Fmoc-3-(3-benzothienyl)-D-alanine

Fmoc-3-(3-benzothienyl)-D-alanine is an Fmoc-protected, D-configured amino acid derivative in which the chiral alpha-carbon is appended to a 3-benzothienyl side chain, providing an aromatic heterocycle for π-interactions and scaffold diversification. The molecule contains the Fmoc carbamate on the amino group and a carboxyl functionality that is typically handled as the free acid or activated derivative during peptide assembly, enabling standard peptide coupling chemistry. The benzothiophene-like aromatic system bears a sulfur-containing heteroaromatic motif that can participate in electrophilic aromatic substitution, oxidative transformations, and metal-coordination or binding studies, while remaining compatible with orthogonal protection strategies on other functional groups. The stereochemical integrity of the D-alanine core supports predictable incorporation into peptide sequences and chiral SAR workflows, making the compound a practical chiral building block for protected amino acid synthesis and downstream peptidomimetic construction.

1. Peptide Synthesis

Fmoc-3-(3-benzothienyl)-D-alanine is used in peptide building block preparation for solid-phase peptide synthesis and related protected amino acid assembly workflows. The Fmoc carbamate enables base-mediated deprotection to generate a reactive N-terminus for sequential peptide coupling, while the D-alanine stereocenter controls the configuration of the inserted residue. The 3-(3-benzothienyl) side chain introduces a hydrophobic, sulfur-containing aromatic functionality that can be carried through coupling steps without requiring additional side-chain protection, supporting C-C and C-N bond formation strategies focused on backbone elongation. The resulting peptide products can be used as chiral, heteroaromatic-containing analogs for method development, library synthesis, and structure-guided optimization in amino acid chemistry and peptide science.

2. Peptidomimetics And SAR

Fmoc-3-(3-benzothienyl)-D-alanine is applied in peptidomimetic construction and structure-activity relationship studies where incorporation of a heteroaryl side chain is used to modulate binding modes and physicochemical properties. The benzothienyl aromatic motif enables tuning of π-stacking, polarizability, and potential sulfur-involved interactions, while the D-alanine backbone can influence conformational preferences and proteolytic stability patterns in peptide-like scaffolds. The Fmoc-protected amino acid format supports iterative synthesis of analog series with controlled stereochemistry at the residue level, facilitating systematic SAR comparisons across position-specific substitutions. Downstream derivatives can be further functionalized at the aromatic system or used as a defined chiral intermediate for generating constrained or cyclized peptidomimetics.

3. Chemical Biology Probes

Fmoc-3-(3-benzothienyl)-D-alanine is suitable for chemical biology research requiring amino acid-derived probes that incorporate a defined chiral center and a sulfur-containing aromatic handle. The Fmoc-protected amine supports incorporation into peptide tags, affinity ligands, or labeling constructs where sequential assembly and later deprotection yield a stable, residue-defined conjugation site. The benzothienyl side chain can serve as a recognition element for molecular binding studies and can also be leveraged for downstream derivatization routes that introduce reporter groups or reactive moieties through aromatic functional transformations. The resulting labeled peptides or peptidomimetics can function as tools for studying biomolecular interactions, protein surface recognition, and binding-site mapping using amino acid chemistry-compatible workflows.

4. Side-Chain Functionalization

Fmoc-3-(3-benzothienyl)-D-alanine is used as a chiral intermediate for side-chain functionalization strategies that expand the chemical space of heteroaryl-containing amino acid derivatives. The 3-(3-benzothienyl) group provides an aromatic heterocycle that can potentially undergo electrophilic substitution, oxidative modification, or cross-coupling-based diversification depending on the substitution pattern and chosen conditions. The Fmoc group offers a protecting-group strategy that can be removed orthogonally to allow selective coupling or further derivatization at the nitrogen-bearing position, while preserving the side-chain heteroaromatic motif for later transformation. The compound therefore supports synthetic organic chemistry routes that generate functional amino acid derivatives, including building blocks for heteroaryl-substituted peptidomimetics, constrained scaffolds, and intermediate-grade materials for specialty chemical production.

5. Pharmaceutical Intermediate Preparation

Fmoc-3-(3-benzothienyl)-D-alanine is applied in pharmaceutical intermediate preparation for manufacturing-oriented synthesis of protected amino acid derivatives and peptide-like intermediates. The Fmoc-protected amino group provides a robust protection scheme compatible with industrial peptide coupling chemistries, while the D-alanine stereocenter supports stereochemically defined incorporation into downstream intermediates used for process development. The benzothienyl aromatic side chain contributes a chemically stable heteroaromatic functionality that can be carried through multi-step sequences and later converted into analogs through controlled functional group transformations. The compound can be employed as a chiral, residue-specific intermediate for fine chemical synthesis programs where reproducible stereochemistry and protected-amino handling are required for scalable peptide-building workflows.

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