L-cysteine n-amylester hydrochloride is a cysteine-derived amino acid ester in which the carboxyl group of L-cysteine is converted to an n-amyl ester while the amino functionality remains present, and the molecule bears the characteristic thiol-containing side chain of cysteine. The hydrochloride form indicates protonation and counterion association for the basic amino group, and the esterification removes the free carboxyl group, altering hydrogen-bonding and solubility relative to the corresponding free amino acid. This compound is used as an amino acid ester building block and substrate in peptide and amide synthesis workflows where controlled handling of the carboxyl functionality and the cysteine thiol side chain are required, including preparation of cysteine-containing intermediates for chemical ligation, labeling, or structure-activity studies.
CAT No: CP00649
L-cysteine n-amylester hydrochloride contains the L-cysteine amino acid framework with a thioether side chain and a C-terminal n-amyl ester, present as the hydrochloride salt to support handling and controlled reactivity. The stereogenic center of the L-amino acid backbone defines consistent chirality for downstream peptide coupling and for stereochemical integrity during derivatization. The ester functionality enables reversible C-terminal activation strategies, while the cysteine thioether can be selectively oxidized or transformed for thiol-based conjugation workflows after appropriate functional group conversion. The salt form and ester group together influence solubility and compatibility with protected amino acid synthesis, making the compound a practical chiral intermediate for sulfur-functionalized building blocks.
1. Protected Amino Acid Synthesis
L-cysteine n-amylester hydrochloride serves as a chiral intermediate for protected amino acid synthesis and C-terminal ester management in peptide building block preparation. The L-configuration at the alpha carbon and the presence of the ester allow controlled conversion to activated derivatives for coupling chemistry, while the hydrochloride salt can help stabilize the amine during protection/deprotection sequences. The thioether side chain can be carried through ester activation steps and then converted to thiol-reactive forms when required for peptide-compatible sulfur chemistry. Downstream processing can generate cysteine-containing fragments suitable for assembling peptide sequences or for preparing sulfur-functionalized analogs used in synthetic organic chemistry.
2. Peptide Coupling Chemistry
L-cysteine n-amylester hydrochloride is applicable to peptide synthesis workflows where cysteine residues and sulfur-containing side chains must be incorporated with stereochemical fidelity. The amino ester motif supports C-terminal functional group strategies, enabling conversion to peptide-ready formats that participate in amide bond formation while maintaining the L-stereocenter. The sulfur side chain can be oxidized to sulfoxide or transformed through thiol-generation routes, supporting thiol-selective ligation, disulfide patterning, or controlled side-chain protection logic prior to coupling. The resulting cysteine-containing intermediates can be used to construct peptide fragments, peptidomimetics, and sulfur-rich scaffolds for biochemical research and structure-activity relationship studies.
3. Bioconjugation Thiol Chemistry
L-cysteine n-amylester hydrochloride supports chemical biology and bioconjugation strategies that rely on sulfur functional group transformation from cysteine-derived precursors. The thioether side chain can be routed to thiol-reactive species through oxidation and functional group interconversion steps, enabling conjugation to electrophilic linkers, maleimide-type handles, or other thiol-capture chemistries. The hydrochloride salt and ester group can be leveraged to manage amine reactivity and to stage functional group exposure during conjugation planning. Downstream, the compound can feed into preparation of cysteine-based linkers, labeling reagents, and conjugation intermediates used to generate modified biomolecules for analytical research and molecular interaction studies.
4. Process Chemistry Intermediate
L-cysteine n-amylester hydrochloride is suitable for industrial process chemistry intermediate preparation where amino acid ester handling and sulfur-group staging are central to manufacturing routes. The n-amyl ester provides a defined C-terminal functional group that can be activated or exchanged under controlled conditions, supporting scalable synthesis of amino acid derivatives and peptide coupling inputs. The hydrochloride form improves salt-state manageability for feeding, isolation, and intermediate storage, while the L-chiral backbone limits stereochemical drift during downstream transformations. The compound can be employed as a chiral sulfur-containing feedstock for fine chemical synthesis, including preparation of cysteine building blocks and sulfur-functional intermediates used across peptide ingredient and specialty chemical production.
5. Analytical Research Standards
L-cysteine n-amylester hydrochloride can be used in analytical chemistry for method development and reference material preparation related to cysteine ester and sulfur-species analysis. The defined L-stereochemistry and the presence of both an amino ester and sulfur side chain provide a consistent chemical signature for chromatographic separation and detector response calibration. The compound can serve as a starting material for generating related standards through oxidation state changes or thiol-compatible derivatives, enabling robust characterization of cysteine-containing mixtures. Downstream, these standards support QA/QC-oriented analytical workflows for amino acid derivative libraries, peptide intermediate monitoring, and sulfur-functional compound profiling in research and industrial settings.
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