Bz-D-Thr-OMe

Bz-D-Thr-OMe is a chiral, protected threonine methyl ester bearing a benzyl (Bz) amide on the amino terminus, with the D-stereocenter retained at the threonine α-carbon and a side-chain hydroxyl group positioned for selective functional-group manipulation. The molecule contains an amide carbonyl linked to the benzyl-protected nitrogen, a methyl ester at the carboxyl terminus, and a free secondary alcohol that can participate in derivatization, hydrogen-bonding interactions, and orthogonal protection strategies. The combination of N-acyl protection and esterification supports controlled peptide coupling chemistry after conversion to the corresponding activated carboxyl form, while the benzyl amide can be managed through standard deprotection logic depending on the downstream sequence. As a chiral amino acid ester intermediate, Bz-D-Thr-OMe can be used to build D-configured peptide segments and to generate stereochemically defined threonine derivatives for biochemical and synthetic organic workflows.

1. Peptide Synthesis

Bz-D-Thr-OMe is applied in peptide building workflows where D-threonine residues must be incorporated with defined stereochemistry and a protected amino functionality. The benzyl amide (Bz) stabilizes the nitrogen during coupling steps, while the methyl ester at the C-terminus can be converted into a carboxyl activation state for amide bond formation. The side-chain hydroxyl enables threonine-typical chemistry, including orthogonal protection prior to chain assembly or direct use in subsequent functionalization. Downstream, the resulting D-configured peptide fragments and threonine-containing analogs can be used for mapping sequence effects, generating peptide standards, and preparing stereodefined intermediates for longer constructs in peptide synthesis.

2. Side-Chain Functionalization

Bz-D-Thr-OMe is used for side-chain modification strategies that exploit the free threonine hydroxyl while keeping the amino and carboxyl functions masked as an N-acyl benzyl amide and a methyl ester. The secondary alcohol can be selectively protected, oxidized, or derivatized to introduce handles for further transformations, including formation of O-alkyl or O-acyl derivatives compatible with peptide chemistry. The D-configuration at the α-carbon supports stereochemically consistent downstream analog generation, which is important when comparing stereoisomer effects in amino acid derivatization studies. The hydroxyl-bearing threonine motif also serves as a functional element in peptidomimetic scaffolds and in synthetic routes that require predictable reactivity from an alcohol-bearing amino acid ester.

3. Chiral Amino Acid Intermediate

Bz-D-Thr-OMe functions as a chiral amino acid intermediate for stereocontrolled synthesis of D-threonine derivatives used across chemical manufacturing and research-grade fine chemical production. The preserved D-stereocenter, combined with the N-benzyl amide protection pattern and esterified carboxyl group, supports stepwise conversion into activated carboxylic acid forms or alternative protected amino acid formats. The methyl ester can be manipulated to access downstream carboxyl derivatives, while the benzyl-protected amide can be managed to align with orthogonal protection schemes used in multistep peptide and heterocycle syntheses. The resulting D-configured intermediates can be employed to prepare labeled or unlabeled amino acid building blocks, stereodefined peptide fragments, and other chiral threonine-containing structures that require reliable stereochemical integrity.

4. Chemical Biology Probes

Bz-D-Thr-OMe is suitable for chemical biology and biomolecular modification workflows that require D-threonine incorporation into peptide probes or labeling reagents. The molecule's threonine side-chain hydroxyl provides a chemically addressable site for installing linkers, affinity tags, or reporter-compatible substituents while maintaining an amide-linked backbone element for stable conjugate construction. The benzyl amide and methyl ester enable controlled intermediate handling during synthesis of probe precursors that can later be assembled into peptide conjugates or used as defined fragments in molecular recognition studies. Stereochemical control of the D-threonine unit supports consistent probe behavior in structure-activity relationship studies and in analytical research where stereochemistry influences binding and enzymatic processing.

5. Pharmaceutical Manufacturing Intermediates

Bz-D-Thr-OMe is applied in pharmaceutical intermediate preparation where protected amino acid esters are required to support scalable peptide fragment synthesis and downstream API-adjacent manufacturing routes. The N-protected benzyl amide and esterified carboxyl group align with common process chemistry strategies for minimizing side reactions during coupling and purification operations. The free threonine hydroxyl can be protected or transformed to match the protection/deprotection logic of the target peptide or peptidomimetic intermediate, enabling reproducible sequence assembly. The resulting D-threonine-containing intermediates can feed into controlled synthesis of peptide-based materials and stereochemically defined building blocks used in specialty chemical production and industrial fine chemical manufacturing.

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