Bzl-His-OH

Bzl-His-OH is a benzyl-protected histidine derivative in which the imidazole-bearing amino acid core is present as the free amino acid with a benzyl (Bzl) protecting group on the α-amino functionality, yielding a chiral histidine-based intermediate. The molecule contains the stereogenic center characteristic of histidine, a side-chain imidazole that can participate in acid-base equilibria and metal coordination, and a carboxylic acid that supports peptide coupling and downstream functionalization. The benzyl-protected amine provides orthogonal protection behavior under hydrogenolysis conditions, enabling controlled deprotection during protected amino acid synthesis and peptide assembly. The combination of imidazole reactivity, carboxylic acid handling, and benzyl protection makes Bzl-His-OH suitable as a stereodefined building block for peptide chemistry and as a chiral precursor for functional histidine modifications.

1. Protected Amino Acid Synthesis

Bzl-His-OH is used in protected amino acid synthesis and chiral intermediate preparation where orthogonal N-protection is required for histidine chemistry. The benzyl-protected amino group allows conversion of the carboxylic acid into activated coupling derivatives while deferring imidazole participation, and the stereogenic α-carbon supports incorporation of the correct histidine configuration into longer sequences. The imidazole side chain can be preserved during N-protected handling and can later be engaged through selective protection, metal coordination, or derivatization strategies compatible with peptide workflows. The carboxylic acid functionality enables formation of peptide coupling reagents or ester intermediates, supporting stepwise assembly of protected amino acid derivatives and downstream synthetic targets.

2. Peptide Synthesis Coupling

Bzl-His-OH is applied in peptide synthesis as a histidine-containing building block for N-protected peptide coupling strategies. The carboxylic acid and benzyl-protected amine align with standard peptide construction logic, where activation of the acid and subsequent amide bond formation can incorporate histidine residues into peptide chains. The side-chain imidazole can influence coupling and purification behavior through protonation state control, and it can be managed by pH-dependent conditions during synthesis planning to maintain compatibility with coupling reagents. The benzyl group can be removed by hydrogenolysis when required for subsequent coupling steps or for generating deprotected peptide segments, supporting iterative construction of histidine-rich peptides and peptide fragments.

3. Chemical Biology Imidazole Probes

Bzl-His-OH is utilized in chemical biology research for constructing imidazole-bearing probes and histidine-mimetic fragments that exploit the side-chain's acid-base and coordination chemistry. The free carboxylic acid and N-benzyl protection provide handles for converting the molecule into conjugation-ready derivatives, such as activated esters or amide-forming intermediates that can be appended to biomolecule scaffolds. The imidazole moiety can be incorporated into molecular recognition motifs for metal-binding studies, enzyme active-site mimicry, or pH-responsive labeling designs where stereodefined histidine geometry matters. The benzyl-protected amine also supports controlled deprotection timing, enabling sequential assembly of labeled constructs and facilitating downstream purification and analytical characterization.

4. Peptidomimetics And SAR Studies

Bzl-His-OH is suitable for peptidomimetic construction and structure-activity relationship studies where histidine side-chain functionality is retained while backbone modifications are introduced. The preserved imidazole group supports incorporation into constrained analogs that can maintain key hydrogen-bonding or metal-interaction features relevant to binding studies. The benzyl-protected amino group and carboxylic acid enable conversion into amide-linked fragments, cyclization precursors, or side-chain functionalization intermediates that feed into analog libraries. The stereodefined α-amino acid framework supports consistent stereochemical presentation across analog series, supporting comparative SAR workflows that rely on controlled structural variation.

5. Fine Chemical Synthesis Intermediate

Bzl-His-OH is employed as a process chemistry intermediate and fine chemical synthesis precursor for manufacturing histidine-derived derivatives and specialized amino acid building blocks. The combination of a stable benzyl-protected amine and a carboxylic acid supports scalable conversion into activated species for downstream coupling steps in a controlled synthetic sequence. The imidazole side chain can be carried through intermediates with planned protection or controlled reaction conditions, enabling reliable formation of amide bonds and subsequent derivatization into functional histidine derivatives. The compound's defined stereochemistry and functional group set make it suitable for generating downstream intermediates used in specialty chemical production, including peptide fragment manufacturing and chiral amino acid derivative supply chains.

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