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Beilstein J. Org. Chem. 2020, 16, 2999–3007, doi:10.3762/bjoc.16.249
Graphical Abstract
Figure 1: Design of chiral calix[4]arene-based receptors for anions.
Scheme 1: Synthesis of the calix[4]arene-based chiral anionic receptors 7 and 8.
Figure 2: X-ray structure of 4a: (a) Top view into the cavity. (b) Side view of the same cavity.
Figure 3: X-ray structure of 7a: (a) Hydrogen bonding interactions (black) in a dimeric motif, chalcogen inte...
Figure 4: X-ray structure of 7d, showing hydrogen bonds between the ureido units (green) and hydrogen bonding...
Figure 5: 1H NMR titration of 7c with N-acetyl-ᴅ-phenylalaninate and N-acetyl-ʟ-phenylalaninate (as TBA salts...