Synthesis of Tetrafluorinated Aromatic Amino Acids with Distinct Signatures in 19F NMR
摘要:
Fluorinated amino acids serve as powerful tools in protein chemistry. We synthesized a series of pare-substituted tetrafluorophenylalanines via the regioselective S-NAr chemistry of the commercially available pentafluorophenylalanine Boc-Z. These novel unnatural amino acids display distinct F-19 NMR signatures, making them powerful tools for analyzing protein-membrane interactions with NMR spectroscopy.
Herein we report a halogen bond-donor amino acid, 4-iodotetrafluorophenylalanine, which behaves as a catalyst for the aqueous synthesis of bis-(heterocyclic)methanes. We also provide experimental evidence that halogen bonding is a plausible explanation for the observed catalytic effect.