Facile synthesis of novel stilbene ligands containing a 15-crown-5 ether moiety

Abstract

Novel ligands containing a 15-crown-5 ether moiety and six-membered heterocyclic residues with different combinations of N atoms were prepared by condensation of methyl-substituted six-membered heterocyclic bases with 4'-formylbenzo-15-crown-5 ether; the best results were obtained in the presence of tBuOK in DMF. For dimethyl-substituted heterocyclic bases as the initial heterocyclic components, the competition of mono-and bis-condensation reactions is analyzed. The role of complex formation in the syntheses is discussed.