Chloroac-DL-Phe-OH

Chloroac-DL-Phe-OH is a DL (racemic) phenylalanine derivative in which a chloroacetyl-type functionality is associated with the amino acid framework, providing a reactive electrophilic handle alongside the stereochemically mixed α-amino acid center and the carboxylic acid group. The molecule retains the phenyl side chain characteristic of phenylalanine, enabling hydrophobic and aromatic interactions in peptide-like scaffolds and derivatization routes. The presence of a chloroacetyl moiety supports nucleophile-mediated transformations such as substitution and subsequent linkage formation, while the free carboxylic acid can participate in standard amino acid coupling chemistry after activation. The overall structure functions as a chiral synthetic intermediate and peptide-chemistry precursor where racemic stereochemistry can be resolved downstream or carried through as a defined stereochemical variable.

1. Peptide Coupling Intermediate

Chloroac-DL-Phe-OH is applied in peptide synthesis workflows as an amino acid-based intermediate that can be converted into an activated carboxyl derivative for amide bond formation. The carboxylic acid functionality enables coupling chemistry to N-protected amino groups, while the phenylalanine side chain supports incorporation into peptide sequences and peptidomimetic fragments that require aromatic residue placement. The chloroacetyl-type electrophile can be retained for later functionalization steps or selectively transformed under controlled conditions to introduce additional connectivity. Racemic (DL) stereochemistry allows the compound to be used for generating libraries of stereochemical variants or for downstream chiral resolution strategies prior to final peptide assembly.

2. Chemical Biology Conjugation

Chloroac-DL-Phe-OH supports chemical biology and biomolecule labeling approaches through its electrophilic chloroacetyl functionality, which can undergo nucleophilic substitution with thiol-containing or amine-containing targets. The phenylalanine backbone provides an amino acid recognition element that can be used to build linker-bearing conjugates compatible with peptide-based probes and affinity reagents. The free carboxylic acid can be used to generate activated intermediates for coupling to carrier proteins, solid supports, or scaffold molecules, enabling construction of amino-acid-derived bioconjugates. Racemic stereochemistry can be acceptable for linker studies where the biological readout depends primarily on the conjugation chemistry and the aromatic side chain positioning.

3. Amino Acid Derivatization

Chloroac-DL-Phe-OH is suitable for amino acid derivatization and synthetic organic chemistry routes that require an electrophile-bearing phenylalanine building block. The chloroacetyl-type group provides a reactive handle for controlled transformation into thioether, amide, or other substituted derivatives, while the carboxylic acid supports formation of esters, amides, and activated coupling partners. The phenyl side chain can be exploited for hydrophobic tuning and for directing downstream scaffold assembly in peptidomimetic construction. DL stereochemistry enables systematic evaluation of stereochemical effects in derivative formation, including routes where chiral separation or stereoretentive conversion is introduced at a later stage.

4. Process Chemistry Intermediate

Chloroac-DL-Phe-OH can be employed as a manufacturing intermediate in fine chemical synthesis due to its clear functional group inventory: a carboxylic acid for activation and a chloroacetyl electrophile for subsequent derivatization. The amino acid framework enables compatibility with established industrial coupling paradigms that transform acids into activated derivatives for amide formation, supporting scalable intermediate-to-intermediate conversion. The aromatic phenylalanine side chain contributes to predictable reactivity patterns during purification and downstream functional group transformations. Racemic supply is often practical for process development where stereochemical specification is deferred to later steps, such as resolution or stereoselective conversion, aligning with industrial process chemistry intermediate strategies.

5. Analytical Standards And SAR Tools

Chloroac-DL-Phe-OH can be used to prepare analytical standards and structure-activity relationship (SAR) research tools for studies involving amino-acid-derived electrophiles and phenylalanine analogs. The combination of a phenylalanine side chain with a chloroacetyl electrophile generates derivatives that can be tracked by chromatographic and spectrometric methods after controlled conversion into more stable or tagged forms. The carboxylic acid group enables formation of reference compounds with defined linkers, supporting method development for detecting related amino acid derivatives in synthetic mixtures. DL stereochemistry supports comparative profiling across stereochemical variants when the analytical endpoint depends on functional group presence and derivatization behavior rather than a single enantiomer.

1. The effect of sex on immune responses to a homocitrullinated peptide in the DR4-transgenic mouse model of Rheumatoid Arthritis

2. cRGD-functionalized, DOX-conjugated, and 64Cu-labeled superparamagnetic iron oxide nanoparticles for targeted anticancer drug delivery and PET/MR imaging

3. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

4. Zeta-potential-changing nanoparticles conjugated with cell-penetrating peptides for enhanced transfection efficiency

5. Proinsulin C-peptide and insulin: Limited pattern similarities of interest in inter-peptide interactions but no C-peptide effect on insulin and IGF-1 receptor signaling