Benzoylhydrazine → HCID 10198473, compound

Participants

Reaction Steps

2.5 g (11 mmol) of 5-(2-fluorobenzoyl)furan-2-carboxylic acid, 3.28 g (24 mmol) of benzhydrazide and 2 drops of glacial acetic acid in 50 ml of ethanol were heated under reflux for 10 h. The mixture was subsequently concentrated using a rotary evaporator and the residue was taken up in water, made alkaline using 2 N NaHCO3 solution and extracted with ethyl acetate. The aqueous phase was made acidic using 2 N hydrochloric acid and extracted with ethyl acetate. The combined organic phases were dried and concentrated using a rotary evaporator. The residue was dissolved in 25 ml of THF, 2.74 g (24.2 mmol) of potassium tert-butoxide were added and the mixture was stirred at reflux temperature for 1.5 h. After cooling, the mixture was concentrated using a rotary evaporator and the residue was taken up in 1 N aqueous sodium hydroxide solution and extracted with ethyl acetate. The precipitate that resulted when the aqueous phase was acidified was filtered off with suction, washed with water and dried in a vacuum drying cabinet at 40° C. This gave 1.88 g (75%) of the title compound. m.p.: 205° C. (decomp).

Provenance & Evidence