Fmoc-Val-Pro-OH is a protected dipeptide amino acid derivative featuring an N-terminal 9H-fluoren-9-ylmethoxycarbonyl (Fmoc) carbamate on the valine residue and a C-terminal free carboxylic acid (-CO2H) on the proline residue, linking valine and proline through an amide bond. The valine side chain is isopropyl-substituted, while the proline ring provides a secondary amine incorporated into a cyclic structure, and the molecule contains both an Fmoc-protected amino functionality and an unprotected terminal carboxyl group for further coupling. Fmoc-Val-Pro-OH is used as a peptide-building block or intermediate in stepwise peptide synthesis and related solid-phase or solution-phase assembly workflows where the Fmoc group supports controlled N-deprotection and chemoselective amide bond formation.
Fmoc-Val-Pro-OH is a dipeptide acid featuring an N-terminal Fmoc-protecting group and a C-terminal carboxylic acid, with valine and proline residues arranged in a Val-Pro sequence. The stereochemistry is governed by the chiral amino acid centers of valine and the constrained cyclic structure of proline, which together impose defined conformational preferences relevant to peptide secondary structure. The Fmoc carbamate is stable under many coupling conditions yet can be removed under base to regenerate a reactive peptide N-terminus, while the terminal carboxyl group enables further acylation or activation for peptide chain extension. As a protected peptide building block, Fmoc-Val-Pro-OH participates in standard amide-forming chemistry and can serve as a downstream intermediate for generating longer protected peptides and peptidomimetic scaffolds.
1. Peptide Synthesis
Fmoc-Val-Pro-OH is used in solid-phase and solution-phase peptide synthesis where the Fmoc-protected N-terminus supports controlled stepwise coupling and deprotection cycles. The valine side chain provides an aliphatic hydrophobic handle, while proline contributes a secondary amide within a ring that can influence turn formation and backbone rigidity during chain assembly. The free C-terminal carboxylic acid can be activated for amide bond formation, enabling extension at the Val-Pro junction or incorporation as a dipeptide unit in fragment coupling strategies. Downstream, the resulting longer protected peptides can be converted to target sequences by final deprotection and global acidolysis, supporting routine peptide construction for research and manufacturing-scale intermediate preparation.
2. Protected Amino Acid Building Block
Fmoc-Val-Pro-OH functions as a protected peptide building block for preparing N-protected amino acid derivatives and dipeptide intermediates with predictable reactivity. The Fmoc group masks the N-terminus as a carbamate, reducing undesired side reactions during coupling and allowing orthogonal protection logic when additional functional groups are present in the growing peptide. The terminal carboxylic acid provides a defined site for activation to form new amide linkages, supporting sequential peptide elongation without introducing extra protecting-group steps at the C-terminus. This structure can be employed to streamline protected amino acid synthesis workflows where dipeptide incorporation improves route efficiency and supports reproducible fragment assembly in fine chemical production.
3. SAR Studies
Fmoc-Val-Pro-OH is applicable to structure-activity relationship studies that require systematic variation of peptide-like fragments and conformationally constrained motifs. The Val-Pro arrangement introduces hydrophobic character from valine and proline-driven backbone constraints that can modulate local geometry, which is relevant when mapping how sequence context influences binding or recognition in biochemical assays. The protected format enables integration into larger libraries by standard coupling chemistry, supporting generation of analog panels where the dipeptide unit is conserved while neighboring residues are varied. The resulting analogs can be advanced to analytical characterization workflows, with the defined stereochemistry and protected termini supporting consistent synthesis of SAR-relevant peptide scaffolds.
4. Bioconjugation Chemistry
Fmoc-Val-Pro-OH can serve as a peptide fragment precursor for bioconjugation workflows that rely on amide coupling to biomolecule-compatible linkers. The presence of a terminal carboxylic acid and an Fmoc-protected N-terminus allows controlled transformation into activated derivatives after deprotection, enabling attachment to carrier proteins, peptides, or solid supports through well-defined amide-forming steps. Valine's hydrophobic side chain and proline's conformational constraint can influence the local presentation of the conjugated fragment, which may affect solubility and steric accessibility in labeling contexts. Downstream conjugation products can be used to generate molecular probes or assay reagents, leveraging peptide chemistry compatibility for reproducible biomolecule modification.
5. Pharmaceutical Manufacturing Intermediates
Fmoc-Val-Pro-OH is suitable for pharmaceutical manufacturing intermediate preparation where protected peptide fragments are incorporated into controlled synthetic sequences. The Fmoc-protected N-terminus supports scalable peptide assembly logic by enabling repeated deprotection and coupling cycles with minimized side reactions from free amines. The C-terminal carboxylic acid provides a standardized functional handle for activation and coupling in process chemistry, supporting robust fragment joining and intermediate isolation across multi-step routes. The defined stereochemical content and stable protecting-group profile make it compatible with industrial peptide synthesis strategies that require consistent building blocks for downstream active or intermediate peptide materials.
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