Hydrazine hydrate (1:1) → 4-(2,6-difluorophenyl)-6-methyl-5-phenyl-2H-pyridazin-3-one

Participants

Reaction Conditions

Reaction Steps

0.60 g of hydrazine monohydrate was added dropwise to a mixture of 2.83 g of 3-(2,6-difluorophenyl)-5-hydroxy-5-methyl-4-phenyl-2(5H)-furanone and 15 ml of 1-butanol, followed by stirring at a bath temperature of 110° C. for 2.5 hours. Next, the reaction mixture was cooled to 0° C. The obtained solid was collected by filtration. The collected solid was washed with a mixed solvent (1:1) of hexane and t-butyl methyl ether, and dried under reduced pressure, thereby obtaining 1.70 g of 4-(2,6-difluorophenyl)-6-methyl-5-phenyl-2H-pyridazine-3-one. 1H-NMR (DMSO-d6, TMS) δ (ppm): 2.02 (3H, s), 6.92-6.98 (2H, m), 7.11-7.12 (2H, m), 7.27-7.36 (4H, m), 13.2 (1H, br s)

Provenance & Evidence