Desymmetrisation of biphenyl-based carbohydrate receptors: a nonbonding pillar in one corner of the cage.

[摘要]：A new addn. to the family of biphenyl-based carbohydrate receptors, derived by replacing 1 out of 4 isophthalamide (diamide) linkages with the corresponding diester, was reported. The alteration results in lower binding consts., perhaps reflecting the entropic penalty for lowering receptor symmetry. However, the synthesis allows access to many related host mols., with potential for restoring and raising affinities and tuning selectivities.

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