p-Toluenesulfonic acid monohydrate → HCID 18354785, compound

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Reaction Steps

1-(2,6-dichloro-4-trifluoromethylphenyl)-5-dimethylamino-4-trifluoromethylsulfinyl-3-pyrazolecarboxamide oxime 0.59 g (1.18 mmol) was dissolved in 5 ml of trimethyl orthoformate, and then 5 mg of p-toluenesulfonic acid monohydrate was added. After the mixture was was stirred at room temperature for 3 hrs, trimethyl orthoformate was distilled off in vacuo, and then added 40 ml of ethyl acetate. The ethyl acetate solution was washed twice with 15 ml of aqueous saturated sodium hydrogencarbonate solution, and then once with 15 ml of aqueous saturated sodium chloride solution. After drying over anhydrous magnesium sulfate, the solvent was distilled off to obtain 583 mg (1.15 mmol) of the title compound as a colorless crystal. Yield 97%.

Provenance & Evidence