H-Thr(tBu)-AMC · HCl

H-Thr(tBu)-AMC · HCl is a protected threonine-derived amide hydrochloride in which the threonine side chain is retained as a β-hydroxy stereocenter and the amino group is acylated to form an AMC (7-amino-4-methylcoumarin) reporter amide. The structure combines a tert-butyl-protected hydroxyl equivalent (Thr(tBu)) with an AMC fluorogenic tag, and the presence of HCl indicates formation of a salt that improves handling of the amine-containing reporter. The molecule bears a chiral amino acid backbone with defined stereochemistry at the threonine center, while the tBu group modulates hydroxyl reactivity during coupling, storage, and downstream transformations. The AMC moiety provides a spectroscopically trackable handle, enabling quantitative monitoring of enzymatic turnover, while the protected amino acid framework supports controlled deprotection and conversion into peptide-compatible intermediates.

1. Fluorogenic Enzyme Assays

H-Thr(tBu)-AMC · HCl is applied in biochemical research and analytical screening workflows where AMC-based fluorescence is used to monitor protease, peptidase, or amidase activity. The threonine-derived amide linkage and the AMC reporter allow cleavage or conversion events to be tracked via coumarin emission, while the Thr(tBu) protection strategy helps manage the side-chain hydroxyl during assay preparation. Salt formation with HCl supports reproducible dissolution and consistent assay conditions for amine-containing substrates. Downstream use includes generating calibration standards and comparing substrate specificity across amino acid derivative libraries, aligning amino acid chemistry with enzyme substrate design and mechanistic studies.

2. Protected Amino Acid Building Block

H-Thr(tBu)-AMC · HCl is utilized as a chiral, protected amino acid derivative for constructing peptide-building fragments and for preparing threonine-containing analogs under peptide-synthesis-compatible conditions. The protected side-chain hydroxyl (tBu) reduces undesired side reactions during coupling chemistry, while the AMC amide provides a stable reporter-functional group that can be retained for analytical readouts or transformed during synthesis planning. The defined threonine stereocenter supports stereochemically controlled incorporation into larger peptide or peptidomimetic scaffolds. Subsequent downstream formation can include conversion into deprotected threonine derivatives, AMC-tagged peptide fragments, or intermediate materials used for method development in protected amino acid synthesis.

3. Peptidomimetic SAR Studies

H-Thr(tBu)-AMC · HCl serves in structure-activity relationship investigations where threonine side-chain geometry and hydroxyl functionality are encoded into a measurable AMC-tagged scaffold. The β-hydroxy threonine motif, protected as a tBu ether equivalent, enables controlled functional-group presentation during sequential derivatization or coupling to neighboring residues. The AMC reporter supports rapid readout of binding or processing events in biochemical assays that compare analogs differing at stereochemistry, side-chain protection, or amide connectivity. Broader relevance extends to generating chemically defined peptidomimetic fragments that can be assembled into larger SAR panels for studying how amino acid stereochemistry and side-chain reactivity influence molecular recognition.

4. Process Chemistry Intermediate

H-Thr(tBu)-AMC · HCl can be employed in process chemistry intermediate preparation for manufacturing research reagents where protected amino acid handling and salt formation improve workflow robustness. The tert-butyl protection strategy limits side-chain hydroxyl participation during intermediate isolation and purification steps, while the AMC amide provides a stable chromophore for in-process monitoring and identity confirmation. The hydrochloride salt form supports consistent physical properties for scale-up of analytical substrates and reagent-grade intermediates. Downstream utility includes supplying feedstock for producing AMC-tagged peptide fragments, protected threonine derivatives, and related fine chemical intermediates used across peptide science and chemical manufacturing.

5. Chemical Biology Labeling Probes

H-Thr(tBu)-AMC · HCl is suitable for chemical biology applications that require an amino acid-based tag with a spectroscopic reporter for monitoring biochemical transformations. The threonine-derived amide and the AMC fluorophore enable incorporation into probe designs where side-chain hydroxyl chemistry and amide connectivity influence reactivity and recognition. The Thr(tBu) protection can be leveraged to control deprotection timing, allowing selective unveiling of hydroxyl functionality during probe generation or subsequent conjugation steps. Resulting downstream derivatives may include AMC-labeled amino acid conjugates, threonine-containing probe fragments, and chemically defined reagents for tracking enzymatic processing and biomolecular modification in applied biochemical research.

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