title: Synthesis and application of N-[1-(4-(4-fluorophenyl)-2,6-dioxocyclohexylidene)ethyl] (Fde)-protected amino acids for optimization of solid-phase peptide synthesis using gel-phase (19)F NMR spectroscopy.
abstract: N-[1-(4-(4-fluorophenyl)-2,6-dioxocyclohexylidene)ethyl] (Fde) protected amino acids have been prepared and applied in solid-phase peptide synthesis monitored by gel-phase (19)F NMR spectroscopy. The Fde protective group could be cleaved with 2% hydrazine or 5% hydroxylamine solution in DMF as determined with gel-phase (19)F NMR spectroscopy. The dipeptide Ac-L-Val-L-Val-NH(2) 12 was constructed using Fde-L-Val-OH and no noticeable racemization took place during the amino acid coupling with N,N'-diisopropylcarbodiimide and 1-hydroxy-7-azabenzotriazole or Fde deblocking. To extend the scope of Fde protection, the hydrophobic nonapeptide LLLLTVLTV from the signal sequence of mucin MUC1 was successfully prepared using Fde-L-Leu-OH at diagnostic positions.
authors.affiliation: Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Maciej
authors.initials: M
authors.lastname: Pudelko
authors.forename: Weixing
authors.initials: W
authors.lastname: Qian
authors.forename: Mikael
authors.initials: M
authors.lastname: Elofsson
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D005461:Fluorine; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000596:Amino Acids; D007202:Indicators and Reagents; D009842:Oligopeptides; D005461:Fluorine