3-Acetylcoumarins (1) on reaction with ninhydrin (2) in acetic acid followed by treatment of in situ formed 2-hydroxy-2-[2-oxo-2-(2-oxo-2H-chromen-3-yl)-ethyl]indan-1,3-diones (3) with hydrazine hydrate resulted in the formation of corresponding 3-(2-oxo-2H-chromen-3-yl)-indeno[2,1-c]pyridazin-9-ones (4) in a single step with an excellent yields. The structures of newly synthesised compounds (4) were confirmed by unambiguous synthesis involving a two step process from 3-acetylcoumarins.
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