Fmoc-1-aminocyclobutane-1-carboxylic acid is a protected, non-natural amino acid derivative featuring a cyclobutane ring bearing an amino group at the 1-position and a carboxylic acid at the same carbon, classifying it as an amino acid with a constrained cyclic side-chain. The amino functionality is protected with an Fmoc group, providing an N-Fmoc carbamate that controls chemoselectivity during peptide-coupling steps, while the carboxyl group remains available for activation and formation of amide bonds; stereochemistry is not specified in the product name. In peptide chemistry, this Fmoc-protected cyclic amino acid is used as a building block for solid-phase or solution-phase synthesis to introduce a conformationally restricted residue for structure-activity studies, protein engineering constructs, and the preparation of labeled or modified peptide analogues.
CAT No: CP19603
Fmoc-1-aminocyclobutane-1-carboxylic acid is an Fmoc-protected cyclobutane-based amino acid building block featuring a stereogenic center at the ring-substituted carbon bearing both the Fmoc-capped amino group and the carboxylic acid functionality. The rigid cyclobutane scaffold constrains backbone dihedral angles and can influence conformational preferences in peptide chains and peptidomimetic frameworks. The Fmoc group provides orthogonal N-protection for stepwise solid-phase or solution-phase peptide assembly, while the free carboxylic acid enables standard peptide coupling and downstream functional transformations. The combination of a protected amine, a reactive acid handle, and a compact, conformationally restricted side-chain makes the compound suitable as a chiral amino acid intermediate and as a structural element for peptide construction and synthetic methodology development.
1. Peptide Synthesis
Fmoc-1-aminocyclobutane-1-carboxylic acid is applied in peptide synthesis workflows where N-Fmoc protection supports controlled deprotection and iterative amino acid coupling. The amino acid ester/amide-forming reactivity is enabled by the carboxylic acid group, while the cyclobutane ring functions as a conformationally constrained residue that can be incorporated at internal positions to modulate local structure. Compatibility with common peptide coupling strategies allows the building block to be integrated into protected amino acid sequences for both solution-phase synthesis and solid-phase assembly. Downstream, the resulting peptide products can be used to generate constrained analog libraries for method development and structure-function mapping in amino acid chemistry.
2. Peptidomimetics Design
Fmoc-1-aminocyclobutane-1-carboxylic acid supports peptidomimetic construction by introducing a rigid cyclobutane motif that can emulate or disrupt backbone conformations relative to flexible residues. The stereogenic center and ring substitution pattern provide a defined three-dimensional element that can be carried through to amide-linked scaffolds after Fmoc removal and coupling. The retained carboxylic acid reactivity during synthesis enables formation of amide bonds to neighboring residues, supporting incorporation into cyclic or linear constrained frameworks. The resulting cyclobutane-containing peptide analogs can serve as structural probes in molecular design studies focused on conformational control and amino acid derivatization strategies.
3. Chiral Building Block Development
Fmoc-1-aminocyclobutane-1-carboxylic acid functions as a chiral amino acid intermediate for stereoselective synthesis planning where the ring-bearing stereocenter must be preserved through protection, coupling, and functional group interconversions. The Fmoc-protected amine provides a stable handle during transformations that may involve activation of the carboxylic acid, enabling selective chemistry at the acid while maintaining N-protection. The cyclobutane scaffold can be leveraged as a rigid stereochemical reporter in synthetic organic chemistry, particularly when building blocks are required to retain stereochemical integrity across multiple steps. Downstream derivatization of the carboxyl group into activated intermediates or amide derivatives can feed into fine chemical synthesis and chiral scaffold assembly.
4. Side-Chain Functionalization
Fmoc-1-aminocyclobutane-1-carboxylic acid is suitable for side-chain functionalization strategies in amino acid modification programs where the cyclobutane framework can be used as a platform for further chemical elaboration. The compound's protected amine and carboxylic acid enable controlled conversion into peptide-coupling-ready derivatives, allowing introduction of the cyclobutane residue into larger molecules before additional functional group installation. The rigid ring can influence how appended substituents are displayed in three-dimensional space, which may be beneficial for generating defined steric environments in synthetic libraries. Downstream products include carboxamide derivatives and functionalized analogs that can be used as intermediates for biochemical research reagents and synthetic methodology expansion.
5. Pharmaceutical Intermediate Preparation
Fmoc-1-aminocyclobutane-1-carboxylic acid is relevant to pharmaceutical intermediate preparation where protected amino acid derivatives are used to build constrained fragments for medicinal chemistry programs. The Fmoc group provides orthogonal N-protection that can be removed under standard deprotection conditions to expose the amine for subsequent coupling, while the carboxylic acid supports conversion into activated species for amide bond formation. The cyclobutane residue can be incorporated into peptide-like structures or peptidomimetic scaffolds that require conformational restriction, supporting downstream generation of structurally defined analogs used in process chemistry intermediate supply chains. The compound's role as a chiral, protected amino acid building block aligns with industrial fine chemical synthesis practices that depend on predictable protection-group behavior and scalable intermediate handling.
6. Analytical Research Standards
Fmoc-1-aminocyclobutane-1-carboxylic acid can be employed in analytical research as a reference standard and method development component for monitoring protected amino acid handling, deprotection steps, and peptide coupling outcomes. The presence of the Fmoc chromophore and the distinct cyclobutane-containing backbone enable traceable detection in chromatographic workflows and mass-based identification of protected versus deprotected forms. The stereogenic cyclobutane center helps distinguish stereochemical variants when analytical methods are designed to resolve or verify stereochemical integrity in amino acid derivative synthesis. Downstream, the compound supports quality control of intermediate preparation and characterization of peptide building block incorporation in research-grade synthetic campaigns.
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