Fmoc-(3S,4S)ACHPA-OH

Fmoc-(3S,4S)ACHPA-OH is an Fmoc-protected, chiral amino acid derivative bearing a stereodefined side chain with two contiguous stereocenters at the 3S,4S positions. The structure integrates an N-Fmoc protecting group for orthogonal compatibility with standard solid-phase peptide synthesis conditions, while the free carboxylic acid enables direct incorporation as a peptide building block or conversion into activated coupling derivatives. The side-chain functionality present in the ACHPA framework can participate in further derivatization or scaffold elaboration, supporting downstream formation of functionalized peptide analogs and stereochemically constrained intermediates. The combination of protected amine, carboxylic acid reactivity, and defined stereochemistry makes the compound suitable as a chiral intermediate for amino acid derivatization and peptide construction workflows.

1. Peptide Synthesis

Fmoc-(3S,4S)ACHPA-OH is used in peptide building block preparation for automated and manual peptide synthesis, where the N-Fmoc group supports controlled N-deprotection and subsequent peptide bond formation. The chiral amino acid backbone with a free C-terminal carboxylic acid allows coupling to activated carboxylates or peptide-resin intermediates under peptide coupling chemistry, while the 3S,4S stereochemistry is retained to preserve side-chain stereochemical information in the growing sequence. The ACHPA side-chain architecture can be carried through as a functional motif that influences conformational bias and side-chain recognition in peptide analogs. Peptide synthesis compatibility enables downstream generation of stereodefined peptides, peptidomimetics, and library members for structure-focused studies and synthetic methodology development.

2. Chiral Amino Acid Intermediate

Fmoc-(3S,4S)ACHPA-OH serves as a chiral amino acid intermediate for stereoselective synthesis planning, leveraging the fixed 3S,4S configuration to control stereochemical outcomes in subsequent transformations. The Fmoc-protected amine provides a stable handle during side-chain functional group modifications, while the free carboxylic acid can be converted into amide, ester, or activated intermediates for targeted downstream chemistry. Side-chain elaboration pathways can use the ACHPA framework to generate functional derivatives that maintain the stereochemical integrity of the original building block. Chiral intermediate utility supports fine chemical synthesis routes where stereodefined amino acid derivatives are required for peptide construction, SAR-focused scaffold generation, and intermediate preparation for larger synthetic sequences.

3. Peptidomimetics And SAR

Fmoc-(3S,4S)ACHPA-OH is applied in peptidomimetic construction and structure-activity relationship studies where stereochemically constrained amino acid motifs are embedded into analogs to probe molecular recognition. The Fmoc-protected nitrogen enables stepwise assembly into peptide-like backbones, while the free carboxyl group supports controlled incorporation at the C-terminus or conversion into derivatives for cyclization, conjugation, or scaffold diversification. The 3S,4S stereochemistry and side-chain features of the ACHPA residue can modulate conformational preferences and influence interaction patterns in SAR-oriented libraries. Synthetic access to stereodefined analogs supports iterative design cycles in molecular design workflows and biochemical research intermediate generation for structure-informed testing.

4. Chemical Biology Conjugation

Fmoc-(3S,4S)ACHPA-OH is suitable for chemical biology workflows that require incorporation of a defined amino acid residue into functional conjugates or tagged biomolecules. The protected amine and carboxylic acid functionality facilitate orthogonal handling, allowing the Fmoc group to be removed when needed and the acid functionality to be used for coupling to amines, linkers, or activated electrophiles. The stereodefined side chain can serve as a recognition element within conjugates, supporting consistent structural presentation across a series of labeled or modified molecules. Downstream derivative formation enables generation of peptide-based probes, linker-bearing intermediates, and biomolecule modification building blocks that retain stereochemical fidelity from the amino acid stage.

5. Pharmaceutical Intermediate Preparation

Fmoc-(3S,4S)ACHPA-OH is employed in pharmaceutical intermediate preparation for synthetic routes that require protected amino acid chemistry compatible with process-scale peptide and peptidomimetic manufacturing steps. The Fmoc-protected amine supports controlled deprotection and coupling operations, while the free carboxylic acid enables conversion into activated intermediates used for building larger amide-containing fragments. The defined 3S,4S stereocenters help ensure stereochemical consistency in downstream synthetic sequences where chiral purity and structural integrity are required for intermediate consistency. Industrially relevant manufacturing routes can use this amino acid derivative as a standardized chiral input for constructing stereodefined fragments, supporting specialty chemical production and fine chemical synthesis where amino acid-based intermediates are integrated into larger product frameworks.

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