Nα-Fmoc-O, O-(dimethylphospho)-L-tyrosine fluoride: A convenient building block for the solid-phase synthesis of phosphotyrosyl peptides

Summary

Fmoc-O,O-(dimethylphospho)-l-tyrosine was converted into stable Fmoc-O,O-(dimethylphospho)-L-tyrosine fluoride by means of (diethylamino) sulfur trifluoride or cyanuric fluoride. This building block was used for efficient coupling of phosphotyrosine to the adjacent sterically hindered amino acid Aib or Ac6c in, model peptide sequences as well as for the synthesis of the ‘difficult’ phosphotyrosine peptide Stat91695–708. The phosphate methyl groups were cleaved on solid phase after peptide assembly by means of trimethylsilyl iodide in MeCN.

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Additional information

Aib, α-aminoisobutyric acid Ac6c, 1-amino-cyclohexyl-l-carboxylic acid; BOP, benzotriazol-l-yl-oxy-tris(dimethylamino) phosphonium hexafluorophosphate, CIP, 2-chloro-l, 3-dimethylimidazolidium hexafluorophosphate, DAST, (diethylamino)sulfur trifluoride; DBU 1,8-diazabicyclo[5.4.0]undec-7-ene; DCM, dichloromethane; DIEA, drisopropylethylamine; DMA dimethylacetamide; Fmoc, 9-fluorenylmethoxycarbonyl; HATU,O-(7-azabenzotriazol-l-yl)-1.1,3,3-tetramethyluronium hexafluorophosphate; HOAt, I-hydroxy-7-azabenzotriazole; HOBt,N-hydroxybenzotriazole; HPLC, high-performance liquid chromatography; MBHA, 4-methylbenzhydrylamine; MeCN, acetonitrile; NMP,N-methyl-2-pyrrolidinone; NMR, nuerear magnetic resonance; PS, polystyrene; PyBroP, bromotris(pyrrolidino)phosphonium hexafluorophosphate; Rink amide MBHA-PS, 4-(2′,4′-dimethoxyphenyl-Fmoc-aminophenyl)-phenoxyacetamido-norleucyl-MBHA-PS; TFA, trifluoroacetic acid; TMSI, trimethylsilyl iodide; TPTU, 2-(2-pyridon-l-yl)-1,1,3,3-tetramethyluroniumfluoroborate; tR, retention time; UNCA, arethane-protected amino acidN-carboxy anhydride Abbreviations for amino acids and nomenclature of, peptide structures follow the recommendations of the IUPAC-IUB Commission on Biochemical Nomenclature [Eur. J. Biochem., 138 (1984) 9].

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Fretz, H. Nα-Fmoc-O, O-(dimethylphospho)-L-tyrosine fluoride: A convenient building block for the solid-phase synthesis of phosphotyrosyl peptides. Lett Pept Sci 4, 171–176 (1997). https://doi.org/10.1007/BF02443530

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Keywords

  • Amino acid fluoride
  • TPTU
  • Peptide-bond formation
  • Dialkyl amino acids