Synthesis of new polydentate tweezers ligands of amido-amine type

A series of new tweezers amido-amine ligands containing pyrrole, bipyrrole, and dipyrrolylmethane fragments were synthesized by reaction of 2-thioxothiazolidin-3-yl derivatives of α-pyrrolecarboxylic acids {5-[1-(5-carboxy-3-methyl-4-phenyl-1 H -pyrrol-2-yl)-1-methylethyl]-4-methyl-3-phenyl-1 H -pyrrole-2-carboxylic acid, 5-[(5-carboxy-3-methyl-4-phenyl-1 H -pyrrol-2-yl)phenylmethyl]-4-methyl-3-phenyl-1 H -pyrrole-2-carboxylic acid, 5-(5-carboxy-3-methyl-4-phenyl-1 H -pyrrol-2-yl)-4-methyl-3-phenyl-1 H -pyrrole-2-carboxylic acid, and 3,4-dimethyl-pyrrole-2,5-dicarboxylic acid} with o -phenylenediamine. All compounds obtained were characterized by elemental analysis, NMR and mass spectra.