[EN] NEW CALIX ARENE COMPOUNDS, THEIR PROCESS OF PREPARATION AND THEIR USE, PARTICULARLY AS ENZYMATIC MIMES [FR] NOUVEAUX COMPOSES DE CALIX ARENES, LEUR PROCEDE DE PREPARATION ET LEUR UTILISATION, NOTAMMENT EN TANT QUE MIMES ENZYMATIQUES
aim of designing graftablecalix[6]tren-based receptors, calix[6]trenamides decorated with an appended functional arm were synthesized through [1+1] macrocyclization reactions between calix[6]trisamines and NTA-lysine derivatives. NMR spectroscopy and ESI-MS studies showed that one of these calix[6]trenamides, 5, behaves as a unique heteroditopic receptor towards charged or neutral species. Notably
The ipso-nitration of calix[6]arene-based molecular receptors is a important synthetic pathway for the elaboration of more sophisticated systems. This reaction has been studied for a variety of capped calixarenes, and a general trend for the regioselective nitration of three aromatic units out of six in moderate to high yield has been observed. This selectivity is, in part, attributed to the electronic connection between the protonated cap at the small rim and the reactive sites at the large rim. In addition, this work highlights the fact that subtle conformational properties can drastically influence the outcome of this reaction.