Ac-L-Lys-OMe*HCl

Ac-L-Lys-OMe*HCl is an N-acetylated L-lysine methyl ester hydrochloride, providing a protected amino acid building block format where the alpha-amino group is capped (Ac) and the carboxyl group is esterified (OMe). The lysine side chain remains available for downstream functionalization, making this reagent useful for constructing lysine-containing peptide fragments and lysine-derived intermediates under conditions where a free carboxylic acid is not desired. The hydrochloride salt form supports handling and coupling workflows in peptide and intermediate synthesis.

1. Lysine-Containing Peptide Fragments

Ac-L-Lys-OMe*HCl is commonly used by custom peptide synthesis groups to prepare lysine-bearing segments where the lysine's side chain needs to be carried forward while the alpha-carboxyl functionality is masked as a methyl ester. The N-acetyl (Ac) group reduces reactivity at the alpha-amino position during sequential assembly steps, helping maintain chemoselectivity when building peptide fragments that will later be converted into longer sequences. This format is particularly relevant when downstream steps require controlled activation or transformation of the lysine side chain rather than manipulation of a free carboxylate.

2. Protected Lysine Intermediate Synthesis

Ac-L-Lys-OMe*HCl serves as a practical starting material for medicinal chemistry and pharmaceutical intermediate development teams that need lysine-derived scaffolds with the alpha-amino and carboxyl functions already masked. The methyl ester (OMe) allows ester-stable handling during derivatization of the lysine side chain, while the N-acetyl group provides a predictable protecting pattern for multi-step synthesis planning. In industrial and process R&D settings, this reagent format is often selected to streamline the preparation of lysine-functionalized intermediates used in library synthesis, side-chain modification campaigns, and route development where minimizing competing functional-group reactivity is important.

3. Side-Chain Functionalization Workflows

Ac-L-Lys-OMe*HCl is frequently employed in chemical biology and peptide chemistry workflows that require selective modification at the lysine side chain while keeping the backbone positions protected. Researchers use this building block to generate lysine derivatives for subsequent conjugation, tagging, or incorporation into larger constructs, leveraging the remaining side-chain functionality as the primary site for derivatization. The hydrochloride salt form supports consistent handling in synthesis and analytical workflows, which is valuable when preparing multiple lysine-modified analogs for screening, method development, or reference material generation.

4. Analytical Reference Material Preparation

Ac-L-Lys-OMe*HCl is also used for analytical method development and reference standard preparation in laboratories that monitor lysine-containing fragments or lysine-derivatized intermediates by LC-MS or related workflows. The defined, protected structure helps reduce ambiguity from mixed functional-group states that can occur with less controlled lysine reagents. By providing a stable, well-characterized lysine building block with masked alpha functionality, it supports reproducible calibration and verification of sample preparation steps in peptide fragment analysis and intermediate characterization.

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