N-Me-D-Ala-OtBu · HCl

N-Me-D-Ala-OtBu · HCl is a hydrochloride salt of an N-methyl protected D-alanine tert-butyl ester, combining a chiral D-amino acid framework with an N-methylated amide-forming nitrogen and a C-terminal tert-butyl ester that can be selectively handled under acid/base conditions. The molecule contains a stereodefined α-carbon (D-configuration), a carboxylate masked as an OtBu ester, and an N-methyl substituent that modulates peptide coupling reactivity and conformational behavior in short peptide segments. Hydrochloride salt formation increases handling stability by protonating basic sites, supporting consistent downstream transformations in peptide chemistry workflows. The protected amino acid derivative structure is well-suited for controlled deprotection and for incorporation into peptide-like sequences where stereochemistry and terminal functionality are critical.

1. Peptide Synthesis

N-Me-D-Ala-OtBu · HCl supports peptide building block preparation for solid-phase or solution-phase assembly where D-alanine stereochemistry is required to tune backbone geometry and protease resistance profiles. The N-methylated nitrogen and the C-terminal OtBu ester provide a protection strategy that can be managed through orthogonal deprotection steps, enabling selective unveiling of coupling-ready functionality while maintaining the chiral center. The tert-butyl ester can be converted to a carboxylate under acid-mediated conditions, and the N-methyl group can influence amide bond formation kinetics and the resulting peptide conformation. Downstream use focuses on generating D-Ala-containing peptides and peptidomimetic fragments for structure-activity relationship studies and peptide scaffold optimization.

2. Chiral Building Blocks

N-Me-D-Ala-OtBu · HCl functions as a stereochemically defined chiral amino acid intermediate for asymmetric peptide design and stereocontrolled fragment construction. The D-configuration at the α-carbon provides a precise stereochemical handle for building chiral sequences that incorporate unnatural stereochemical patterns relative to L-amino acid templates. The protected ester and N-methyl substitution allow controlled reactivity during coupling, enabling chemists to manage side reactions that can arise from free carboxylic acids or unprotected amines. The hydrochloride form further supports reproducible handling during intermediate preparation, enabling consistent downstream synthesis of chiral amino acid derivatives and peptide analogs.

3. Amino Acid Derivatization

N-Me-D-Ala-OtBu · HCl is suitable for amino acid derivatization routes that leverage the protected functional groups to install or transform terminal and backbone-adjacent chemistry. The OtBu ester can be selectively removed to generate a carboxylic acid for subsequent activation to acylating agents, while the N-methyl group maintains an amide-compatible nitrogen environment that can be retained or further modified depending on the synthetic plan. The hydrochloride salt can be used to manage protonation states during derivatization, supporting controlled formation of reactive intermediates such as activated carboxyl derivatives. Resulting products can include acylated fragments, peptide coupling partners, and functionalized D-alanine derivatives used in synthetic organic chemistry and biochemical research intermediate preparation.

4. Peptidomimetics And SAR

N-Me-D-Ala-OtBu · HCl can be incorporated into peptidomimetic construction where backbone stereochemistry and N-substitution patterns are used to modulate conformational preferences and molecular recognition. The N-methyl substitution and D-alanine stereocenter together influence amide orientation and local steric environment, which can be leveraged when assembling short constrained motifs or SAR-focused analog libraries. The protected ester enables stepwise assembly into larger constructs while preventing premature hydrolysis or unwanted coupling. Downstream utility includes generating D-Ala-containing analogs for structure-activity relationship studies, fragment screening sets, and mechanistic probes that rely on controlled stereochemical presentation.

5. Pharmaceutical Manufacturing Intermediates

N-Me-D-Ala-OtBu · HCl serves as a process-relevant amino acid intermediate for manufacturing workflows that require protected chiral building blocks with predictable deprotection and coupling behavior. The OtBu ester protection strategy aligns with industrially common acid-mediated deprotection logic, while the N-methyl functionality provides a defined substitution pattern for downstream acylation steps and peptide-like intermediate formation. Hydrochloride salt handling can support consistent material transfer and reproducibility during batch synthesis by stabilizing protonation states of the amino acid derivative. The resulting intermediates can feed into fine chemical synthesis of peptide fragments, peptidomimetic intermediates, and stereochemically controlled sequences used in applied product development and industrial chemical manufacturing.

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