Ring-chain transformation of 4-aroyl-5-phenylamino-2,3-dihydrothiophene-2,3-diones: Facile and efficient synthesis of novel pyrrolo2,3-cpyrazol-3(2H)-ones and 1,2-dihydro-5H,6H-pyridazine-5,6-diones

摘要

Seven, novel pyrrolo2,3-cpyrazol-3(2H)-one and 1,2-dihydro-5H,6H-pyridazine-5,6-dione chromophores were synthesized by the reaction of 4-aroyl-5-phenylamino-2,3-dihydrothiophene-2,3-diones with cyanoacetohydrazide and arylhydrazines such as phenylhydrazine and 4-nitrophenylhydrazine. These derivatives were characterized by elemental analysis, IR, UV-Visible, H-1, C-13 NMR and mass spectroscopy. Spectral characteristics of the compounds were studied in four organic solvents of differing polarity.