Boc-4-Methy-L-Phenylalanine is a Boc-protected, amino-acid derivative of L-phenylalanine bearing a 4-methyl substituent on the aromatic side chain, placing it within the class of protected aromatic amino acid building blocks for peptide-related synthesis. The molecule contains a free carboxyl group and an N-terminus protected as a tert-butoxycarbonyl (Boc) carbamate, with the side chain consisting of a substituted benzyl group that retains hydrophobic aromatic character while the stereocenter is specified as L by the product name. In synthetic workflows, this protected analogue is used as a precursor for stepwise assembly of peptides or peptide fragments, where the Boc group helps control chemoselectivity during coupling and side-reaction suppression while the substituted phenyl ring supports structure-activity and conformational studies.
CAT No: CP15804
Boc-4-Methy-L-Phenylalanine is a Boc-protected phenylalanine derivative bearing a 4-methyl substituted phenyl side chain, providing a sterically defined, hydrophobic aromatic group for downstream peptide assembly. The N-terminal Boc protecting group supports controlled coupling in protected amino acid workflows, while the side-chain methyl substitution is commonly leveraged to tune aromatic packing and hydrophobic character in peptide and peptidomimetic structures. This reagent is typically handled as a peptide building block for research-grade synthesis and intermediate development where consistent stereochemistry and protection are required.
1. Fmoc-Free Peptide Coupling
Boc-4-Methy-L-Phenylalanine is used by peptide synthesis groups that build sequences using Boc-based protection strategies, where the N-terminal Boc group enables stepwise assembly with defined reactivity control. Custom peptide manufacturers and academic peptide chemistry labs often select this specific aromatic side-chain variant to introduce a 4-methyl-substituted phenylalanine residue into peptides intended for structure-function studies, binding epitope mapping, or conformational probing. The hydrophobic 4-methyl substitution can influence local packing and side-chain environment in the final sequence, making the residue useful when researchers want to compare analogs against unsubstituted phenylalanine variants while maintaining the same stereochemical backbone.
2. Peptidomimetic And SAR Building Block
Boc-4-Methy-L-Phenylalanine supports medicinal chemistry programs that prepare peptidomimetic scaffolds and analog libraries for structure-activity relationship (SAR) evaluation. Medicinal chemistry teams frequently incorporate non-native side-chain variants to modulate steric bulk and hydrophobic surface features without changing the overall peptide backbone identity, enabling systematic comparison of aromatic substitution patterns. In this context, the protected Boc amino acid format is valued for reproducible incorporation into synthetic intermediates and for streamlining the preparation of series members used in downstream purification, characterization, and property screening workflows.
3. Pharmaceutical Intermediate Development
Boc-4-Methy-L-Phenylalanine is also used as a protected amino acid intermediate for manufacturing research intermediates that require an aromatic residue with a 4-methyl substitution pattern. Process development chemists and chemical manufacturing teams often rely on Boc-protected amino acids to standardize upstream building blocks for later conversion into larger coupling partners, fragment syntheses, or protected peptide segments. The combination of an N-terminal Boc group and a substituted phenyl side chain makes this reagent a practical choice when the downstream target demands a defined aromatic motif and consistent stereochemical identity across multistep intermediate preparation.
4. Analytical Reference For Amino Acid Derivatives
Boc-4-Methy-L-Phenylalanine is frequently employed as a defined chemical standard or comparator material in analytical method development and characterization workflows involving peptide fragments and protected amino acid derivatives. Analytical chemistry laboratories use such protected, structurally specific building blocks to confirm identity during peptide synthesis troubleshooting, to validate chromatographic separation of closely related aromatic amino acid residues, and to support method robustness when monitoring coupling steps or intermediate purity. Because the reagent contains both a Boc-protected backbone and a 4-methyl-substituted phenyl side chain, it provides a structurally unambiguous reference point for LC-MS, HPLC, or related characterization strategies used in peptide and peptidomimetic development pipelines.
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