Unusual Intramolecular Bridging Reaction in Thiacalix[4]arene Series

Regio- and stereoselectivity of spirodienone formation in 2,14-dithiacalix[4]arene

Within the mixed-bridge system the thiacalixarene fragment (Ar–S–Ar) is much more prone to spirocyclization than the calixarene one (Ar–CH₂–Ar).

Allosteric binding properties of a 1,3-alternate thiacalix[4]arene-based receptor having phenylthiourea and 2-pyridylmethyl moieties on opposite faces

Thiacalix[4]arene receptors with two thiourea moieties and two 2-pyridyl moieties exhibited a heteroditopic dinuclear receptor with F− and Ag+ ions by a positive allosteric effect.

Furo[3,2-c]coumarins carrying carbon substituents at C-2 and/or C-3. Isolation, biological activity, synthesis and reaction mechanisms

The isolation, biological activity and synthesis of natural furo[3,2-c]coumarins are presented, covering mainly the developments in the last 35 years. The most relevant approaches toward the synthesis of 2-substituted, 3-substituted and 2,3-disubstituted heterocycles are also discussed, with emphasis on the efficiency of the processes and their mechanisms.

Inherent chirality through a simple dialkylation of 2,14-dithiacalix[4]arene

Dialkylation of 2,14-dithiacalix[4]arene offers the most straightforward way to inherently chiral calixarene-based macrocycles.

Unexpected cleavage of thiacalix[4]arene sulfoxides

Thiacalix[4]arene monosulfoxides possess an unprecedented reactivity towards n-BuLi to form unusual linear structures.

A study of anion binding behaviour of 1,3-alternate thiacalix[4]arene-based receptors bearing urea moieties

Thiacalix[4]arene receptors with two urea moieties exhibited a high affinity towards all of the selected anions.

Arylation of thiacalix[4]arenes using organomercurial intermediates

Direct mercuration of thiacalix[4]arenes immobilized in the cone or 1,3-alternate conformations followed by Pd-catalyzed arylation was applied to achieve either meta- or para-substitution of basic skeletons.

Positive and negative allosteric effects of thiacalix[4]arene-based receptors having urea and crown-ether moieties

Allosteric binding behaviors of heteroditopic receptors bearing the 1,3-alternate conformation based thiacalix[4]arene have been evaluated by absorption and ¹H NMR titration experiments.

Chiral anion recognition by a ureido-thiacalix[4]arene ligand immobilized in the 1,3-alternate conformation

Tetranitrothiacalix[4]arene can be easily transformed into 1,3-alternatetetraalkoxy derivatives using the Mitsunobu reaction. The introduction of chiral alkyl groups leads to a receptor capable of chiral recognition of anions.