Hydrochloric Acid → 5-[(2,6-diethyl-4-methylphenyl)carbonyl]-3-(4-fluorophenyl)-1-methyl-4-methylsulfonyl-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

To a 10 ml volume two-necked flask, 1-[2-(2,6-diethyl-4-methylphenyl)-2-oxoacetyl]-2-[1-(4-fluorophenyl)-2-methylsulfonylethylidene]-1-methyl-2-oxoacetohydrazide ((4-64)-(1)-39) (0.66 g) and methanol (2.5 ml) were added under a nitrogen atmosphere. To the mixture, lithium hydroxide monohydrate (62 mg) was added under cooling on −5° C. bath, and stirred under ice-cooling for 4 hours. After cold dilute hydrochloric acid was added under ice-cooling, the mixture was added to cold water, and extracted with ethyl acetate 3 times. The organic layers were washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was subjected to column chromatography (hexane: ethyl acetate=3:1) to give 0.31 g of 4-(2,6-diethyl-4-methylphenyl)-6-(4-fluorophenyl)-2-methyl-5-methylsulfonyl-2,3-dihydro-3-pyridazinone ((2-64)-(1)-39) and 0.12 mg of 5-[(2,6-diethyl-4-methylphenyl)carbonyl]-3-(4-fluorophenyl)-1-methyl-4-methylsulfonyl-1H-pyrazole (22-b).

Provenance & Evidence