The design, synthesis and binding studies of open-chain and macrocyclic chiral bicyclic guanidinium receptors specially designed for enantiorecognition of oxoanions are reported in this work. Two series of guanidinium hosts, one harbouring bisphenol A and another possessing estradiol side chains, were synthesized. Macrocyclic derivatives of open-chain hosts were synthesized by means of ring closing metathesis or using spacer groups. The effect of macrocyclization of hosts on their enantiorecognition ability was analysed by isothermal calorimetric titrations. The cyclized hosts gave better enantiodifferentiation in comparison to their open-chain analogues. The molecular dynamics simulation studies gave insight into the size compatibility between hosts and various oxoanion guests.
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The design, synthesis and binding studies of open-chain and macrocyclic chiral bicyclic guanidinium receptors specially designed for enantiorecognition of oxoanions are reported in this work. Two series of guanidinium hosts, one harbouring bisphenol A and another possessing estradiol side chains, were synthesized. Macrocyclic derivatives of open-chain hosts were synthesized by means of ring closing metathesis or using spacer groups. The effect of macrocyclization of hosts on their enantiorecogni...
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