N-Benzyl-L-isoleucine methyl ester hydrochloride is a protected, esterified amino acid derivative in which L-isoleucine is converted to the methyl ester and the amino group is benzylated, yielding a benzyl-protected amino acid bearing an isoleucine side chain with a branched hydrophobic character. The molecule contains a benzyl-protected nitrogen, a methyl ester carboxyl group, and is present as a hydrochloride salt, which affects the protonation state of the amino functionality and can influence handling and coupling behavior in synthesis. As an amino acid ester hydrochloride, it is used as a building block for peptide and peptidomimetic assembly where the protected amino group and ester form support controlled stepwise transformations and allow incorporation of the isoleucine side chain into larger amide-containing structures.
CAT No: CP01214
N-Benzyl-L-isoleucine methyl ester hydrochloride is an L-isoleucine-derived amino acid methyl ester bearing an N-benzyl substituent and present as a hydrochloride salt, combining a chiral α-amino acid framework with a protected amine functionality. The methyl ester masks the carboxyl group as an ester handle for controlled peptide coupling and downstream transformations, while the benzyl group on nitrogen provides steric and chemical modulation during synthesis. The molecule's stereochemistry at the α-carbon follows the L-configuration, enabling stereospecific incorporation into peptide-like structures and chiral intermediate design. The hydrochloride salt form enhances handling of the amino ester by maintaining the amine in a protonated state, which can influence coupling selectivity and compatibility with typical protecting-group strategies.
1. Peptide Synthesis
N-Benzyl-L-isoleucine methyl ester hydrochloride supports peptide building block preparation where the methyl ester can be converted to an activated carboxyl derivative for amide bond formation under standard peptide coupling conditions. The N-benzyl group functions as an amine-protecting strategy that can be retained during coupling steps and later removed to reveal the free amine for sequential elongation or for generating defined N-termini. The L-isoleucine side chain provides a hydrophobic, stereochemically defined residue that is compatible with incorporation into peptides and peptide fragments. The resulting workflow enables construction of isoleucine-containing sequences and controlled generation of protected intermediates for iterative peptide assembly in both academic and process chemistry settings.
2. Side-Chain Functionalization
N-Benzyl-L-isoleucine methyl ester hydrochloride is suitable for side-chain derivatization workflows that exploit the isoleucine scaffold while maintaining orthogonal protection at the α-amino position. The ester functionality enables selective transformations toward carboxylate-containing intermediates, while the N-benzyl group can be used to prevent undesired amide formation or side reactions during side-chain modification steps. The chiral, branched aliphatic side chain can be carried through functionalization sequences to generate stereodefined analogs for structure-activity relationship studies and synthetic library construction. Downstream conversion of the ester and controlled deprotection of the amine can yield amino acid derivatives that serve as intermediates for further medicinal chemistry and fine chemical synthesis.
3. Chiral Building Block Development
N-Benzyl-L-isoleucine methyl ester hydrochloride functions as a chiral amino acid intermediate for asymmetric and stereocontrolled synthesis, where the L-configuration at the α-carbon is preserved through ester and N-protection strategies. The hydrochloride salt form provides a practical chiral precursor for handling and for tuning reactivity of the amino ester during conversion to carboxyl-activated species. The N-benzyl protection pattern can be leveraged for orthogonal deprotection logic, enabling sequential liberation of functional groups in multi-step routes. The compound's defined stereochemistry and protected functional groups make it compatible with downstream synthesis of chiral amide motifs and peptide-like chiral fragments used in research-grade molecular design.
4. Bioconjugation Chemistry
N-Benzyl-L-isoleucine methyl ester hydrochloride can be employed in bioconjugation and chemical biology workflows where a protected amino acid derivative is converted into a defined coupling partner. The methyl ester and N-protected amine allow controlled generation of reactive carboxyl or amide-forming intermediates while minimizing premature reaction with nucleophiles during conjugation setup. The isoleucine residue contributes a hydrophobic segment that can influence solubility and local microenvironment in conjugated biomolecule constructs. Controlled deprotection and functional group interconversion can provide amino acid-based handles for attaching peptide fragments, linker-bearing moieties, or stereochemically defined tags used in biomolecule modification studies.
5. Pharmaceutical Intermediate Preparation
N-Benzyl-L-isoleucine methyl ester hydrochloride is applicable to pharmaceutical intermediate preparation where protected amino acid esters serve as feedstocks for building amide-containing scaffolds. The N-benzyl protection strategy supports selective transformations of the carboxyl functionality, enabling conversion from ester form to activated derivatives used in synthetic routes toward peptide mimetics and small-molecule amide motifs. The L-isoleucine stereocenter provides stereochemical control that can be carried into final intermediates used for medicinal chemistry programs and process-scale fine chemical synthesis. The hydrochloride salt form can also support reproducible handling in manufacturing-oriented workflows that require stable, isolable chiral amino acid derivatives for downstream coupling chemistry.
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