Journal
ORGANIC LETTERS
Volume 18, Issue 24, Pages 6240-6243Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.6b02858
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Funding
- NSF [CHE-1412978]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1412978] Funding Source: National Science Foundation
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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 F-19 NMR. Perfluoro-tert-butyl ether has an estimated a Hammett substituent constant of +0.30.
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