Synthesis of Perfluoro-tert-butyl Tyrosine, for Application in ¹⁹F NMR, via a Diazonium-Coupling Reaction.

ABSTRACT: A practical synthesis of the novel highly fluorinated amino acid Fmoc-perfluoro-tert-butyl tyrosine was developed. The sequence proceeds in two steps from commercially available Fmoc-4-NH₂-phenylalanine via diazotization followed by diazonium coupling reaction with perfluoro-tert-butanol. In peptides, perfluoro-tert-butyl tyrosine was detected in 30 s by NMR spectroscopy at 500 nM peptide concentration due to nine chemically equivalent fluorines that are a sharp singlet by ¹⁹F NMR. Perfluoro-tert-butyl ether has an estimated σ_p Hammett substituent constant of +0.30.

SUBMITTER: Tressler CM 

PROVIDER: S-EPMC6354588 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature