Chiral Recognition Studies of α-(Nonafluoro- tert -butoxy)carboxylic Acids by NMR Spectroscopy

Anikó Nemes, Tamás Csóka, Szabolcs Béni, Viktor Farkas, József Rábai, Dénes Szabó

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10 Citations (Scopus)

Abstract

Three chiral α-(nonafluoro-tert-butoxy)carboxylic acids (R)-1, (RS)-2, (R)-3 were synthesized to examine their application as chiral solvating agents with amines. As a model compound, first (S)- and/or (RS)-α-phenylethylamine was used, and their diastereomeric salts were investigated by 1H and 19F NMR and ECD spectroscopy. The NMR spectroscopic studies were carried out at room temperature using the slightly polar CDCl3 and apolar C6D6 as solvents in 5 mM and 54 mM concentrations. The difference of the chemical shifts (Δδ) in the diastereomeric complexes is comparable with other, well-known chiral derivatizing and solvating agents (e.g., Mosher's acid, Pirkle's alcohol). Diastereomeric salts of racemic acids (RS)-1 and (RS)-2 with biologically active amines (1R,2S)-ephedrine and (S)-dapoxetine were also investigated by 19F NMR spectroscopy.

Original languageEnglish
Pages (from-to)6267-6274
Number of pages8
JournalJournal of Organic Chemistry
Volume80
Issue number12
DOIs
Publication statusPublished - Jun 19 2015

ASJC Scopus subject areas

  • Organic Chemistry

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