and purification steps in fine chemical production. Downstream, deprotection and coupling transformations enable access to serine-containing fragments used in the synthesis of peptide intermediates, complex building blocks, and other industrially produced functional molecules derived from amino acid chemistry.
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