H-D-Thr(tBu)-OMe*HCl

H-D-Thr(tBu)-OMe*HCl is an N-protected, side-chain protected threonine derivative presented as a hydrochloride salt, featuring a D-configured α-chiral center and a tert-butyl-protected side-chain hydroxyl that is stable under many peptide-coupling conditions. The methyl ester (OMe) at the carboxyl terminus provides a protected C-terminus that can be selectively transformed into an acid or activated derivative for downstream coupling. The combination of an N-acetyl (H-D- prefix) motif, the tBu ether, and the ester functionality yields a controlled reactivity profile in which amide bond formation and side-chain deprotection can be orchestrated through standard protecting-group strategies. The salt form improves handling of the amino ester while maintaining the stereochemical integrity required for chiral amino acid intermediate use in peptide building block preparation and stereoselective synthesis.

1. Peptide Synthesis

H-D-Thr(tBu)-OMe*HCl is applied in peptide synthesis workflows where a D-threonine building block with a protected side-chain hydroxyl is required to prevent undesired O-acylation during coupling. The methyl ester and N-protected amino group enable peptide coupling chemistry to form amide linkages while the tBu ether suppresses side-chain reactivity until a planned deprotection step. The D stereochemistry at the α-carbon supports incorporation of stereochemically defined residues for generating peptide analogs with controlled backbone recognition. The resulting peptide fragments can be further processed toward protected-to-free carboxyl conversion, enabling C-terminal modification and iterative chain assembly in synthetic peptide chemistry.

2. Amino Acid Derivatization

H-D-Thr(tBu)-OMe*HCl serves as a chiral amino acid ester intermediate for amino acid derivatization and functional group interconversion, leveraging the orthogonal protection pattern between the side-chain hydroxyl and the carboxyl ester. The tert-butyl-protected hydroxyl can be deprotected to reveal a primary alcohol handle for subsequent esterification, ether formation, or conjugation chemistry, while the methyl ester can be hydrolyzed or converted into activated carboxyl derivatives for further transformations. The hydrochloride salt form can facilitate handling and can support controlled reactivity when preparing downstream intermediates for fine chemical synthesis. The compound's stereochemical definition makes it suitable for generating D-threonine-containing derivatives used in structure-activity relationship studies and stereochemical mapping of amino acid functional groups.

3. Peptidomimetics And SAR

H-D-Thr(tBu)-OMe*HCl is utilized in peptidomimetic and SAR studies where D-threonine stereochemistry and side-chain hydroxyl positioning influence molecular recognition. The protected hydroxyl allows incorporation into scaffolds without premature side reactions, enabling later installation of functional substituents such as carbonate, phosphate, or other oxygen-linked groups after controlled deprotection. The amino ester format supports construction of constrained or modified peptide-like structures by enabling selective conversion of the carboxyl terminus to coupling-ready forms. The resulting D-threonine analogs can be used to probe structure-activity relationships through systematic variation of stereochemistry and side-chain functionalization patterns relevant to amino acid chemistry and peptide science.

4. Protein Engineering

H-D-Thr(tBu)-OMe*HCl can be employed in protein engineering and chemical protein modification strategies that require stereodefined threonine analogs for site-specific incorporation into peptide segments used in semi-synthetic or chemically assembled proteins. The protected side-chain hydroxyl helps maintain chemoselectivity during assembly of peptide fragments that later undergo deprotection to yield a functional alcohol for further derivatization. The N-protected amino ester structure supports controlled fragment coupling and subsequent processing to generate defined peptide termini compatible with ligation or conjugation workflows. D-threonine-containing constructs derived from this intermediate can support studies of stereochemical effects on protein-ligand interactions, phosphorylation-mimic design, or stability-focused scaffold engineering in applied biochemical research.

5. Pharmaceutical Manufacturing Intermediates

H-D-Thr(tBu)-OMe*HCl is relevant to pharmaceutical manufacturing intermediate preparation where protected amino acid building blocks are required for controlled synthesis of peptide-based or peptidomimetic intermediates. The orthogonal protection set, including the tBu ether for side-chain hydroxyl and the methyl ester for the carboxyl terminus, supports manufacturing-oriented route design that separates coupling steps from later functional group unveiling. The hydrochloride salt form can improve material handling for scale-up operations that require consistent solid-state properties during intermediate preparation. Downstream conversion of the ester to carboxylic acid derivatives and deprotection of the side-chain hydroxyl enable generation of coupling-ready intermediates for further assembly into larger synthetic targets used in industrial fine chemical synthesis and applied process chemistry.

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