Overview
4-Chlorophenylalanine is a chemically modified amino acid where a chlorine atom is introduced at the para position of phenylalanine's aromatic ring. This structural alteration enhances its utility in medicinal chemistry, particularly in designing enzyme inhibitors or receptor-targeting compounds. The compound exists as both L- and D-enantiomers, with the L-form being more biologically relevant in most applications. As a non-proteinogenic amino acid, it serves as a valuable tool in studying neurotransmitter systems, especially serotonin synthesis inhibition. Its introduction into peptide chains can significantly alter biological activity and stability, making it important for drug development.
Physical and Chemical Properties
The chlorine substitution at the 4-position increases the compound's lipophilicity compared to native phenylalanine, affecting its solubility profile and membrane permeability. The crystalline solid shows stability under normal conditions but may decompose at higher temperatures rather than melting cleanly. Spectroscopic characteristics include typical aromatic absorption in UV spectra and distinct NMR signals for the chlorinated phenyl ring. The compound's acidity (pKa) differs slightly from phenylalanine due to the electron-withdrawing chlorine, influencing its behavior in biochemical systems. Chiral separation methods are often required to obtain enantiomerically pure forms for research purposes.
Main Applications
In pharmaceutical manufacturing, 4-chlorophenylalanine functions as a key intermediate for producing serotonin synthesis inhibitors and other CNS-active compounds. Researchers utilize it to create modified peptides with enhanced metabolic stability or altered receptor binding profiles. The compound also finds use in agricultural chemistry for developing novel pesticides and in material science for synthesizing specialized polymers. In biochemical studies, it serves as a tool compound for investigating amino acid transport systems and enzyme specificity in various organisms.
Safety and Storage
As a laboratory chemical, 4-chlorophenylalanine requires standard precautions for organic compounds - avoid inhalation of dust and prevent skin/eye contact. While not extremely hazardous, prolonged exposure should be prevented using fume hoods and proper gloves (nitrile recommended). Long-term storage stability is best maintained in airtight containers under inert atmosphere at low temperatures, especially for optically active forms. Compatibility testing should precede mixing with oxidizing agents or strong acids/bases. Spills should be contained with absorbent materials and disposed according to local regulations for halogenated organic compounds.
B2B Procurement Guide
Pharmaceutical buyers should verify compliance with relevant pharmacopeia standards (USP/EP) when sourcing this material. Bulk quantities (kilogram scale) typically offer better pricing but require validation of stability data and impurity profiles. Technical specifications should clearly state: enantiomeric purity, chemical purity (HPLC assay), residual solvent levels, and microbiological status when applicable. Reliable suppliers provide certificates of analysis with batch-specific data and preferably have cGMP certification for drug substance production. Lead times for custom synthesis can range from 4-12 weeks depending on complexity and quantity.
Related Manufacturers
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