Boc-(R)-Pga-OH is a protected amino acid derivative featuring the amino acid motif of Pga (α-amino acid backbone) with a tert-butoxycarbonyl (Boc) protecting group on the amino functionality and a free carboxylic acid at the C-terminus. The side chain of Pga is incorporated as part of the molecule and the stereochemical descriptor "(R)" specifies the configuration at the chiral center indicated by the product name, while the molecule therefore bears both a Boc-protected amine and a carboxyl group suitable for further coupling chemistry. In peptide chemistry, Boc-protected amino acids such as this are used as building blocks in stepwise synthesis and as precursors to more complex amino acid and peptide derivatives where temporary protection of the amine supports controlled formation of amide bonds.
CAT No: CP25343
CAS No:138782-45-3
Synonyms/Alias:(R)-N-Boc-4-amino-3-phenylbutyric acid;Boc-3-phenyl-gamma-aminobutyric acid;Boc-Pga(R)
Chemical Name:(3R)-4-[(t-Butoxycarbonyl)amino]-3-phenylbutanoic acid
Boc-(R)-Pga-OH is a Boc-protected, chiral amino acid building block featuring the (R)-configured side chain of Pga (pyroglutamic acid derived) in a protected form designed for controlled peptide assembly. The N-terminal Boc group supports standard protected-amino-acid workflows, while the carboxylic acid functionality enables downstream coupling to form amide bonds in peptide and peptidomimetic synthesis. This reagent is commonly selected when a specific stereochemical configuration and a protected amino terminus are required for constructing defined sequences or intermediates.
1. Peptide Building Block Use
Boc-(R)-Pga-OH is used by custom peptide synthesis groups and medicinal chemistry teams to incorporate a stereodefined Pga residue into protected peptide segments and longer constructs. The Boc-protected amino terminus provides a stable handle for sequential coupling strategies, allowing the building block to be integrated into peptide chains where the (R) configuration is critical for maintaining the intended conformational or structural properties of the target peptide. In practice, it supports the preparation of peptide intermediates that can be carried forward into solution-phase or stepwise segment condensation workflows for defined sequence assembly.
2. Peptidomimetic Intermediate Synthesis
Boc-(R)-Pga-OH is also applied in the development of peptidomimetics and constrained amino acid analogs where the Pga-derived side-chain motif is used as a structural element. Process and R&D chemists rely on Boc-protected amino acid intermediates to build library members and analog series with controlled stereochemistry, enabling systematic structure-property studies during lead optimization. The presence of a protected amino group alongside a free carboxylic acid supports conversion into activated coupling partners and subsequent amide formation steps that generate advanced intermediates for further functionalization.
3. Stereodefined Chiral Chemistry Workflows
Boc-(R)-Pga-OH is frequently selected in chiral intermediate development when downstream synthesis requires a specific (R) stereochemical outcome rather than a racemic mixture. Pharmaceutical intermediate development teams use stereochemically defined Boc-amino acid derivatives to reduce ambiguity in later coupling and purification steps, supporting reproducible assembly of chiral peptide fragments and analog scaffolds. This makes the material particularly relevant for projects where stereochemical integrity must be preserved through multiple synthetic stages to maintain the identity of sequence-defined or stereochemically constrained products.
4. Protected Amino Acid Segment Coupling
Boc-(R)-Pga-OH is employed as a protected amino acid segment component for stepwise chain extension, including the preparation of protected peptide fragments used in both research-scale and scale-up synthesis. Peptide chemistry laboratories value Boc-protected building blocks for their compatibility with established protected-amino-acid handling and iterative coupling cycles, enabling the construction of defined amide linkages while maintaining orthogonal control of functional groups during synthesis. As a result, it is commonly used to generate intermediates that can be further elaborated into final protected peptides or advanced coupling-ready derivatives.
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