Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride is a protected amino acid N-carboxyanhydride (NCA) derived from L-threonine, bearing an Fmoc carbamate on the amino function and a tert-butyl oxy protecting group on the side-chain hydroxyl. The molecule contains the NCA reactive carbonyl within the carboxyanhydride ring while retaining the threonine backbone stereochemistry as indicated by "L," and it presents a side-chain alcohol that is masked as an O-tert-butyl ether to control chemoselectivity during peptide bond formation. In peptide chemistry, such Fmoc-protected threonine NCA intermediates are employed as monomeric building blocks for polymer and peptide synthesis workflows where stepwise incorporation of the protected amino acid unit and subsequent deprotection can be used to access threonine-containing peptide derivatives.
CAT No: CP01919
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride is an Fmoc-protected, threonine-derived N-carboxyanhydride (NCA) that encodes the L-configuration chiral center of threonine while presenting a side-chain O-tert-butyl ether for orthogonal protection. The molecule combines an activated carboxyanhydride electrophile with an Fmoc carbamate, enabling controlled peptide-bond formation under conditions compatible with Fmoc chemistry. The tert-butyl-protected hydroxyl side chain modulates nucleophilicity during polymerization or coupling, while the Fmoc group provides a removable handle for stepwise chain assembly. As a reactive amino acid NCA, it functions as a peptide building block precursor and as a chiral intermediate for downstream amino acid derivatization and protected peptide analog construction.
1. Peptide Synthesis
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride supports Fmoc-based peptide construction and NCA-mediated assembly routes where activated amino acid monomers are polymerized or sequentially incorporated. The threonine backbone provides a stereodefined chiral center for consistent stereochemical outcomes in the resulting peptide chain, while the O-tert-butyl ether preserves the side-chain hydroxyl from premature acylation or side reactions during coupling. The Fmoc carbamate and the carboxyanhydride activation state enable orthogonal protection strategies, where Fmoc removal can expose the growing peptide N-terminus for subsequent coupling cycles. The resulting threonine-containing protected peptides and peptide fragments can be advanced to deprotected side-chain alcohol derivatives for further functionalization and structure-activity relationship studies.
2. Peptidomimetics And SAR Studies
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride is suitable for peptidomimetic and SAR-focused scaffold generation that requires controlled incorporation of threonine stereochemistry and a protected side-chain hydroxyl. The O-tert-butyl group can be retained during initial chain assembly to maintain chemoselectivity, then removed to reveal a handle for side-chain modifications such as esterification, ether formation, or conjugation chemistry. The activated NCA format facilitates access to threonine-rich segments and analog libraries where side-chain functional groups are varied after assembly. Downstream derivatives produced from the deprotected alcohol can be used to probe molecular recognition features and to support systematic SAR mapping in medicinal chemistry and chemical biology workflows.
3. Protected Amino Acid Chemistry
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride can be employed as a protected amino acid intermediate for preparing Fmoc-threonine derivatives and for generating threonine-containing building blocks with defined protection patterns. The combination of Fmoc on the amino functionality and tert-butyl protection on the side-chain oxygen provides orthogonal deprotection logic, allowing selective unmasking of the N-terminus for iterative coupling while deferring side-chain exposure. The carboxyanhydride electrophile enables conversion into peptide-linked intermediates or protected amino acid derivatives through nucleophilic capture by amines, supporting synthetic flexibility in route design. The resulting protected threonine materials can be used for fine chemical synthesis, peptide fragment preparation, and downstream derivatization into functionalized amino acid reagents.
4. Polymer And Bioconjugation Linkers
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride can participate in polymer chemistry and materials-oriented peptide conjugation strategies where threonine-containing repeating units or linker segments are required. The threonine side-chain O-tert-butyl ether and the Fmoc-protected N-terminus help regulate reactivity during polymer formation or stepwise functionalization, limiting uncontrolled side reactions of the hydroxyl group. The activated NCA can be incorporated into chain backbones that later undergo deprotection to generate pendant alcohol functionalities for subsequent attachment of biomolecules, dyes, affinity tags, or surface-reactive groups. The resulting threonine-functional polymers and conjugation-ready intermediates support downstream construction of bioconjugates and chemically defined macromolecular tools.
5. Pharmaceutical Manufacturing Intermediates
Fmoc-O-tert.butyl-L-threonineN-carboxyanhydride is applicable to pharmaceutical intermediate preparation where protected amino acid building blocks are required for controlled peptide synthesis in process chemistry settings. The Fmoc group and tert-butyl-protected hydroxyl provide a protection scheme compatible with stepwise manufacturing workflows that rely on orthogonal deprotection and chemoselective coupling. The NCA activation mode can be leveraged to produce threonine-containing protected intermediates that feed into larger peptide assembly sequences, supporting reproducible chain incorporation of the L-threonine stereocenter. The resulting protected peptide fragments and derivatization-ready intermediates can be advanced toward final drug substance-related synthetic targets and analytical reference materials used during manufacturing development.
If you have any peptide synthesis requirement in mind, please do not hesitate to contact us at . We will endeavor to provide highly satisfying products and services.
Creative Peptides is a trusted CDMO partner specializing in high-quality peptide synthesis, conjugation, and manufacturing under strict cGMP compliance. With advanced technology platforms and a team of experienced scientists, we deliver tailored peptide solutions to support drug discovery, clinical development, and cosmetic innovation worldwide.
From custom peptide synthesis to complex peptide-drug conjugates, we provide flexible, end-to-end services designed to accelerate timelines and ensure regulatory excellence. Our commitment to quality, reliability, and innovation has made us a preferred partner across the pharmaceutical, biotechnology, and personal care industries.
Read More