Imidazole derivatives. Part V. Imidazo[1',2':1,6]pyrido[2,3-d]pyridazine: synthesis, structure, and preliminary chemistry of a novel heterocyclic ring system.
Title compds. I (R = R1 = H, R2 = Ph, 4-MeOC6H4) were prepd. by cycloaddn. of 1-(arylacetyl)imidazoles with MeO2CC.tplbond.CCO2Me, followed by annulation of the imidazopyridinedicarboxylate II with H2NNH2. I (R2 = Ph) was dimethylated with CH2N2 to give I and III (R = R1 = Me) and acetylated with Ac2O to give I and III (R = COMe, R1 = H). The crystal structure of I (R = R1 = Me, R2 = Ph) was detd. by x-ray anal.
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