Cbz-4-tert-butyl-L-Phenylalanine is a protected amino acid derivative featuring a phenylalanine backbone bearing a 4-tert-butyl substituted phenyl side chain, classifiable as a substituted aromatic amino acid. The molecule contains a free amino acid functionality masked as a Cbz (benzyloxycarbonyl) carbamate on the α-amino group and a free carboxylic acid, with the stereochemistry specified as L at the α-carbon. In peptide synthesis workflows, this protected analogue serves as a stepwise coupling building block where the Cbz group helps control chemoselectivity of the amino functionality while the bulky tert-butyl substituent on the side chain can be used to modulate steric environment in peptide and protein structure-function studies.
CAT No: CP11308
Cbz-4-tert-butyl-L-Phenylalanine is an N-Cbz (benzyloxycarbonyl) protected L-phenylalanine derivative bearing a para-tert-butyl substituted phenyl side chain. The molecule contains a single stereogenic center at the alpha carbon, with the L-configuration preserved for stereochemically consistent peptide coupling chemistry. The Cbz carbamate masks the amino group for controlled acylation, while the side-chain aromatic ring with a bulky tert-butyl substituent modulates hydrophobicity, conformational preferences, and steric behavior during synthesis and subsequent transformations. The protected amine and carboxyl functionality present a practical intermediate profile for building peptide-like structures and for preparing chiral aromatic amino acid derivatives through standard protecting-group strategies and downstream deprotection.
1. Peptide Synthesis
Cbz-4-tert-butyl-L-Phenylalanine is used in peptide building workflows where an N-protected aromatic amino acid is required for reliable amide bond formation. The Cbz carbamate provides an orthogonal protection handle that can be removed under hydrogenolysis-compatible conditions, enabling stepwise N-terminal or internal residue incorporation. The alpha-amino acid stereocenter and carboxyl group support peptide coupling chemistry with activated carboxylic acids, while the para-tert-butyl phenyl side chain can increase hydrophobic character and influence local folding in peptide analogs. The resulting protected residue can be carried through iterative coupling cycles to generate peptides and peptidomimetics containing bulky hydrophobic aromatic motifs relevant to structure-function studies.
2. Side-Chain Functionalization
Cbz-4-tert-butyl-L-Phenylalanine serves as a chiral aromatic intermediate for side-chain modification strategies that target hydrophobic/aromatic pharmacophore tuning. The para-tert-butyl substituted phenyl ring provides a sterically defined scaffold that can be retained while the amino acid backbone participates in derivatization, allowing access to substituted phenylalanine analogs for SAR-oriented libraries. The N-Cbz group supports controlled functional group transformations on the backbone and can be maintained during coupling, then removed to expose the free amine for subsequent conjugation or further derivatization. Downstream, the compound can be converted into modified amino acid derivatives and peptide fragments that probe how bulky aromatic substituents affect binding recognition and molecular packing.
3. Peptidomimetics And SAR Studies
Cbz-4-tert-butyl-L-Phenylalanine is applied in peptidomimetic construction and structure-activity relationship studies where aromatic side-chain sterics and lipophilicity are key design variables. The protected amino acid format supports incorporation into peptide-like scaffolds while the para-tert-butyl group can act as a hydrophobic volume element to modulate receptor contacts and conformational ensembles. The stereochemically defined L-alpha center helps maintain consistent backbone geometry across analog series, supporting meaningful comparisons in SAR workflows. The Cbz-protected residue can be used to generate analog panels that evaluate how aromatic substitution patterns translate into changes in physicochemical properties and structure-dependent molecular recognition.
4. Protein Engineering
Cbz-4-tert-butyl-L-Phenylalanine is suitable for protein engineering and chemical protein modification schemes that require defined incorporation of non-native aromatic residues. The N-Cbz protected amino acid can function as a controlled building block for preparing modified peptide segments that later serve as ligation partners or as substrates in protein assembly workflows. The bulky tert-butyl substituted phenyl side chain provides a hydrophobic and sterically demanding element that can be used to probe packing, stability, and local microenvironment effects in engineered constructs. The protected backbone enables compatibility with synthetic peptide fragment generation, supporting downstream assembly into larger biomolecular architectures while preserving stereochemical integrity.
5. Pharmaceutical Manufacturing Intermediate
Cbz-4-tert-butyl-L-Phenylalanine is relevant to pharmaceutical intermediate preparation where protected amino acid building blocks are required for controlled synthesis of peptide-based or peptide-derived materials. The N-Cbz carbamate protection supports manufacturing-compatible protection/deprotection logic, allowing the amino functionality to remain masked during coupling and purification steps, then be unmasked when the next synthetic transformation requires it. The para-tert-butyl phenyl side chain can be leveraged to design hydrophobic aromatic motifs in drug candidate scaffolds or in processable peptide intermediates. The compound's defined stereochemistry and protected functional-group pattern make it a practical chiral intermediate for fine chemical synthesis routes that culminate in peptide fragments, analogs, or conjugation-ready derivatives.
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