The Kabachnik–Fields Reaction in the Synthesis of Polyaminophosphonate Derivatives of p-tert-Butylthiacalix[4]arene

Abstract

Novel derivatives of p-tert-butylthiacalix[4]arene containing four or eight 1-aminophosphonate groups at the lower rim of the macrocycle in 1,3-alternate conformation have been synthesized via the Kabachnik–Fields reaction. These compounds are promising synthetic receptors for biologically important acids. It has been shown that complete phosphorylation of the first generation dendrimer containing eight primary amino groups is impeded in the case of cyclic ketones.