Cas no 252049-18-6 (Fmoc-S-benzyl-D-cysteine)

Fmoc-S-benzyl-D-cysteine is a protected amino acid derivative widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). The Fmoc (9-fluorenylmethoxycarbonyl) group serves as a temporary protecting group for the α-amino group, while the S-benzyl moiety protects the thiol functionality of the cysteine side chain. This compound is essential for introducing D-cysteine residues into peptide sequences, enabling the study of stereospecific interactions and structural modifications. Its high purity and stability under standard SPPS conditions ensure reliable coupling efficiency and minimal side reactions. The orthogonal protection strategy allows selective deprotection, facilitating controlled disulfide bond formation in complex peptide architectures. Fmoc-S-benzyl-D-cysteine is particularly valuable in pharmaceutical research for developing bioactive peptides with enhanced metabolic stability.
Fmoc-S-benzyl-D-cysteine structure
Fmoc-S-benzyl-D-cysteine structure
Product Name:Fmoc-S-benzyl-D-cysteine
CAS No:252049-18-6
MF:C25H23NO4S
MW:433.519425630569
MDL:MFCD02259496
CID:246483
PubChem ID:13585939
Update Time:2025-07-02

Fmoc-S-benzyl-D-cysteine Chemical and Physical Properties

Names and Identifiers

    • D-Cysteine,N-[(9H-fluoren-9-ylmethoxy)carbonyl]-S-(phenylmethyl)-
    • Fmoc-D-Cys(Bzl)-OH
    • Fmoc-S-benzyl-D-cysteine
    • (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-3-(benzylthio)propanoic acid
    • (2S)-3-benzylsulfanyl-2-(9H-fluoren-9-ylmethoxycarbonylamino)propanoic acid
    • AKOS015837442
    • S-Benzyl-N-{[(9H-fluoren-9-yl)methoxy]carbonyl}-D-cysteine
    • (2S)-3-(benzylsulfanyl)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}propanoic acid
    • (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-3-(benzylthio)propanoicacid
    • AS-72157
    • Fmoc-(S)-benzyl-L-Cys
    • J-015870
    • 252049-18-6
    • DTXSID30544407
    • D-Cysteine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-S-(phenylmethyl)-
    • AKOS015888721
    • Fmoc-Cys(Bzl)-OH;
    • (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-3-(benzylthio)propanoic acid
    • Fmoc-D-Cys(Bzl)-OH, >=98.0% (HPLC)
    • MDL: MFCD02259496
    • Inchi: 1S/C25H23NO4S/c27-24(28)23(16-31-15-17-8-2-1-3-9-17)26-25(29)30-14-22-20-12-6-4-10-18(20)19-11-5-7-13-21(19)22/h1-13,22-23H,14-16H2,(H,26,29)(H,27,28)/t23-/m1/s1
    • InChI Key: AKXYVGAAQGLAMD-HSZRJFAPSA-N
    • SMILES: S(CC1C=CC=CC=1)C[C@H](C(=O)O)NC(=O)OCC1C2C=CC=CC=2C2=CC=CC=C12

Computed Properties

  • Exact Mass: 433.13489
  • Monoisotopic Mass: 433.13477939g/mol
  • Isotope Atom Count: 0
  • Hydrogen Bond Donor Count: 2
  • Hydrogen Bond Acceptor Count: 5
  • Heavy Atom Count: 31
  • Rotatable Bond Count: 10
  • Complexity: 586
  • Covalently-Bonded Unit Count: 1
  • Defined Atom Stereocenter Count: 1
  • Undefined Atom Stereocenter Count : 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • XLogP3: 4.8
  • Topological Polar Surface Area: 101?2

Experimental Properties

  • PSA: 75.63
  • LogP: 5.30260

Fmoc-S-benzyl-D-cysteine Security Information

  • WGK Germany:3
  • FLUKA BRAND F CODES:10
  • Storage Condition:2-8°C
  • HazardClass:IRRITANT

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Additional information on Fmoc-S-benzyl-D-cysteine

Introduction to Fmoc-S-benzyl-D-cysteine (CAS No. 252049-18-6)

Fmoc-S-benzyl-D-cysteine, with the chemical name N-(fluorenylmethyloxy-carbonyl)-S-benzyl-D-cysteine, is a specialized compound widely utilized in the field of peptide synthesis and bioconjugation. This compound, identified by its CAS number CAS No. 252049-18-6, plays a crucial role in the development of pharmaceutical intermediates and biomedical research. Its unique structure, combining the Fmoc (fluorenylmethyloxy-carbonyl) protecting group with a S-benzyl moiety on the D-cysteine backbone, makes it an invaluable tool for synthetic chemists and biochemists.

The Fmoc group is particularly significant in peptide chemistry as it provides an efficient and reversible protection strategy for the amino group during solid-phase peptide synthesis (SPPS). This protection allows for sequential addition of amino acids without interference from side reactions, ensuring high yields and purity of the final peptide product. The S-benzyl group, on the other hand, serves to protect the thiol group of cysteine, preventing unwanted oxidation and maintaining the integrity of the peptide backbone during synthetic processes.

In recent years, there has been a growing interest in the applications of Fmoc-S-benzyl-D-cysteine in various fields of biomedical research. One notable area is its use in the development of antibody-drug conjugates (ADCs). ADCs are a class of targeted cancer therapies that combine monoclonal antibodies with cytotoxic payloads to deliver drugs directly to tumor cells. The thiol group of cysteine is often utilized as a site for conjugation due to its high reactivity and stability under controlled conditions. Fmoc-S-benzyl-D-cysteine provides an excellent scaffold for this purpose, allowing for precise modification and conjugation of therapeutic agents.

The compound has also found applications in the synthesis of protease inhibitors, which are essential in treating various diseases such as HIV, hepatitis C, and cancer. Proteases are enzymes that play critical roles in many biological processes, including viral replication and tumor growth. By inhibiting specific proteases, these drugs can effectively disrupt pathogenic mechanisms. Fmoc-S-benzyl-D-cysteine serves as a key intermediate in the synthesis of these inhibitors, providing a versatile platform for drug design and development.

Moreover, Fmoc-S-benzyl-D-cysteine has been explored in the field of bioconjugation techniques, particularly in the development of fluorescent probes and imaging agents. These probes are used to visualize biological processes at the cellular and molecular levels, aiding in diagnostic and research applications. The combination of Fmoc protection and S-benzyl modification allows for precise functionalization, enabling researchers to tailor probes for specific biological targets.

The latest advancements in synthetic methodologies have further enhanced the utility of Fmoc-S-benzyl-D-cysteine. For instance, recent studies have demonstrated its application in catalytic asymmetric synthesis, where chiral compounds are synthesized with high enantioselectivity. This approach is crucial for producing pharmaceuticals with specific stereochemical configurations that exhibit optimal biological activity. The unique properties of Fmoc-S-benzyl-D-cysteine make it an ideal candidate for such transformations, offering chemists a powerful tool for constructing complex molecular architectures.

In conclusion, Fmoc-S-benzyl-D-cysteine (CAS No. 252049-18-6) is a multifaceted compound with significant implications in peptide synthesis, bioconjugation, and drug development. Its ability to serve as a versatile intermediate in various synthetic pathways underscores its importance in modern chemistry and biomedical research. As new methodologies continue to emerge, the applications of this compound are expected to expand further, driving innovation in pharmaceuticals and biotechnology.

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