4-Trifluoromethyl-DL-Phenylalanine is a DL (racemic) phenylalanine derivative bearing a trifluoromethyl substituent at the 4-position of the aromatic side chain, classifying it as a non-natural, ring-substituted amino acid. The molecule contains both an amino group and a carboxyl group on the α-carbon, with the side chain providing a hydrophobic, strongly electron-withdrawing CF3 functionality that can influence aromatic interactions and chemical stability during peptide assembly. As a substituted amino acid building block, it is used in peptide synthesis and structure-activity studies to introduce the CF3-bearing aromatic residue into peptides or to support analytical method development and chemical biology experiments requiring a defined, fluorinated phenylalanine analogue.
CAT No: CP16803
4-Trifluoromethyl-DL-Phenylalanine is a DL (racemic) phenylalanine analog bearing a para-trifluoromethyl substituent on the aromatic ring, providing a strongly electron-withdrawing, metabolically stable CF3 motif. As a non-natural amino acid building block, it is commonly used in medicinal chemistry and peptidomimetic design where aromatic substitution patterns and fluorinated pharmacophore elements are used to tune physicochemical properties and structure-activity relationships. Its free amino acid functionality makes it a practical precursor for downstream coupling chemistry and for preparing defined standards in analytical workflows.
1. Peptidomimetic Building Blocks
4-Trifluoromethyl-DL-Phenylalanine is used to incorporate a CF3-substituted aromatic side chain into peptidomimetic scaffolds and short peptide-like structures developed for structure-activity relationship studies. Research groups in medicinal chemistry and chemical biology often select this building block to probe how para-CF3 substitution influences binding-site interactions and overall molecular properties while maintaining an amino acid-like geometry for controlled synthetic assembly. The racemic DL form is frequently chosen during early-stage library synthesis and SAR screening, where rapid generation of analogs is prioritized over stereochemical resolution.
2. Pharmaceutical Intermediate Development
4-Trifluoromethyl-DL-Phenylalanine serves as a practical intermediate in the synthesis of fluorinated drug candidates and advanced chemical entities where a CF3-bearing aromatic motif must be introduced with an amino acid handle for further functionalization. Process development and medicinal chemistry teams use this material to access downstream derivatives such as protected amino acid intermediates, activated coupling partners, or side-chain-functionalized analogs that can be assembled into larger fragments. The presence of the amino acid backbone supports integration into conventional intermediate workflows used for building complex, stereochemically defined or stereochemical-diverse compound series.
3. Synthesis of Fluorinated Analog Libraries
4-Trifluoromethyl-DL-Phenylalanine is widely applied in parallel synthesis strategies to generate fluorinated analog libraries for SAR and selectivity profiling, particularly when aromatic substitution patterns are varied systematically. Medicinal chemistry groups use the CF3-substituted phenylalanine core to create series of analogs that differ in electronic character and hydrophobicity while keeping the amino acid framework consistent across analogs. The DL configuration supports efficient library generation at the stage where relative trends across substitution patterns are being mapped prior to any later stereochemical optimization.
4. Analytical Reference and Method Development
4-Trifluoromethyl-DL-Phenylalanine is also used as a defined chemical reference material for analytical method development and characterization of fluorinated amino acid derivatives in LC workflows. Analytical chemists and pharmaceutical intermediate quality teams rely on well-characterized standards to confirm identity, retention behavior, and impurity profiles for CF3-containing building blocks and their downstream protected or coupled products. The inclusion of the CF3 aromatic motif provides a distinct chromatographic and mass spectrometric signature that supports robust method tuning for fluorinated compound classes.
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