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, H-1 NMR, C-13 NMR, MS spectra and elemental analysis. The enantioselective recognition of receptors 1, 2 and 3 were studied by fluorescence spectra and H-1 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.