N-Me-Orn-OH · HCl

N-Me-Orn-OH · HCl is a hydrochloride salt of an N-methylated ornithine amino acid, providing a chiral amino acid framework with a side-chain containing a terminal primary amine and a carboxylic acid. The N-methyl substitution on the α-amino group reduces primary amine reactivity and modulates peptide coupling behavior, while the free carboxyl functionality supports salt formation and controlled activation for amide bond formation. The presence of the side-chain primary amine enables selective derivatization, including orthogonal protection strategies that can be tuned for stepwise synthesis. As a chiral amino acid intermediate, it can be converted into protected amino acid derivatives or activated forms suitable for peptide building block preparation and downstream synthetic transformations.

1. Protected Amino Acids

N-Me-Orn-OH · HCl is used in protected amino acid synthesis where the α-carboxylic acid and side-chain primary amine can be managed through orthogonal protection and activation sequences. N-methylation changes the α-amino nucleophilicity relative to unmodified ornithine, which can support controlled peptide coupling after conversion to an activated carboxyl derivative. Side-chain amine protection strategies such as Boc, Cbz, or other orthogonal groups can enable sequential deprotection to expose specific functionalities for later coupling steps. The resulting protected intermediates can serve as N-methyl ornithine building blocks for peptide analog preparation and for assembling amino acid rich scaffolds in fine chemical synthesis.

2. Peptide Synthesis

N-Me-Orn-OH · HCl is applied in peptide synthesis as an amino acid building block that introduces an N-methylated ornithine residue into peptide chains. The α-carboxyl group can be activated for amide bond formation, while the N-methylated α-amino functionality participates in coupling chemistry with reduced propensity for side reactions associated with free primary α-amines. The side-chain primary amine can be protected to prevent crosslinking during chain assembly, enabling selective formation of peptide bonds without premature intramolecular reactions. Incorporation of this residue can support the construction of polyamine-containing peptides, cyclic peptide precursors, and peptidomimetic frameworks where controlled side-chain functionality is required for subsequent conjugation or cyclization.

3. Bioconjugation Chemistry

N-Me-Orn-OH · HCl is suitable for bioconjugation workflows that rely on a defined amino acid-derived handle for amide formation and subsequent attachment chemistry. The terminal side-chain primary amine enables formation of stable linkages to activated carboxylates, activated esters, or carboxyl-activated biomolecule scaffolds after appropriate protection/deprotection management. The hydrochloride salt form can be leveraged to control protonation state during derivatization planning, improving reproducibility of functional group availability. Downstream conjugates can be used as labeled peptide standards, linker-bearing intermediates for biomolecule modification, and amino acid-based coupling components in chemical biology research.

4. Peptidomimetics And SAR

N-Me-Orn-OH · HCl supports peptidomimetic construction for structure-activity relationship studies by enabling incorporation of an N-methylated ornithine motif that can influence conformational preferences and hydrogen-bonding patterns. The N-methyl group on the α-amino position can modulate amide NH availability, while the side-chain primary amine provides a tunable basic center for receptor interaction mapping. Side-chain derivatization after peptide assembly, including conversion to protected amines or further functional group transformations, can generate libraries of analogs with controlled polarity and charge distribution. The compound therefore functions as a practical amino acid intermediate for generating analog series used in SAR-focused molecular design and synthetic methodology development.

5. Process Chemistry Intermediate

N-Me-Orn-OH · HCl is employed as a chiral amino acid intermediate in process chemistry intermediate preparation where salt handling and functional group control are central to scalable synthesis. The carboxylic acid and terminal amine enable straightforward conversion into activated derivatives or protected intermediates that can be carried through multi-step manufacturing routes. N-methylation can reduce undesired amine-based side reactions during protection, activation, and coupling steps, supporting more predictable downstream transformations in peptide building block manufacture. The side-chain primary amine provides a reactive locus for controlled derivatization into protected or activated forms that can be used to produce industrial quantities of amino acid derivatives for specialty chemical production and peptide-manufacturing supply chains.

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