Boc-4-Methoxy-L-Phenylalanine is a protected, naturally derived amino acid derivative in which the amino group is carbamylated with a Boc (tert-butoxycarbonyl) protecting group and the side chain corresponds to L-phenylalanine bearing a para-methoxy substituent on the aromatic ring. The molecule contains both a Boc-protected α-amino function and a free carboxylic acid, with the 4-methoxy group providing an electron-donating aromatic ether functionality that can influence hydrophobicity and hydrogen-bonding behavior during peptide assembly. In peptide synthesis workflows, the Boc protection supports chemoselective handling of the α-amino group while the carboxylic acid serves as the acyl component for constructing amide bonds, including in stepwise or solid-phase synthesis of substituted phenylalanine-containing peptide structures.
CAT No: CP15504
Boc-4-Methoxy-L-Phenylalanine is an N-Boc-protected L-phenylalanine derivative bearing a para-methoxy substituent on the aromatic side chain, providing both an acid-stable amino terminus for stepwise coupling and a functionalizable aromatic handle for downstream medicinal chemistry and peptide SAR workflows. This protected amino acid building block is commonly selected when aromatic electronics and steric presentation from a 4-methoxyphenyl group are important for tuning peptide properties or for preparing substituted phenylalanine motifs in complex intermediates.
1. Solid-Phase Peptide Synthesis
Boc-4-Methoxy-L-Phenylalanine is used as a protected phenylalanine building block in solid-phase peptide synthesis workflows where the N-Boc group supports controlled stepwise assembly and the 4-methoxy substitution preserves the desired aromatic substitution pattern in the final sequence. Peptide synthesis groups incorporate this residue to introduce a para-methoxyphenyl side chain that can influence local conformation, hydrophobic/aromatic character, and intermolecular interactions relevant to peptide library construction and structure-activity relationship studies. Custom peptide synthesis providers and academic peptide labs often choose this type of substituted amino acid when they need a specific aromatic substitution rather than relying on post-synthetic modification.
2. Peptide Library SAR Studies
Boc-4-Methoxy-L-Phenylalanine supports medicinal chemistry programs that generate focused peptide libraries to probe how aromatic substitution affects binding-relevant conformations and physicochemical behavior. Researchers use this residue to systematically vary side-chain electronics while keeping the peptide backbone and other residues constant, enabling clearer interpretation of how a para-methoxyphenyl group changes performance in biochemical assay readouts. In practice, this building block is valuable for producing analog panels for hit-to-lead optimization, especially when the 4-methoxyphenyl motif is a known or hypothesized pharmacophore element in peptidomimetic designs.
3. Pharmaceutical Intermediate Building Block
Boc-4-Methoxy-L-Phenylalanine is also employed as a substituted amino acid intermediate for downstream synthesis of non-peptidic fragments and peptidomimetic scaffolds that retain the 4-methoxyphenylalanine-derived aromatic motif. Pharmaceutical intermediate development teams use this compound when they need a protected, stereodefined amino acid starting material that can be carried through functional group transformations while preserving the substitution pattern on the aromatic ring. This makes it useful for preparing substituted aromatic amino acid derivatives, coupling-ready intermediates, and sequence-defined precursors used in the broader development of specialty chemical libraries.
4. Analytical Reference Standards
Boc-4-Methoxy-L-Phenylalanine can serve as a reference material in analytical method development and characterization workflows involving substituted phenylalanine residues. Analytical chemistry teams use it to validate chromatographic behavior, confirm identity during intermediate qualification, and support method tuning for LC-based separation of protected amino acid building blocks and related peptide fragments. Because the compound is stereodefined and contains a distinct 4-methoxy aromatic signature, it is particularly helpful when distinguishing closely related phenylalanine derivatives in synthesis monitoring and impurity profiling.
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