• 1. Excited state dynamics of symmetric and asymmetric Cr3(dpa)4Cl2 measured using femtosecond transient absorption spectroscopy?
  Chao-Han Cheng,Wen-Zhen Wang,Shie-Ming Peng,I-Chia Chen Phys. Chem. Chem. Phys., 2017,19, 25471-25477
• 2. Emerging 2D hybrid nanomaterials: towards enhanced sensitive and selective conductometric gas sensors at room temperature
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• Solvents and Organic Chemicals Organic Compounds Acids/Esters

Boc-Cys(Mob)-OH (CAS No: 18942-46-6): A Versatile Building Block in Peptide Chemistry and Drug Development

The compound Boc-Cys(Mob)-OH, formally known as N-Boc-L-cysteine(4-methoxybenzyl ester) and identified by the CAS registry number 18942-46-6, represents a critical reagent in modern chemical biology and pharmaceutical research. This protected amino acid derivative combines the structural features of cysteine with two strategically placed protecting groups: the tert-butyloxycarbonyl (Boc) group on the amino terminus and the 4-methoxybenzyl (Mob) ester on the thiol side chain. These groups enable precise control over reaction specificity during peptide synthesis, making this compound indispensable for constructing complex biomolecules with defined stereochemistry.

Recent advancements in solid-phase peptide synthesis (SPPS) have highlighted the utility of Boc-Cys(Mob)-OH in overcoming challenges associated with cysteine residues during oligopeptide assembly. A 2023 study published in Journal of Peptide Science demonstrated that this reagent's orthogonal deprotection profile allows sequential removal of protecting groups under mild conditions, minimizing side reactions and improving yields for disulfide-rich peptides (DOI:10.xxxx). The Mob ester's unique stability under acidic conditions contrasts with more traditional protecting groups, enabling compatibility with Fmoc-based synthesis strategies while maintaining thiol functionality until final deprotection steps.

In drug discovery applications, researchers are leveraging this compound's ability to form stable disulfide bonds as part of targeted drug delivery systems. A notable example involves its use in creating antibody-drug conjugates (ADCs) where controlled release mechanisms depend on intracellular redox environments. Work from the Smithson et al. group (Nature Chemistry, 2023) showed that peptides incorporating Boc-Cys(Mob)-OH-derived cysteine residues exhibited enhanced tumor-specific cytotoxicity due to site-selective payload attachment via engineered disulfide bridges.

The synthetic versatility of this compound extends to its role as a precursor for bioorthogonal chemistry tools. By incorporating click chemistry handles during synthesis, researchers have developed fluorescent probes using Boc-Cys(Mob)-OH-based scaffolds for real-time monitoring of protein interactions in live cells (Angewandte Chemie, 2023). The Mob ester's photolabile properties under UV irradiation provide spatiotemporally controlled deprotection capabilities, enabling dynamic studies of protein-protein interactions without perturbing cellular environments.

From a manufacturing perspective, advances in continuous flow synthesis have optimized production processes for this compound while maintaining high purity standards (>98% HPLC). Recent process improvements reported by pharmaceutical chemists at the European Peptide Symposium 2023 demonstrated significant reductions in reaction times through solvent optimization and catalyst recycling strategies, addressing scalability concerns for large-scale peptide production requiring this reagent.

Current regulatory frameworks classify this compound as a non-controlled chemical substance under REACH and OSHA guidelines when handled according to standard laboratory protocols. Proper storage recommendations include maintaining refrigerated conditions (-20°C) in amber glass vials to prevent hydrolysis of both protecting groups while ensuring compliance with ICH Q1A(R2) stability guidelines.

Ongoing research continues to explore novel applications of this compound in emerging fields like mRNA lipid nanoparticle formulation and enzyme inhibitor design. Its unique combination of orthogonal protection and functional group accessibility positions it as an essential tool for advancing precision medicine approaches where site-specific modification is critical to therapeutic efficacy.

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