Bz-RS-iSer(3-Ph)-OMe

Bz-RS-iSer(3-Ph)-OMe is a benzoyl-protected, side-chain functionalized serine methyl ether derivative presented as an RS (racemic) chiral amino acid intermediate. The structure contains a benzoyl (Bz) N-protecting group on the amino nitrogen, a serine-derived side chain bearing a 3-phenyl substituent, and a methyl ester (OMe) at the carboxyl terminus, together creating a protected amino acid ester suitable for controlled peptide coupling and subsequent deprotection sequences. The benzylic and aromatic features introduce distinct steric and electronic characteristics that can influence acylation rates, coupling selectivity, and downstream transformations of the side-chain hydroxyl functionality. The combination of protected amine, activated carboxyl ester, and a stereogenic center at the serine framework makes this compound a practical chiral building block for peptide analog construction, derivatization chemistry, and synthetic intermediate preparation.

1. Peptide Synthesis

Bz-RS-iSer(3-Ph)-OMe supports peptide building workflows in solid-phase or solution-phase synthesis where an N-protected amino acid ester is required for amide bond formation. The benzoyl-protected amine and esterified carboxyl group provide compatible handles for peptide coupling chemistry, while the serine-derived side chain with a 3-phenyl substituent can be incorporated to generate defined steric environments in the growing sequence. The stereogenic RS configuration can be used to access racemic peptide analogs for initial library generation or to serve as a precursor in stereochemical refinement strategies. Downstream conversion of the methyl ester to other carboxyl activation states and controlled manipulation of the side-chain hydroxyl can enable systematic variation of peptide properties for structure-guided scaffold development.

2. Side-Chain Functionalization

Bz-RS-iSer(3-Ph)-OMe is relevant to side-chain modification chemistry due to the serine hydroxyl functionality embedded in a phenyl-substituted framework. The benzoyl N-protection helps maintain amine stability during hydroxyl derivatization steps, enabling selective formation of ether or ester variants that tune polarity, hydrogen-bonding, and conformational preferences. The methyl ester terminus can be transformed into alternative acyl derivatives for subsequent coupling or for generating carboxylate-based analogs used in medicinal chemistry campaigns. The resulting functionalized amino acid derivatives can feed into peptidomimetic construction, SAR-focused analog libraries, and intermediate preparation for further synthetic diversification.

3. Chiral Building Block Development

Bz-RS-iSer(3-Ph)-OMe functions as a chiral amino acid intermediate for stereochemical studies and chiral synthesis development where controlled access to serine-based stereocenters matters. The RS designation indicates racemic material at the serine stereocenter, which can be employed for parallel synthesis of diastereomeric outcomes after conversion to derivatives suitable for resolution or stereoselective downstream transformations. The benzoyl-protected amine and esterified carboxyl group provide stable protection patterns that can survive multiple synthetic operations while retaining the core stereochemical information for later incorporation into peptide or non-peptide scaffolds. The 3-phenyl side-chain substitution adds a stereochemically informative steric element that can influence separation behavior and can be leveraged when designing chiral analog series for method development.

4. Chemical Biology Probes

Bz-RS-iSer(3-Ph)-OMe can be applied to chemical biology research requiring amino acid-derived building blocks for probe and ligand synthesis. The protected amino acid ester format supports incorporation into peptide-like structures that can be used as recognition elements, while the phenyl-substituted serine side chain can modulate aromatic interactions and local hydrophobicity in binding assays. The benzoyl N-protection and methyl ester provide orthogonal functional-group management, supporting sequential deprotection and conjugation planning for attaching reporters or affinity tags. The compound can therefore serve as a practical intermediate for generating labeled peptide analogs, receptor-binding probes, or enzyme-interaction tools that depend on defined stereochemistry and side-chain topology.

5. Pharmaceutical Manufacturing Intermediates

Bz-RS-iSer(3-Ph)-OMe is suitable for industrial intermediate preparation in manufacturing settings that require protected amino acid derivatives as feedstocks for downstream API-related or process-related syntheses. The benzoyl-protected amine and methyl ester form a protected amino acid ester motif that can be converted into activated carboxylic acid derivatives and subsequently coupled under controlled conditions to build larger amide-containing intermediates. The aromatic 3-phenyl side chain can be carried through synthetic sequences to yield defined stereochemical and structural motifs in peptide-like intermediates used for process development and fine chemical production. The ability to manage protection and functional group interconversions from a single chiral amino acid platform supports scalable route design for specialty intermediates and structured molecular fragments used in pharmaceutical manufacturing workflows.

6. Fine Chemical Synthesis

Bz-RS-iSer(3-Ph)-OMe serves as a fine chemical synthesis intermediate for constructing substituted serine derivatives, peptidomimetics, and non-natural amino acid analogs. The presence of an N-protecting benzoyl group and an esterified carboxyl terminus enables planned transformations that preserve the amino acid framework while allowing selective functional group chemistry on the side chain. The methyl ester can be used as a handle for conversion to other carboxyl activation states, while the phenyl-substituted serine side chain can be retained to introduce aromatic character into synthetic targets. The compound's protected structure and stereogenic center make it applicable to iterative derivatization strategies that generate libraries of amino acid derivatives for analytical standards, molecular design studies, and downstream scaffold elaboration.

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