2,5-Dichloro-DL-Phenylalanine is a halogenated phenylalanine derivative in which two chlorine atoms are substituted on the aromatic ring at the 2- and 5-positions, while the amino acid backbone retains the amino (NH2) and carboxyl (COOH) functional groups. The "DL" designation indicates a racemic mixture of stereoisomers at the α-carbon, and the molecule bears a substituted benzyl side chain whose increased hydrophobicity and electron-withdrawing character can influence peptide incorporation and aromatic interactions. In synthesis and structure-activity studies, it is used as a non-natural amino acid building block to prepare modified peptides and analogues for chemical biology experiments, including labeling or comparative binding investigations where aryl halogen substitution patterns are varied.
CAT No: CP12203
2,5-Dichloro-DL-Phenylalanine is a halogenated phenylalanine derivative supplied as a DL (racemic) mixture, featuring two chlorine substituents on the aromatic ring that strongly influence electronic character and downstream reactivity in synthetic and medicinal chemistry workflows. As an amino acid building block with a free amino acid functionality (or amino acid salt form, depending on supplier packaging), it is commonly used to introduce a sterically and electronically modified phenylalanine motif into peptide-like structures, peptidomimetics, and small-molecule scaffolds. The dichloro substitution pattern also makes it a useful intermediate for further functionalization of the aryl ring during analogue generation and structure-activity relationship studies.
1. Peptidomimetic Building Blocks
2,5-Dichloro-DL-Phenylalanine is used by medicinal chemistry and chemical biology groups to construct peptidomimetic and amino-acid-derived scaffolds where a halogenated phenylalanine motif is required for conformational, electronic, or binding-site interaction tuning. Researchers typically incorporate this building block into solution-phase or solid-supported fragment assembly strategies to generate analog libraries that retain the amino acid backbone while varying the aryl substitution pattern. The 2,5-dichloro substitution provides a convenient handle for later aromatic derivatization, enabling systematic SAR work around halogen effects and aryl electronics without changing the amino acid core.
2. Pharmaceutical Intermediate Synthesis
2,5-Dichloro-DL-Phenylalanine serves as a practical pharmaceutical intermediate for downstream synthesis of halogenated aryl-containing intermediates, including aryl-functionalized analogs and protected amino acid derivatives used in stepwise route development. Process and R&D chemists value the defined amino acid framework because it can be carried through multi-step sequences while maintaining the stereochemical and functional-group integrity required for later coupling or conversion steps. The dichloro aromatic ring pattern is particularly useful when the target route depends on aryl reactivity control, such as preparing substituted phenyl intermediates for medicinal chemistry programs and specialty chemical manufacturing.
3. Structure-Activity Relationship Analogues
2,5-Dichloro-DL-Phenylalanine is frequently selected for SAR analogue generation in research organizations developing small-molecule or peptide-like inhibitors and ligands that incorporate substituted aromatic amino acid elements. By using the racemic DL form, teams can efficiently access a broader set of analogs early in discovery workflows, then refine stereochemistry later if needed based on assay outcomes and structure-based design. The 2,5-dichloro pattern supports systematic exploration of how halogen placement changes physicochemical properties and interaction profiles, while the amino acid functionality enables straightforward conversion into coupling-ready formats for analogue synthesis.
4. Halogenated Aromatic Functionalization
2,5-Dichloro-DL-Phenylalanine is also used as an aryl-functionalization precursor when further modification of the aromatic ring is required to access additional substituted derivatives. Synthetic chemists leverage the two chlorine substituents as directing elements for later transformations that install new substituents on the phenyl ring while preserving the amino acid backbone for integration into larger molecules. This makes the compound valuable for building diversified intermediate sets in parallel synthesis campaigns, where maintaining a consistent amino acid core while varying aryl substitution is essential for efficient discovery and development chemistry.
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