L-Serine tert.butyl ester hydrochloride is a protected amino acid ester derived from the proteinogenic amino acid L-serine, featuring a tert-butyl ester on the carboxyl group and a free primary amino group. The molecule contains a side-chain hydroxymethyl group characteristic of serine, and the tert-butyl ester and amino hydrochloride form control the protonation state of the amine while masking the carboxyl functionality relative to the corresponding free amino acid. As an amino acid ester hydrochloride, it is employed in peptide-related intermediate preparation and in solution-phase or solid-phase synthetic sequences where a serine side-chain alcohol and an esterified carboxyl group require chemoselective handling.
CAT No: CP01843
L-Serine tert.butyl ester hydrochloride is the hydrochloride salt of L-serine protected as a tert-butyl ester, retaining the L-configuration at the α-carbon while presenting a free amino group as its salt form and an esterified carboxyl group. The molecule combines an amino functionality that can be neutralized for coupling chemistry with a tert-butyl ester that is stable under many handling conditions yet can be cleaved under acidolytic or controlled deprotection conditions to regenerate the carboxylic acid. The side chain bears a primary hydroxymethyl group, enabling selective derivatization to access O-functional serine derivatives for peptide and medicinal chemistry workflows. As an amino acid ester intermediate, it participates in protected amino acid synthesis strategies where stereochemical integrity and side-chain reactivity must be managed through orthogonal protection and controlled functional group transformations.
1. Protected Amino Acid Synthesis
L-Serine tert.butyl ester hydrochloride supports protected amino acid synthesis by pairing an L-serine chiral center with a tert-butyl ester handle that can be carried through coupling steps and later converted back to the carboxylic acid for peptide building block preparation. The hydrochloride form regulates the amine's nucleophilicity during storage and can be adjusted to enable amide bond formation under standard peptide coupling conditions. The side-chain hydroxymethyl group provides a defined functional handle for orthogonal protection or selective O-derivatization, which is relevant when constructing serine-containing sequences or serine-based analogs. Downstream, the compound can be converted into N- and C-protected serine derivatives that fit into iterative peptide assembly and fragment coupling strategies used in research-grade and process-oriented fine chemical synthesis.
2. Peptide Coupling Chemistry
L-Serine tert.butyl ester hydrochloride is suitable for peptide coupling chemistry workflows where serine residues must be introduced with stereochemical fidelity and a controlled C-terminal functionality. The tert-butyl ester serves as a protected carboxyl group for C-terminal activation and subsequent incorporation into peptide chains, while the amino functionality as the hydrochloride salt can be managed to align with coupling reagent compatibility. The serine side-chain hydroxyl can be protected or left to participate in later functionalization, enabling access to peptide segments that require either free hydroxyl for post-coupling modification or protected hydroxyl for sequence stability. Resulting peptide intermediates and serine-containing peptide analogs can be generated for biochemical research, SAR studies, and synthetic methodology development that rely on reproducible amino acid building blocks.
3. Side-Chain Functionalization
L-Serine tert.butyl ester hydrochloride enables side-chain functionalization strategies through its primary hydroxymethyl group, which can be transformed into O-alkyl, O-acyl, or O-heteroatom-substituted serine derivatives used in peptidomimetic construction. The presence of an ester-protected carboxyl group allows selective manipulation of the side chain without immediately exposing the carboxylate, supporting chemoselective derivatization sequences in synthetic organic chemistry. Hydrochloride salt formation provides a practical handle for controlling amine reactivity during multi-step functional group transformations, which is useful when preparing serine analogs for fragment assembly. Downstream utility includes generating functionalized serine building blocks for peptide analog libraries, molecular scaffold diversification, and intermediate preparation for further coupling or conjugation chemistry.
4. Chemical Biology And Labeling
L-Serine tert.butyl ester hydrochloride supports chemical biology and labeling applications where serine-derived motifs are incorporated into probes, linkers, and recognition elements requiring defined stereochemistry and functional group placement. The L-configuration and side-chain hydroxyl provide a chemically recognizable serine signature for building peptide-like structures that can undergo subsequent derivatization to introduce tags, affinity handles, or reactive groups. The tert-butyl ester can be converted to a carboxylic acid for downstream attachment to linkers or for incorporation into larger biomolecule constructs, while the amino functionality enables formation of amide-linked intermediates in probe synthesis. Resulting labeled peptides or serine-containing conjugation intermediates can be used for biomolecule modification and analytical research where controlled functional group density and stereochemical consistency matter.
5. Process Chemistry Intermediate
L-Serine tert.butyl ester hydrochloride can be employed as a process chemistry intermediate for manufacturing routes that require a stable amino acid ester form with a cleavable protecting group strategy. The tert-butyl ester provides a practical protection scheme for the carboxyl functionality during upstream steps, while the hydrochloride salt form helps manage amine handling and reproducibility across batch operations. The side-chain hydroxymethyl group supports controlled derivatization to serine-specific downstream intermediates, which is relevant for producing protected serine derivatives used in peptide building block supply chains. Downstream, the compound can feed into fine chemical synthesis of N-/C-protected serine reagents, enabling scalable preparation of serine-containing intermediates for peptide manufacturing and industrial chemical production workflows.
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