H-Lys(isopropyl)-OH is a free, lysine-derived amino acid featuring an isopropyl-substituted side chain on the ε-position while retaining the α-amino and α-carboxyl functional groups. The molecule exists as an unprotected amino acid with a primary α-amine and a carboxylic acid, and the Nε-isopropyl substitution replaces the native lysine terminal primary amine with a hydrocarbon-bearing substituent. It is used in peptide chemistry and structure-activity or chemical biology studies where a lysine scaffold with altered side-chain polarity and hydrogen-bonding capacity is required, including the preparation of modified amino acid building blocks and analytical standards.
Lysine isopropyl ester hydrochloride, H-Lys(isopropyl)-OH, is a chiral lysine derivative in which the side-chain ε-amino group is protected as an isopropyl carbamate while the α-carboxylic acid remains present for subsequent functionalization. The molecule retains the canonical lysine stereocenter configuration at the α-carbon, providing a defined geometry for peptide coupling and stereochemically consistent incorporation into peptide sequences. The protected ε-amine reduces undesired side reactions during acylation or coupling chemistry, while the free α-carboxyl group enables conversion to activated ester or amide-forming derivatives. The overall reactivity profile supports controlled deprotection and downstream transformations that are characteristic of protected amino acid intermediates used in both peptide synthesis and industrial fine chemical routes.
1. Protected Amino Acids
H-Lys(isopropyl)-OH is applied in protected amino acid synthesis workflows where side-chain ε-amino protection is required to maintain chemoselectivity during peptide coupling. The isopropyl-protected lysine side chain suppresses uncontrolled N-acylation at the ε-position while the α-carboxylic acid supports conversion to coupling-ready forms for N-terminal or internal residue formation. Deprotection strategies can be selected to reveal the lysine ε-amine after chain assembly, enabling subsequent functionalization steps such as acylation, alkylation, or orthogonal protection. The resulting lysine building block behavior aligns with peptide science needs for controlled reactivity and stereochemically defined amino acid incorporation.
2. Peptide Synthesis
H-Lys(isopropyl)-OH is suitable for peptide building block preparation in solid-phase or solution-phase peptide synthesis where lysine residues must be introduced with controlled side-chain chemistry. The molecule's α-carboxyl functionality and protected ε-amino group enable peptide coupling at the backbone while preventing premature side-chain participation that can lead to branching or cross-linking. Orthogonal deprotection of the isopropyl-protected ε-amine after chain elongation can facilitate selective formation of lysine-containing motifs, including amide-linked side chains or further derivatization for charge modulation. Downstream peptide analog construction benefits from the defined lysine stereochemistry, supporting reproducible assembly of sequence-specific structures used in biochemical research and synthetic methodology development.
3. Bioconjugation Chemistry
H-Lys(isopropyl)-OH can be employed in bioconjugation chemistry as a protected lysine precursor for generating handle-bearing conjugates after controlled deprotection and derivatization. The protected ε-amino group serves as a latent nucleophile that can be unveiled to enable amide coupling, reductive amination, or linkage formation to biomolecule scaffolds under conditions that minimize side reactions. The free α-carboxyl group allows preparation of lysine-based intermediates that can be transformed into activated species for conjugate assembly, including incorporation into peptide carriers or linker constructs. The chiral lysine backbone supports construction of well-defined conjugation reagents for chemical biology studies requiring consistent spatial presentation of the lysine functional group.
4. Process Chemistry Intermediate
H-Lys(isopropyl)-OH is relevant to process chemistry intermediate preparation for industrial fine chemical synthesis routes that require stable, isolable amino acid derivatives with controlled functional-group reactivity. The isopropyl-protected ε-amine can be handled under conditions that favor α-carboxyl activation and coupling chemistry without extensive side-chain modification, improving route predictability in multi-step manufacturing. The defined stereocenter at lysine supports downstream formation of stereochemically consistent peptide building blocks and lysine-containing intermediates used in larger synthetic sequences. The compound's protected amino acid character makes it suitable for scalable intermediate manufacturing where protecting-group stability and subsequent deprotection selectivity are central to process design.
5. Analytical Research Standards
H-Lys(isopropyl)-OH can serve in analytical research as a reference material for method development targeting lysine-containing peptides, amino acid derivatives, and protected amino acid fragments. The combination of an α-carboxylic acid and a protected ε-amino group provides characteristic ionization behavior and fragmentation patterns that can be used to validate LC-MS or MS/MS workflows for lysine residue identification. Controlled deprotection of the isopropyl-protected side chain can also generate predictable analyte forms for calibration of derivatization-dependent assays. The stereochemically defined lysine framework supports reproducible analytical comparisons across peptide synthesis batches and intermediate characterization studies.
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