Boc-2,5-Dichloro-L-Phenylalanine is a Boc-protected, amino acid derivative of L-phenylalanine in which the phenyl side chain bears two chlorine substituents at the 2- and 5-positions. The molecule contains an N-terminal tert-butoxycarbonyl (Boc) protecting group on the amino functionality and a free carboxylic acid, while the chlorinated aromatic ring provides increased hydrophobic character and halogenated substitution patterns that can influence peptide conformation and intermolecular interactions. It is used in peptide synthesis and medicinal chemistry-oriented structure-activity studies as a protected building block that enables stepwise incorporation of the 2,5-dichlorophenyl side chain into peptide frameworks under controlled chemoselectivity.
CAT No: CP12204
Boc-2,5-Dichloro-L-Phenylalanine is a Boc-protected L-phenylalanine derivative bearing two chlorine substituents on the aromatic ring (2,5-dichloro substitution pattern). This halogenated, sterically and electronically modified amino acid building block is commonly used in peptide and peptidomimetic synthesis workflows where aryl halogenation is leveraged to tune physicochemical properties and provide a robust handle for downstream structure-activity relationship studies. The Boc group supports controlled amino protection during coupling and segment assembly, making the compound a practical intermediate for generating defined, halogenated peptide sequences.
1. Halogenated Peptide Building Block
Boc-2,5-Dichloro-L-Phenylalanine is used by custom peptide synthesis groups and medicinal chemistry teams to introduce a 2,5-dichloro-substituted phenylalanine residue into peptide leads and analog libraries. The Boc-protected amino functionality enables reliable incorporation during protected-amino-acid assembly, while the dichloro aromatic side chain provides a distinct electronic and steric profile compared with unsubstituted phenylalanine. This makes the residue particularly useful when researchers want to systematically vary aromatic substitution patterns to probe structure-activity relationships, improve chemical stability in chemical development programs, or modulate hydrophobicity and overall material-like character of peptide scaffolds.
2. Peptidomimetic SAR Intermediates
Boc-2,5-Dichloro-L-Phenylalanine serves as a key amino acid intermediate for peptidomimetic and constrained scaffold development in pharmaceutical intermediate manufacturing and medicinal chemistry R&D. The 2,5-dichloro substitution pattern on the phenyl ring is frequently selected to create analog series that differ in halogen identity, substitution position, or aromatic electronics, supporting SAR campaigns where small changes in aromatic substitution can strongly affect downstream synthetic outcomes and physicochemical behavior of the final compounds. Because the amino group is protected as Boc, the building block is well-aligned with workflows that require defined coupling-ready segments before further functionalization or conversion to higher-complexity intermediates.
3. Protected Amino Acid Segment Synthesis
Boc-2,5-Dichloro-L-Phenylalanine is applied in solution-phase and protected-segment peptide assembly where a Boc-protected, halogenated amino acid is needed as a controlled unit for stepwise construction. Peptide chemists use this type of protected halogenated residue to maintain compatibility with standard protected-amino-acid strategies during chain elongation, ensuring that the reactive amine is masked until the intended coupling step. The presence of two chlorine atoms on the aromatic ring also helps deliver a chemically distinct residue for downstream analytical characterization of assembled sequences, supporting workflows that require unambiguous incorporation of modified aromatic side chains in synthetic libraries.
4. Analytical Reference Standards
Boc-2,5-Dichloro-L-Phenylalanine is also used as a defined, chemically characterized reference material in analytical method development and characterization of halogenated peptide intermediates. In practice, researchers preparing LC-MS or related analytical workflows for peptide fragments and intermediates often rely on authentic protected amino acid standards to confirm identity, monitor reaction progress, and support method validation for halogenated aromatic species. The Boc-protected form and the specific 2,5-dichloro substitution pattern make it a useful benchmark when distinguishing closely related phenylalanine derivatives during purification and characterization of peptide synthesis outputs.
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