L-Cyclohexylglycine tert.butyl ester hydrochloride is a protected amino acid derivative in which L-cyclohexylglycine has been converted to a tert-butyl ester and paired with hydrochloride, classifying it as an amino acid ester salt rather than a free amino acid. The molecule contains an amino functional group and a carboxyl group masked as a tert-butyl ester, with the cyclohexyl side chain providing a hydrophobic, sterically demanding residue for peptide and structure-activity studies. In synthesis, the ester and salt form help control chemoselectivity and solubility during stepwise assembly of peptide-related intermediates or the preparation of cyclohexylglycine-containing analogues for chemical biology and analytical method development.
CAT No: CP21112
L-Cyclohexylglycine tert.butyl ester hydrochloride is an L-configured cyclohexylglycine amino acid esterified as the tert-butyl ester and present as a hydrochloride salt, combining a chiral α-carbon with a bulky, hydrophobic side chain. The structure features an amino functionality as the protonated salt form, paired with a carboxyl group masked as a tert-butyl ester that can be selectively removed under acid-mediated conditions to regenerate the free carboxylic acid. The cyclohexyl side chain increases steric bulk and hydrophobic character relative to simpler glycine derivatives, supporting incorporation into peptide-like scaffolds where conformational and lipophilicity effects are relevant. As a chiral amino acid ester hydrochloride, it serves as a protected amino acid intermediate with defined stereochemistry and functional group reactivity suited to peptide coupling and downstream derivatization.
1. Peptide Synthesis
L-Cyclohexylglycine tert.butyl ester hydrochloride is used in peptide building workflows where a chiral amino acid ester can be converted into an activated coupling partner for amide bond formation. The L-stereocenter and the cyclohexyl side chain provide a defined stereochemical and steric environment that can influence peptide conformation and side-chain packing in short peptides and peptidomimetic fragments. The tert-butyl ester protection strategy enables controlled deprotection to the corresponding carboxylic acid when preparing for sequential coupling steps, while the hydrochloride salt form supports handling and conversion to the free amine under standard peptide chemistry conditions. The resulting amino acid derivative can be incorporated as a C-terminal or internal residue building block, supporting synthesis of analog libraries for structure-function studies and synthetic method development.
2. Side-Chain Functionalization
L-Cyclohexylglycine tert.butyl ester hydrochloride supports side-chain and backbone functionalization strategies that probe hydrophobic substitution effects in amino acid chemistry. The cyclohexyl group provides a nonpolar handle that can be maintained during functional group transformations, allowing selective modification of the ester-protected carboxylate and the amino functionality through orthogonal protection and deprotection sequences. The tert-butyl ester can be removed to expose a carboxylic acid for subsequent derivatization, such as conversion to amides, activated esters, or coupling-ready acids for further scaffold elaboration. The hydrochloride salt form can also facilitate controlled generation of nucleophilic amine species, enabling downstream attachment to linkers, reporter moieties, or polymerizable units used in chemical biology and material-oriented conjugation routes.
3. Chiral Amino Acid Intermediate
L-Cyclohexylglycine tert.butyl ester hydrochloride functions as a chiral amino acid intermediate for stereoselective synthesis of substituted peptide analogs and constrained building blocks. The L-configuration at the α-carbon is preserved through esterification and salt formation, supporting stereochemical integrity from intermediate preparation through peptide coupling and final deprotection. The tert-butyl ester protection provides a process-compatible carboxyl masking group that can be removed to regenerate the acid for subsequent activation steps, while the amino hydrochloride state supports reproducible handling during multi-step syntheses. The compound's defined stereochemistry and protected functional groups make it suitable for producing enantiopure derivatives used in SAR studies, fragment assembly, and chiral pool-inspired synthetic routes targeting amino acid-derived motifs.
4. Peptidomimetics And SAR Studies
L-Cyclohexylglycine tert.butyl ester hydrochloride is applied in peptidomimetic construction where incorporation of a cyclohexylglycine residue can modulate conformational preferences and hydrophobic surface area. The protected amino acid ester format aligns with iterative assembly of peptide-like scaffolds, enabling controlled introduction of the bulky side chain into backbone sequences while maintaining functional group compatibility for coupling chemistry. The ability to deprotect the tert-butyl ester to the free carboxylic acid supports generation of analogs with altered terminal functionality, including conversion to amides or linkage points for scaffold diversification. The resulting cyclohexylglycine-containing intermediates can be used to build structure-activity relationship panels for studying how stereochemistry and side-chain sterics influence binding motifs and molecular recognition in biochemical assays.
5. Pharmaceutical Intermediate Preparation
L-Cyclohexylglycine tert.butyl ester hydrochloride is suitable for industrial fine chemical synthesis routes that require protected chiral amino acid intermediates for drug-like scaffold assembly. The tert-butyl ester and hydrochloride salt combination provides a practical protection strategy for managing reactive amine and carboxyl functionalities during stepwise synthesis of amide-containing intermediates. The cyclohexyl side chain contributes hydrophobic character that is often leveraged in medicinal chemistry to tune solubility and receptor interaction profiles, while the maintained L-stereochemistry supports consistent quality of downstream chiral building blocks. The compound can therefore serve as a manufacturing intermediate for producing amino acid-derived fragments, coupling partners, and protected derivatives used in the synthesis of peptide-inspired small molecules and related intermediates.
6. Chemical Manufacturing And Process Chemistry
L-Cyclohexylglycine tert.butyl ester hydrochloride can be employed in process chemistry contexts where protected amino acid esters are used to streamline multi-step manufacturing of peptide building blocks. The tert-butyl ester protection group enables staged deprotection to the corresponding acid, supporting route design that separates carboxyl activation from earlier handling steps and reduces cross-reactivity during intermediate isolation. The hydrochloride salt form can improve stability and handling characteristics for the amino functionality, facilitating conversion to coupling-ready forms in controlled synthetic sequences. The chiral amino acid ester framework supports scalable synthesis of cyclohexylglycine-containing derivatives used in specialty chemical production and in the preparation of downstream reagents for peptide coupling, conjugation, and functional material precursor generation.
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