Boc-L-Arg(Pbf)-OH is a protected, naturally occurring amino acid derivative in which the L-arginine side chain is functionalized with a Pbf (2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl) protecting group on the guanidinium moiety and the α-amino group is protected as a Boc (tert-butoxycarbonyl) carbamate. The molecule bears a free carboxylic acid for coupling chemistry, while the Boc group and the Pbf-protected guanidinium are designed to suppress undesired side reactions during stepwise peptide assembly and to control chemoselectivity at the reactive amine and guanidinium functionalities. Boc-L-Arg(Pbf)-OH is employed as an amino acid building block for solid-phase peptide synthesis and related peptide synthesis workflows where arginine side-chain protection is required to maintain compatibility with sequential deprotection/coupling strategies.
CAT No: CP25550
CAS No:200124-22-7
Chemical Name:N-alpha-(t-Butyloxycarbonyl)-N-2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl-L-arginine
Boc-L-Arg(Pbf)-OH is a protected L-arginine building block designed for peptide synthesis, featuring an N-terminal Boc (tert-butoxycarbonyl) protecting group and a Pbf (pentamethylbenzyloxycarbonyl) side-chain protection on the arginine guanidinium functionality. This protection pattern preserves the strongly basic side chain during coupling and subsequent peptide assembly, enabling reliable incorporation of arginine residues into complex sequences. The Boc/Pbf combination is widely used in workflows where orthogonal deprotection and controlled side-chain chemistry are required for high-fidelity peptide construction.
1. Solid-Phase Peptide Synthesis
Boc-L-Arg(Pbf)-OH is frequently used by peptide synthesis service providers and research groups building arginine-containing peptides on solid supports, where the protected guanidinium group must remain intact through repetitive deprotection and coupling cycles. The Boc-protected alpha-amino group supports standard stepwise assembly, while the Pbf side-chain protection helps prevent undesired side reactions associated with the arginine guanidinium during chain elongation. This makes the reagent a practical choice for generating peptides that require multiple arginine residues, basic-rich segments, or sequences where side-chain integrity is critical for downstream purification and characterization.
2. Protected Arginine Segment Coupling
Boc-L-Arg(Pbf)-OH is also used in solution-phase and segment condensation strategies when assembling peptide fragments that contain arginine at defined positions. In these workflows, maintaining orthogonal protection of the arginine side chain is important for controlling reactivity during fragment coupling and for minimizing side reactions that can complicate purification. Chemists developing longer peptide intermediates or preparing sequence-defined libraries often select Boc-L-Arg(Pbf)-OH to ensure that the arginine side chain remains masked until the intended global or selective deprotection step, supporting consistent yields and reproducible product profiles across batches.
3. Basic Peptide Library Construction
Boc-L-Arg(Pbf)-OH is commonly selected for constructing peptide libraries and sequence variants where arginine-containing motifs are central to structure-activity relationship studies and binding assay development. The Pbf-protected guanidinium group supports incorporation of arginine in a manner compatible with iterative synthesis and purification workflows, including peptides that are difficult to handle due to high basicity. By using a standardized protected arginine building block, researchers can streamline library synthesis of cationic peptides, improve batch-to-batch consistency, and reduce the likelihood of side-chain scrambling or premature guanidinium reactivity during assembly.
4. Pharmaceutical Intermediate Peptide Development
Boc-L-Arg(Pbf)-OH is used in medicinal chemistry and peptide therapeutics development programs to prepare arginine-bearing peptide intermediates for further functionalization, conjugation, or formulation-oriented studies. The protected form supports controlled downstream processing by keeping the guanidinium functionality protected during intermediate synthesis steps, which is particularly valuable when the peptide scaffold must tolerate additional chemical modifications. Development teams and custom synthesis laboratories rely on Boc-L-Arg(Pbf)-OH to reliably install arginine residues into advanced intermediates while maintaining side-chain stability through the synthetic sequence.
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