2-Chloroanthraquinone → anthra(1,9-cd)pyrazol-6(2H)-one

Participants

Reaction Conditions

Reaction Steps

Anhydrous hydrazine is added to a solution of 2-chloroanthraquinone (Aldrich) in 10 mL pyridine, and the mixture heated at 100° C. for 16 hours. The mixture is cooled and the solvent is evaporated in vacuo. The residue is taken in hot 6N HCl, and the solid is collected by filtration. Flash chromatography of the crude material on silica gel affords anthra[1,9cd]pyrazol-6(2H)-one (“Compound 1”) as yellow solids.

Provenance & Evidence