H-DL-Ala-OBzl · p-tosylate

H-DL-Ala-OBzl · p-tosylate is a racemic alanine benzyl ester p-tosylate salt that combines an amino acid ester framework with a benzyl-protected carboxylate and a tosylate counterion for amine salt formation. The molecule contains a chiral center at the alanine alpha-carbon in DL form, providing equal access to both stereochemical configurations for stereochemical screening and non-stereospecific intermediate preparation. The benzyl ester (OBzl) can participate in standard peptide coupling workflows after appropriate activation or conversion to a carboxylate equivalent, while the tosylate counterion supports handling as a crystalline, isolable salt form. The resulting reactivity profile aligns with protected amino acid chemistry, enabling downstream transformations into peptide building blocks and chemically defined alanine derivatives for synthetic and analytical use.

1. Protected Amino Acid Synthesis

H-DL-Ala-OBzl · p-tosylate is applied in protected amino acid synthesis and intermediate preparation for peptide building block generation, where the benzyl ester and tosylate salt form guide orthogonal reactivity. The alanine backbone provides the alpha-amino and ester-protected carboxyl functionality needed for controlled conversion into coupling-ready carboxyl equivalents or for selective deprotection sequences. The racemic (DL) stereochemical composition can be leveraged in process chemistry intermediate design when stereochemical resolution is deferred to a later stage or when stereochemistry is not yet constrained. The benzyl ester can be carried through coupling and then removed under conditions compatible with other protecting groups, supporting stepwise construction of amino acid derivatives and peptidic scaffolds.

2. Peptide Coupling Chemistry

H-DL-Ala-OBzl · p-tosylate is suitable for peptide coupling chemistry as an alanine-based component where the ester-protected carboxyl group can be transformed into an activated acylating species for amide bond formation. The N-acyl-free alanine ester framework, maintained as a tosylate salt, supports reproducible handling and can reduce variability associated with free amine speciation during synthesis planning. The benzyl ester (OBzl) provides a protecting-group handle that can be selectively removed or converted depending on the coupling strategy, enabling C-terminal modification workflows. The DL stereochemistry enables parallel synthesis of alanine-containing peptide segments for structure-activity relationship studies, combinatorial peptide libraries, or method development where stereochemical assignment is performed at the peptide level.

3. Chiral Resolution Screening

H-DL-Ala-OBzl · p-tosylate supports chiral synthesis workflows in which racemic alanine derivatives are subjected to resolution or stereochemical enrichment strategies after ester and salt formation. The presence of a defined benzyl ester and a tosylate counterion provides a consistent chemical platform for evaluating chiral auxiliaries, resolving agents, or selective crystallization approaches without altering the core amino acid framework. The alpha-carbon stereocenter in DL form enables direct comparison of stereoisomer behavior during downstream transformations such as activation, coupling, and deprotection. The resulting stereochemically enriched alanine derivatives can then be used for stereodefined peptide analog construction, chiral intermediate supply, and stereochemical method validation in synthetic organic chemistry.

4. Chemical Biology Labeling

H-DL-Ala-OBzl · p-tosylate can be used in chemical biology labeling and biomolecule modification pipelines where alanine residues serve as minimal, chemically stable elements within peptides or peptide-like conjugates. The amino acid ester structure facilitates incorporation into short peptide tags, while the benzyl ester protecting group can be managed to align with conjugation steps that require controlled functional group availability. The tosylate salt form helps maintain a defined ionic state during derivatization planning, supporting reproducible coupling to electrophiles or further functionalization to generate defined linkers. Downstream products can be applied as building blocks for affinity probes, proteomics-oriented peptide standards, or chemically defined conjugates used to interrogate biomolecular interactions.

5. Pharmaceutical Intermediate Preparation

H-DL-Ala-OBzl · p-tosylate is relevant to pharmaceutical intermediate preparation and fine chemical synthesis where alanine-based, protected carboxylate intermediates are used to build controlled peptide fragments and peptidomimetic precursors. The benzyl ester provides a protecting-group strategy compatible with multi-step synthesis, allowing the carboxyl functionality to be masked during earlier transformations and then revealed or converted when assembling larger structures. The amino acid framework supports scalable process chemistry routes that require predictable functional group interconversions, including conversion to activated derivatives for sequential coupling. The racemic nature can be advantageous in early-stage manufacturing planning, where stereochemical specification may occur after fragment assembly or via later resolution steps, enabling flexible supply of peptide-building components.

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