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For peptide chemists, a thorough understanding of the chemical properties and synthesis routes of key reagents like Fmoc-Pro-OH is vital for optimizing their work. NINGBO INNO PHARMCHEM CO.,LTD. provides an overview of the chemistry that makes Fmoc-Pro-OH such a valuable tool.
Fmoc-Pro-OH, or Nα-(9-fluorenylmethoxycarbonyl)-L-proline, is an amino acid derivative where the amino group of L-proline is protected by the fluorenylmethoxycarbonyl (Fmoc) group. L-proline itself is unique among the standard amino acids due to its secondary amine structure, where the side chain is bonded to the alpha-amino group, forming a pyrrolidine ring. This structural feature impacts its reactivity and its role in peptide conformation.
The synthesis of Fmoc-Pro-OH typically involves reacting L-proline with Fmoc-Cl (9-fluorenylmethoxycarbonyl chloride) or Fmoc-OSu (N-(9-fluorenylmethoxycarbonyloxy)succinimide) under basic conditions. The choice of base and solvent is critical to ensure high yield and purity, minimizing side reactions such as racemization or over-protection. The resulting Fmoc-Pro-OH is usually a white to off-white crystalline powder, with a characteristic melting point typically around 117-118 °C. Its chemical formula is C20H19NO4, and its molecular weight is approximately 337.37 g/mol. The CAS number for Fmoc-Pro-OH is 71989-31-6.
Key chemical properties that peptide chemists rely on include its solubility, typically good in polar aprotic solvents like DMF (dimethylformamide) and NMP (N-methyl-2-pyrrolidone), which are commonly used in SPPS. The Fmoc group’s acid-lability is low, but its base-lability is high, making it ideal for orthogonal protection strategies in peptide synthesis. For instance, the Kaiser test, commonly used to check for free amino groups, will not yield a positive result with proline residues, necessitating alternative methods like the isatin test to confirm coupling completion at proline residues.
NINGBO INNO PHARMCHEM CO.,LTD. is committed to producing Fmoc-Pro-OH with exceptional purity and enantiomeric integrity. This dedication to quality ensures that chemists can confidently 'buy Fmoc-Pro-OH' for their demanding applications, whether it's for synthesizing complex therapeutic peptides or exploring novel biomolecular structures. Understanding the chemical underpinnings of this reagent empowers peptide chemists to achieve more efficient and successful synthesis protocols.
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