Sweet anion receptors: recognition of chiral carboxylate anions by D-glucuronic-acid-decorated diindolylmethane.

Anion receptors containing glucuronic acid were synthesized, and their anion binding ability studied. Chirality of anionic guests derived from mandelic acid and amino acids can be distinguished not only in terms of stability constants but also by significant differences in chemical shift changes for sugar moiety protons.