Bpoc-Arg(Mtr)-OH

Bpoc-Arg(Mtr)-OH is an N-protected L-arginine derivative designed for peptide synthesis and side-chain-controlled functionalization. The molecule contains a protected guanidinium side chain bearing a Mtr (4-methoxy-2,3,6-trimethylbenzenesulfonyl-type) protecting group, while the α-amino group is masked as a Bpoc (benzyloxycarbonyl-type) carbamate/oxazolidinone-derived protection motif that can be removed under peptide-compatible conditions. The stereogenic center at the α-carbon is retained in the L-configuration, and the carboxylic acid enables C-terminal coupling chemistry when used as a building block. The combination of orthogonal N- and side-chain protection strategies produces a controlled reactivity profile that supports selective deprotection, guanidinium unmasking, and downstream derivatization of arginine-containing sequences.

1. Peptide Synthesis

Bpoc-Arg(Mtr)-OH is used as an arginine peptide building block for solid-phase and solution-phase peptide coupling, where orthogonal protection supports sequential assembly of protected Arg residues. The protected α-carboxylic acid and Bpoc-masked α-amino group participate in standard peptide coupling workflows, while the Mtr-protected guanidinium side chain remains inert during chain elongation. Controlled deprotection of the N-protecting group and later unmasking of the guanidinium functionality enable formation of salt-bridging and hydrogen-bonding interactions characteristic of arginine in peptide scaffolds. The resulting Arg-containing intermediates can be converted into full-length peptides, peptide fragments, and protected peptide segments for biochemical research and synthetic methodology development.

2. Chemical Biology

Bpoc-Arg(Mtr)-OH is applied in chemical biology workflows that require defined arginine side-chain presentation for binding studies, cellular uptake probes, and receptor-interaction mapping. The guanidinium functionality, once unmasked from the Mtr group, provides a strongly basic, multidentate charge distribution that can drive electrostatic recognition and can be tuned by conjugation to labels or affinity handles. Bpoc-Arg(Mtr)-OH can serve as a controlled intermediate for preparing arginine-modified peptides or peptidomimetic linkers that maintain stereochemical fidelity at the α-center. Downstream derivatives can be incorporated into molecular probes and structure-activity relationship (SAR) libraries to interrogate recognition motifs involving cationic amino acid residues.

3. Bioconjugation Chemistry

Bpoc-Arg(Mtr)-OH is suitable for bioconjugation strategies that rely on arginine-containing peptide handles for attachment to biomolecules and surfaces. The protected guanidinium group enables stepwise synthesis of conjugatable peptides without premature side-chain reactivity, while deprotection can reveal the cationic guanidinium for subsequent salt-bridge formation or for coupling into defined bioconjugate architectures. The Bpoc-protected α-amino group supports peptide bond formation to generate stable linkers that can be functionalized at termini for attachment to proteins, polymers, or nanoparticles. The stereodefined arginine residue provides a consistent recognition element in downstream conjugates used for analytical research, biomolecule labeling, and material-functionalization studies.

4. Peptidomimetics And SAR

Bpoc-Arg(Mtr)-OH is employed in peptidomimetic construction and SAR studies where arginine side-chain geometry and charge density are required to model or optimize bioactive interfaces. The L-arginine backbone stereochemistry and the protected guanidinium group allow synthesis of analogs that preserve key electrostatic and hydrogen-bonding patterns while varying the surrounding peptide framework. Orthogonal deprotection enables selective introduction of modifications at the N-terminus or side-chain timing, supporting systematic library generation of Arg-containing mimetics. The compound thus functions as a chiral amino acid intermediate for building structure-defined scaffolds used to probe sequence-dependent binding and interaction strength.

5. Pharmaceutical Manufacturing

Bpoc-Arg(Mtr)-OH is relevant to pharmaceutical manufacturing and process chemistry as a protected arginine intermediate for producing protected peptide intermediates under scalable synthetic conditions. The dual protection scheme (Bpoc at the α-amino position and Mtr on the guanidinium side chain) supports controlled handling during coupling and purification steps, reducing undesired side reactions from the strongly basic guanidinium group. The free carboxylic acid facilitates incorporation into peptide fragments that can be carried forward through manufacturing-grade peptide assembly and final deprotection sequences. Downstream, the compound can be integrated into robust routes for producing arginine-containing peptide APIs, peptide intermediates, and peptide-based process streams where stereochemical integrity and functional-group orthogonality are required.

6. Analytical Research Standards

Bpoc-Arg(Mtr)-OH is used to prepare defined arginine-containing standards and reference materials for analytical method development involving peptides and amino acid derivatives. The protected form supports clean synthesis of peptides with known Arg content and controlled side-chain deprotection timing, enabling reproducible generation of reference analytes for LC-MS, CE, or HPLC method validation. Unmasking of the guanidinium group from the Mtr protection yields a consistent cationic motif that improves interpretability of chromatographic behavior and mass spectral features in peptide analysis. The compound therefore serves as a chiral, structurally characterized intermediate for generating analytical controls and calibration materials in peptide science and biochemical research workflows.

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