Bzl-Ile-OH

Bzl-Ile-OH is a benzyl-protected isoleucine derivative in which the amino acid side chain of (2S,3S)-isoleucine is retained while the alpha-amino functionality is masked as a benzyl (Bzl) group, leaving a free carboxylic acid (OH) for controlled C-terminal chemistry. The stereogenic centers characteristic of isoleucine provide a defined chiral environment for peptide coupling and for stereoselective downstream transformations. The benzyl protection strategy introduces a stable N-substituent that can be removed under hydrogenolysis conditions, while the free acid enables activation for amide bond formation and incorporation into protected peptide sequences. The compound's amphiphilic character and functional group balance make it a practical chiral amino acid intermediate for peptide building block preparation and for synthetic organic routes requiring N-protected, C-acid amino acid handling.

1. Protected Amino Acid Chemistry

Bzl-Ile-OH supports protected amino acid synthesis workflows by combining an N-benzyl (Bzl) protecting group with an unmasked carboxylic acid for selective C-terminal activation. The isoleucine backbone stereochemistry and side-chain isobutyl motif provide a defined chiral residue that can participate in peptide coupling while maintaining side-chain integrity under standard amide-forming conditions. The free acid can be converted to activated derivatives for amide bond formation, whereas the N-benzyl group can be retained during chain assembly and later removed to expose the amine for subsequent coupling steps. Downstream use includes preparation of peptide building blocks and chiral intermediates where orthogonal control of N- and C-reactivity is required in amino acid derivative synthesis.

2. Peptide Synthesis

Bzl-Ile-OH is suitable for peptide synthesis as a chiral, N-protected amino acid building block with a free C-terminus for incorporation into growing peptide chains. The benzyl-protected amine suppresses undesired self-condensation and enables predictable coupling chemistry at the carboxyl group, while the (2S,3S) stereochemical configuration of isoleucine preserves residue geometry important for peptide conformational outcomes. The N-benzyl group can be carried through multiple coupling steps, supporting iterative assembly of peptide sequences that require temporary amine masking. Resulting peptides and peptide fragments can be used for structure-activity relationship studies, peptide mapping, and synthetic optimization of residue-level effects in peptide science.

3. Side-Chain Functionalization

Bzl-Ile-OH can be applied to side-chain functionalization strategies that start from a stereodefined isoleucine scaffold while keeping the alpha-amino functionality protected. The aliphatic isobutyl side chain provides a handle for derivatization to introduce hydrophobicity modulation, branching pattern changes, or functional group installation through side-chain-selective chemistry. The retained benzyl protection helps maintain chemoselectivity by preventing amine participation during side-chain modification, while the free carboxylic acid supports downstream conversion to amide or ester derivatives for conjugation-ready intermediates. Functionalized isoleucine derivatives derived from Bzl-Ile-OH can feed peptidomimetic construction and molecular scaffold diversification in synthetic organic chemistry.

4. Chiral Intermediate Synthesis

Bzl-Ile-OH serves as a chiral amino acid intermediate for stereocontrolled synthesis of N-protected isoleucine derivatives used in fine chemical production and research-grade chemical manufacturing. The defined stereocenters enable consistent generation of downstream chiral amide and ester products, including intermediates for larger peptide fragments and chiral ligands. The N-benzyl protecting group provides a robust handle for protecting-group strategies during multi-step sequences, while the free carboxylic acid enables conversion to activated forms appropriate for industrially scalable coupling chemistries. Downstream derivatives can include protected amino acid esters, activated acids, and peptide coupling reagents that support process chemistry intermediate preparation.

5. Chemical Biology Labeling

Bzl-Ile-OH can be utilized in chemical biology research where residue-specific incorporation of an isoleucine unit into peptide or peptide-like constructs enables controlled labeling and biomolecular modification. The compound's N-protection and free carboxyl group allow it to be incorporated into peptide segments that later undergo deprotection to generate an amine for subsequent conjugation chemistry, depending on the labeling design. The stereochemically defined isoleucine residue can improve reproducibility of labeling constructs by maintaining consistent backbone and side-chain geometry. Resulting labeled peptides and peptide analogs can be employed in biochemical investigations that require defined chiral building blocks for molecular recognition studies and analytical reference material generation.

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