N-Me-Ala-OtBu · HCl

N-Me-Ala-OtBu · HCl is a hydrochloride salt of an N-methyl alanine tert-butyl ester, presenting a chiral alanine backbone with a stereogenic center at the α-carbon and a tert-butyl ester protected carboxylate functionality. The N-methyl substitution reduces the availability of the amide-forming nitrogen for conventional peptide coupling while maintaining a secondary amine character under controlled conditions, and the salt form improves handling of the amino ester intermediate. The tert-butyl ester can undergo acid-promoted deprotection to reveal a carboxylic acid for subsequent peptide bond formation or for conversion to activated acid derivatives. The overall reactivity profile supports its use as a controlled stereochemical building block and as a downstream intermediate for generating N-methylated amino acid residues and peptidomimetic fragments.

1. Peptide Synthesis

N-Me-Ala-OtBu · HCl is used in peptide synthesis workflows where N-methyl alanine residues are required, particularly for constructing peptides with constrained backbone conformations that can modulate amide hydrogen-bonding patterns. The tert-butyl ester provides a protected C-terminus that can be deprotected to the corresponding carboxylic acid, enabling conversion to peptide-coupling activated species while preserving the α-stereochemistry. The N-methylated nitrogen supports incorporation into peptide chains through strategies that accommodate N-methyl amino acid chemistry, including coupling after appropriate activation and protection-state management. Downstream peptide analogs prepared from this intermediate can be used in structure-activity relationship studies and scaffold optimization efforts where N-methylation is a defined structural variable.

2. Peptidomimetics Construction

N-Me-Ala-OtBu · HCl is applied in peptidomimetic construction for generating N-methyl alanine fragments that function as conformationally restricted building blocks. The N-methyl group and the ester-protected carboxylate work together to control chemoselectivity during sequential assembly, allowing stepwise installation of functional groups while limiting undesired side reactions. Acid-triggered tert-butyl deprotection can provide a carboxylic acid handle for subsequent coupling to amines or for formation of derivatives such as Weinreb-type esters, activated acids, or amide-linked motifs. The resulting N-methylated residues can be incorporated into peptide-mimicking backbones used to probe molecular recognition and backbone-dependent properties in biochemical research.

3. Chiral Amino Acid Intermediate

N-Me-Ala-OtBu · HCl serves as a chiral amino acid intermediate for stereoselective synthesis of N-methyl alanine derivatives and related chiral fragments. The defined α-chiral center enables downstream creation of stereochemically consistent analogs, including C-terminal acids, activated carboxylic acids, and protected amino acid derivatives used in multistep fine chemical synthesis. The hydrochloride salt form can assist in handling and reproducible protection-state transitions when generating coupling-ready intermediates. The tert-butyl ester protection strategy supports orthogonal functional group management, enabling selective transformations that preserve stereochemical integrity across synthetic sequences.

4. Pharmaceutical Intermediate Preparation

N-Me-Ala-OtBu · HCl is suitable for pharmaceutical intermediate preparation where N-methylated amino acid units and ester-to-acid conversion are recurring steps in synthetic routes to peptide-like small molecules. The protected carboxylate enables controlled formation of activated carboxylic acid intermediates used for amide bond formation in medicinal chemistry programs. The N-methyl substitution provides a defined structural element present in many peptide-derived pharmacophores and can be carried through to final intermediates without requiring late-stage N-methyl introduction. The compound's salt form and ester protection can be integrated into process chemistry intermediate strategies that emphasize reproducible handling of amino acid derivatives.

5. Analytical Reference Standards

N-Me-Ala-OtBu · HCl can be employed in analytical research as a stereochemically defined reference material for method development involving amino acid ester and N-methyl amino acid chemistries. The combination of N-methyl substitution and tert-butyl ester functionality yields characteristic fragmentation and retention behavior in chromatographic and mass spectrometric workflows used to monitor protected amino acid synthesis and deprotection steps. The hydrochloride salt form can improve reproducibility in sample preparation for LC-MS or chiral analytical studies where salt-state effects influence ionization. The compound can also serve as a calibration or identity-check component when tracking N-methyl alanine incorporation into peptide building blocks and peptidomimetic intermediates.

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