H-Thr(Bzl)-OH · HCl

H-Thr(Bzl)-OH · HCl is a protected threonine building block presented as the hydrochloride salt, featuring the L-threonine backbone with a benzyl-protected side-chain hydroxyl (Thr(Bzl)) and a free carboxylic acid for downstream peptide coupling. The benzyl ether masks the primary alcohol reactivity while preserving the stereogenic center of threonine for stereochemically controlled synthesis. The HCl salt form improves handling of the amino function during protected amino acid chemistry and can influence salt formation equilibria in coupling and derivatization steps. The combination of a benzyl-protected side chain and an unprotected carboxylic acid makes the compound suitable for controlled N-protection strategies and for selective deprotection workflows that regenerate the native threonine hydroxyl functionality.

1. Protected Amino Acids

H-Thr(Bzl)-OH · HCl is applied in protected amino acid synthesis workflows where a benzyl-protected threonine side chain supports orthogonal functional group management. The benzyl ether on the threonine hydroxyl reduces undesired side reactions during peptide coupling chemistry while the free carboxylic acid enables conversion into activated acyl derivatives or ester intermediates. The hydrochloride salt form supports consistent amino functionality handling in chiral building block preparation and can be integrated into stepwise protection and activation sequences. Downstream, the compound can be used to generate peptide building blocks that maintain threonine stereochemistry while deferring side-chain unmasking to later stages of synthesis.

2. Peptide Synthesis

H-Thr(Bzl)-OH · HCl is suitable for peptide building block preparation in solid-phase or solution-phase peptide synthesis where threonine residues require controlled side-chain hydroxyl participation. The benzyl-protected side-chain oxygen allows threonine incorporation without competing hydroxyl acylation or side reactions, while the carboxylic acid functionality supports peptide coupling chemistry after activation. The preserved stereocenter of threonine enables stereochemically defined amide bond formation consistent with peptide stereochemical requirements. After peptide assembly, benzyl deprotection strategies can regenerate the native threonine hydroxyl for producing threonine-containing peptides and peptide analogs with defined functional group placement.

3. Side-Chain Functionalization

H-Thr(Bzl)-OH · HCl serves as a chiral precursor for side-chain functionalization strategies that require late-stage access to the threonine hydroxyl group. The benzyl ether provides a stable masking group during earlier synthetic steps, enabling orthogonal transformations of other functional handles that may be present in multi-component amino acid derivatives or complex scaffolds. The hydrochloride salt form supports reproducible handling during conversion to reactive intermediates used for derivatization planning. Selective deprotection can then expose the hydroxyl for downstream conjugation, phosphorylation-mimetic design, glycomimetic elaboration, or attachment of functional moieties in peptidomimetic and chemical biology constructs.

4. Chiral Building Block Development

H-Thr(Bzl)-OH · HCl is utilized as a chiral amino acid intermediate in asymmetric and stereochemical synthesis programs that require L-threonine configuration retention. The benzyl-protected hydroxyl reduces the impact of alcohol reactivity on coupling and activation steps, allowing the molecule to function as a reliable stereodefined building block. The free carboxylic acid supports conversion into acylating agents or protected acid derivatives used to assemble higher-order chiral frameworks. Downstream, the compound can feed into the preparation of threonine-containing fragments for SAR studies, fragment-based molecular design, and stereochemically controlled peptide analog construction.

5. Chemical Manufacturing Intermediates

H-Thr(Bzl)-OH · HCl is applicable in industrial fine chemical synthesis and process chemistry as a protected amino acid intermediate for manufacturing routes that require controlled deprotection timing. The benzyl ether protecting group can be managed to minimize side reactions during scale-up coupling and intermediate formation, while the hydrochloride salt form can improve operational stability during handling of the amino functionality. The unprotected carboxylic acid enables standardized activation chemistry toward peptide-grade intermediates and downstream derivatization. The resulting threonine-based intermediates can be directed toward manufacturing of protected peptide fragments, peptidomimetic scaffolds, and other amino acid derivative products where orthogonal protection and stereochemical integrity are process-critical.

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