Chlorosulfonic acid → HCID 15457058, compound

Participants

Reaction Conditions

Reaction Steps

2.9 g (9.5 mmol) of 3-(4-chloro-2-fluorophenyl)-1-methyl-6-trifluoromethyl-2(1H)-pyridone was dissolved in 70 g of chlorosulfonic acid, followed by heating and stirring at 100° C. for 5 hours. After cooling, the mixture was gradually dropwise added to ice water, followed by extraction with ethyl acetate. After washing with water and a saturated sodium hydrogencarbonate aqueous solution, the organic layer was dried over anhydrous magnesium sulfate. Ethyl acetate was distilled off under reduced pressure. Then, the obtained crude crystals were washed with n-hexane to obtain 3.3 g (yield: 86%) of the desired product. Melting point: 77-78° C.

Provenance & Evidence