Bz-DL-Met-OH

Bz-DL-Met-OH is the benzyl ester-protected, racemic methionine derivative in which the amino acid backbone is present as a benzyloxycarbonyl (Cbz/Bz) protected amine and a free carboxylic acid, giving a chiral amino acid intermediate with stereochemistry at the alpha carbon that is supplied as a DL mixture. The molecule contains a thioether side chain characteristic of methionine, enabling controlled oxidation-state chemistry and thioether-to-sulfoxide/sulfone transformations under appropriate conditions. The N-protecting group is compatible with standard peptide coupling workflows, while the free C-terminus supports formation of amide bonds and subsequent peptide-chain elongation. The combination of a protected amine, carboxylic acid functionality, and methionine sulfur functionality makes Bz-DL-Met-OH suitable for derivatization, peptide building block preparation, and downstream synthetic intermediate generation in both research and process-oriented settings.

1. Peptide Synthesis

Bz-DL-Met-OH is applied in peptide coupling chemistry where the benzyloxycarbonyl-protected amine participates as a protected residue and the free carboxylic acid enables activation and amide bond formation at the C-terminus. The methionine thioether side chain can be carried through coupling steps with minimal interference under many standard conditions, while selective oxidation can be performed later to introduce sulfoxide or sulfone character when designing methionine analogs. The racemic DL stereochemistry supports peptide library construction and method development where stereochemical uniformity is not required at the alpha center. The protected amino acid format also supports stepwise protection/deprotection strategies for assembling longer peptide sequences with controlled functional group presentation.

2. Peptidomimetics And SAR

Bz-DL-Met-OH is used in peptidomimetic and structure-activity relationship studies to introduce a methionine-derived side chain into synthetic scaffolds while maintaining an N-protected amino acid handle for iterative functionalization. The thioether sulfur can be transformed to oxidized analogs to modulate polarity, hydrogen-bond acceptor properties, and conformational preferences relevant to SAR workflows. The presence of a free carboxyl group supports conversion into amide, ester, or activated derivatives that can be integrated into analog series for binding studies and mechanistic investigations. The stereochemical DL mixture may be employed for screening-oriented synthesis where racemate handling and later stereochemical resolution or analog diversification are part of the design space.

3. Side-Chain Functionalization

Bz-DL-Met-OH is suitable for side-chain functionalization routes that exploit methionine sulfur reactivity, including controlled oxidation to sulfoxide or sulfones to generate functionalized amino acid derivatives. The benzyloxycarbonyl-protected amine helps preserve the nucleophilic nitrogen during sulfur oxidation or subsequent derivatization, enabling orthogonal functional group management. The free carboxylic acid can be used to form activated intermediates for further coupling, allowing sulfur-modified methionine analogs to be incorporated into larger molecules without losing the ability to build peptide-like linkages. Downstream utility includes preparation of chemically defined methionine variants for biochemical probes, material-reactive handles, or synthetic intermediate sets used in parallel synthesis.

4. Process Chemistry Intermediate

Bz-DL-Met-OH is employed as a process chemistry intermediate for manufacturing amino acid derivatives where a protected amino acid with a free acid is required for scalable coupling steps. The Cbz/Bz-protected amine and free carboxylic acid provide a predictable functional group pair for activation chemistry and subsequent amide formation, supporting robust route design in fine chemical synthesis. The racemic DL form can simplify procurement and inventory for supply chains that do not require enantiopure methionine stereochemistry at the intermediate stage. The methionine thioether side chain can be carried through manufacturing steps and converted downstream to oxidized sulfur states when specification calls for sulfoxide/sulfone-containing products.

5. Analytical Research Standards

Bz-DL-Met-OH can serve in analytical research as a reference material for method development and characterization of protected methionine derivatives, including monitoring of deprotection and sulfur oxidation state changes. The combination of a defined N-protecting group and a free carboxyl group supports LC-MS, HPLC, and derivatization-based assays that distinguish protected versus deprotected species. The DL stereochemistry can be leveraged when analytical methods require racemate behavior or when enantiomeric separation is not the primary objective. The thioether-to-oxidized sulfur functionality enables targeted generation of related standards for studying reaction progress, impurity profiles, and stability of methionine-containing intermediates.

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