N-α-Methyl-DL-alanine is a substituted amino acid derivative in which the α-amino acid framework bears an N-methyl substituent, featuring an amino group and a carboxyl group with a side chain of the alanine type (methyl). The "DL" designation indicates a racemic mixture at the α-carbon, and the N-α-methyl substitution reduces the availability of the α-amino hydrogen for acylation while maintaining the carboxyl functionality for salt formation or coupling chemistry. In peptide and amino acid chemistry, this compound is used as a building block to introduce N-methylated alanine residues for structure-activity studies, conformational analysis, and the preparation of modified peptides and related intermediates where N-methyl substitution is used to tune backbone properties.
CAT No: CP00137
N-α-Methyl-DL-alanine is an alanine derivative in which the α-carbon bears an additional methyl substituent, producing a chiral, sterically encumbered amino acid framework with a free carboxylic acid and a primary amine. The DL designation indicates a racemic mixture of the D- and L-α-methyl stereoisomers, enabling method development and stereochemical screening without committing to a single configuration. The extra α-methyl group increases conformational bias and can modulate reactivity during peptide coupling, while the amino and carboxyl functionalities support standard amino acid transformations such as esterification, amide formation, and temporary protection. As an amino acid intermediate, N-α-methyl-DL-alanine can be converted into protected building blocks or activated derivatives for downstream synthesis of substituted amino acid motifs and peptide analogs.
1. Peptide Coupling Chemistry
N-α-Methyl-DL-alanine is applied in peptide coupling chemistry where α-methyl substitution influences amide bond formation and the steric environment around the reacting nitrogen and carbonyl. The amino acid's free amine and carboxylic acid can be transformed into N-protected, C-activated forms compatible with common peptide coupling strategies, supporting incorporation into short peptide sequences and peptidomimetic scaffolds. The racemic stereochemical composition can be used to probe how α-methyl stereocenters affect coupling outcomes and conformational preferences in resulting amide chains. Downstream, the resulting peptide fragments can serve as intermediates for SAR-focused analog libraries and synthetic method comparisons in amino acid chemistry.
2. Unnatural Amino Acid Building Blocks
N-α-Methyl-DL-alanine is suitable for constructing unnatural amino acid building blocks used in peptidomimetics and backbone-modified peptide design. The α-methyl stereocenter introduces a constrained backbone motif that can be retained through protection-group strategies and selective deprotection to generate defined substituted alanine residues within larger constructs. The amino acid functionality supports conversion to protected derivatives for stepwise assembly, while the carboxyl group enables formation of peptide bonds or further derivatization into amide-linked intermediates. The racemic starting material can be employed for rapid synthesis of mixed stereoisomer series, which may then be separated or carried forward into downstream studies requiring stereochemical diversity.
3. Chiral Resolution Screening
N-α-Methyl-DL-alanine is used in chiral synthesis workflows where racemic amino acid intermediates are screened for resolution, derivatization, or stereoselective transformation. The presence of both an amino group and a carboxyl group enables formation of diastereomeric salts or derivatives with chiral reagents, allowing analytical monitoring by chiral chromatography or NMR methods. The α-methyl substitution creates stereochemical differentiation that can improve the detectability of enantiomeric behavior during resolution steps. Resulting enantiomerically enriched fractions can then be converted into protected amino acid derivatives for stereochemically controlled peptide construction and chiral intermediate supply.
4. Side-Chain Functionalization Routes
N-α-Methyl-DL-alanine is relevant to synthetic organic chemistry routes that require a substituted alanine motif for downstream functional group installation. The amino acid's primary amine can be protected and later functionalized, while the carboxyl group can be activated for coupling to nucleophiles or for conversion into esters and amides used in intermediate elaboration. α-Methyl substitution can affect reactivity and selectivity during subsequent transformations, including derivatization steps that build substituted amide or ester linkages. The compound therefore functions as a practical chiral amino acid precursor for generating functionalized derivatives used in fine chemical synthesis and peptide analog manufacturing.
5. Pharmaceutical Intermediate Preparation
N-α-Methyl-DL-alanine is utilized in pharmaceutical intermediate preparation where backbone-modified amino acid fragments are incorporated into larger synthetic sequences. The amino acid's bifunctional nature supports conversion into protected amino acid derivatives and activated intermediates that can be carried into multi-step syntheses targeting amide-rich structures and constrained peptide-like motifs. The racemic mixture can serve as a starting point for process development, including route scouting for protecting-group compatibility, activation chemistry, and downstream stereochemical handling. Subsequent intermediates derived from N-α-methyl-DL-alanine can be applied in the manufacture of research-grade peptidomimetic building blocks and related functional molecules.
6. Analytical Standards And Method Development
N-α-Methyl-DL-alanine is applied in analytical research and method development as a reference amino acid derivative for monitoring derivatization, activation, and stereochemical behavior of α-methyl substituted amino acids. The compound's defined structure with a single α-methyl stereogenic center supports calibration of chromatographic and spectroscopic methods used to quantify amino acid derivatives, protected intermediates, and stereoisomer distributions. The free functional groups enable preparation of derivatized standards or internal references that reflect how α-methyl substitution influences retention and detection. Analytical workflows using this intermediate can support quality control of amino acid derivatization steps and improve interpretability of peptide synthesis and stereochemistry screening data.
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