Chiral Fluorescent Receptors based on Amino Acid Unit: Synthesis and Their Enantioselective Recognition

Three chiral fluorescent receptors (1, 2 and 3) were synthesized and their structures were characterized by IR, 1H NMR, 13C NMR, MS spectra and elemental analysis. The enantioselective recognition of receptors 1, 2 and 3 were studied by fluorescence spectra and 1H NMR spectra. The results demonstrate that receptors 1, 2 and 3 with the N-Boc-protected phenylalanine anion formed a 1:1 complex. The receptor 3 exhibits good enantioselective recognition ability toward the enantiomers of the N-Boc-protected phenylalanine anion.