Boc-D-Arg(Mts)-OH · CHA is a protected amino acid derivative of arginine in which the α-amino group is masked with a Boc (tert-butoxycarbonyl) protecting group and the side-chain guanidinium functionality is protected as an Mts (mesitylenesulfonyl) derivative, with the D-stereochemical form indicated by the product name. The molecule contains a carboxylic acid functional group and a Boc-protected amine, while the guanidinium side chain bears the Mts sulfonamide-type protection to modulate basicity and chemoselectivity during peptide coupling steps; the "· CHA" denotes an associated co-crystal or solvate form with a specified solvent/association component. In peptide chemistry and chemical biology workflows, this protected arginine analogue is used as a stepwise building block for preparing protected peptide intermediates and for incorporating a D-configured, side-chain-protected arginine residue into larger peptide structures under controlled reactivity conditions.
Boc-D-Arg(Mts)-OH · CHA is a protected D-configured arginine building block designed for peptide synthesis workflows, featuring a Boc-protected alpha-amino group and an Mts-protected guanidino side chain. The Mts (mesitylenesulfonyl) group provides side-chain protection compatible with common peptide assembly conditions, while the CHA component indicates an associated counterion/solvate form used to support handling and preparation of the reagent for downstream coupling. This amino acid derivative is used by peptide chemists when stereochemical control at the arginine position and robust side-chain protection are required for clean segment coupling and subsequent deprotection steps.
1. Solid-Phase Peptide Synthesis
Boc-D-Arg(Mts)-OH · CHA is commonly selected for solid-phase peptide synthesis when D-arginine incorporation is needed to probe structure, stability, or protease processing in peptide constructs. Peptide synthesis teams use this reagent to build arginine-containing sequences with a protected guanidino functionality that remains masked during chain elongation, supporting reliable coupling at the side-chain level. The Boc-protected alpha-amino group aligns with standard protected-amino-acid strategies, enabling controlled deprotection and iterative assembly of peptide segments that require D-configuration at the arginine residue.
2. Peptide Fragment Coupling
Boc-D-Arg(Mts)-OH · CHA is frequently employed in fragment condensation and solution-phase segment assembly where stereodefined arginine residues must be introduced with minimal side reactions. In custom peptide manufacturing and research synthesis, the Mts-protected guanidino group helps maintain chemoselectivity during coupling, allowing chemists to manage reactivity across multiple functional groups present in longer peptide fragments. This makes the reagent useful for assembling arginine-rich motifs, where unprotected guanidines can complicate purification and promote undesired interactions during intermediate handling.
3. Arginine-Containing Peptide Libraries
Boc-D-Arg(Mts)-OH · CHA is used to generate peptide libraries that include D-arginine variants for structure-activity relationship studies and sequence optimization in chemical biology research. Library builders rely on consistent side-chain protection to improve reproducibility across many analogs, particularly when comparing positional effects, stereochemical effects, or backbone constraints in arginine-containing peptides. The protected guanidino functionality supports parallel synthesis workflows by reducing variability associated with guanidine reactivity, thereby simplifying downstream purification and analytical characterization of library members.
4. Pharmaceutical Intermediate Development
Boc-D-Arg(Mts)-OH · CHA is also applied as a stereochemically defined protected arginine intermediate in the preparation of more complex peptide-like intermediates used in medicinal chemistry programs. Process development teams and synthetic chemists use this reagent when a D-arginine residue must be introduced into protected scaffolds while keeping the guanidino group masked until the appropriate stage of deprotection or further functionalization. The reagent's protected-state design supports controlled downstream transformations, aligning with industrially relevant workflows that require predictable handling of strongly basic side chains.
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