A FACILE SYNTHESIS OF IMIDAZO[1,5-b]PYRIDAZINES FROM 3-FORMYLCHROMONES

- The recyclization of 3-formylchromones promoted by chlorotrimethylsilane with 1-amino-1H-imidazoles results in a set of imidazo[1,5-b]pyridazines is obtained in high preparative yields. It's found that the reaction is sensitive to the structure of NNC-binucleophiles.