H-D-TIC-OTBU HCL

H-D-TIC-OTBU HCL is a hydrochloride salt of a tert-butyl ester-protected amino acid derivative featuring a deuterated stereochemical designation (D) and a side-chain framework consistent with TIC-type amino acid chemistry. The molecule contains an N-terminal acylated/blocked amine motif (H-D-TIC-) paired with a C-terminal tert-butyl ester (-OTBU), which provides a protected carboxyl functionality that can be carried through peptide coupling sequences without uncontrolled amide formation. The presence of the hydrochloride counterion improves handling of the amine-containing component and supports salt-based storage and downstream conversion steps. The deuterium labeling and the protected ester group together create a chiral, isotopically informative building block suitable for stereodefined peptide assembly, mechanistic studies, and analytical reference material preparation.

1. Peptide Synthesis

H-D-TIC-OTBU HCL is applied as a protected amino acid ester in peptide building block preparation where C-terminal tert-butyl ester protection supports controlled peptide coupling chemistry. The N-terminal "H-D-TIC-" functionality and the ester-protected carboxyl group can be incorporated into stepwise solid-phase or solution-phase peptide construction, enabling selective activation of the carboxyl terminus while maintaining the ester during earlier transformations. The deuterium label at the defined stereochemical position can be retained through coupling to generate isotope-resolved peptide analogs for method development and structural confirmation. Downstream deprotection and conversion to the corresponding free acid or activated derivative can be used to extend peptide chains or to generate defined termini for further functionalization in synthetic peptide workflows.

2. Isotope-Labeled SAR Studies

H-D-TIC-OTBU HCL supports structure-activity relationship studies that benefit from deuterium incorporation for mass spectrometric tracking and kinetic or metabolic pathway probing. The deuterated stereocenter provides an atomically specific label that can be used to distinguish closely related peptide analogs, including positional isomers or stereochemical variants, during LC-MS/MS-based characterization. The tert-butyl ester protection helps maintain the labeled carboxyl functionality during derivatization steps that precede coupling or conjugation, reducing label scrambling from harsh conditions. The resulting labeled peptides or peptidomimetic fragments can serve as reference standards for analytical research, enabling reliable comparison of fragmentation patterns and chromatographic behavior across SAR panels.

3. Side-Chain Functionalization

H-D-TIC-OTBU HCL is suitable for synthetic organic chemistry routes that require a protected amino acid intermediate for side-chain modification and subsequent peptide-compatible elaboration. The protected ester form (OTBU) allows the molecule to be carried through transformations that target the TIC-type side-chain functionality while preventing premature carboxyl activation or undesired amide formation. Deuterium at the stereochemical position provides a controlled isotopic handle that can be preserved during side-chain derivatization, supporting downstream generation of functional analogs for chemical biology probes. The hydrochloride salt form can also facilitate reproducible handling during intermediate preparation, supporting conversion to activated carboxylic acid derivatives used for subsequent coupling or conjugation steps.

4. Protected Amino Acid Intermediates

H-D-TIC-OTBU HCL functions as a chiral, protected amino acid intermediate for manufacturing-oriented fine chemical synthesis where orthogonal protection is required to manage multi-functional reactivity. The tert-butyl ester provides a protection strategy that can be removed under conditions compatible with peptide synthesis sequences, enabling a controlled switch from protected carboxyl to reactive acid for activation and coupling. The N-terminal blocked/handled amine motif and the hydrochloride counterion support stable intermediate handling and conversion into activated forms such as acid derivatives suitable for peptide bond formation. Deuterium labeling adds a stereochemically defined isotopic element that can be carried into downstream intermediates, supporting the preparation of labeled peptide building blocks, analytical standards, and isotope-resolved reagents used across applied amino acid chemistry workflows.

5. Chemical Biology Probes

H-D-TIC-OTBU HCL can be employed in chemical biology research to generate peptide-based probes that require defined stereochemistry and isotopic traceability. The amino acid ester protection supports incorporation into probe scaffolds without uncontrolled hydrolysis, while the deuterated stereocenter enables sensitive detection and discrimination of probe species in complex mixtures. The hydrochloride salt form supports consistent solubility behavior during probe assembly and subsequent conjugation steps that rely on peptide coupling compatibility. The resulting labeled peptide fragments can be used to investigate molecular recognition, binding kinetics, or labeling efficiency through analytical readouts that exploit the isotope signature and the controlled functional group presentation inherited from the amino acid building block.

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