Potassium Fluoride → 4-isopropyl-6-methoxy-2-[1-(4-methoxyphenyl)-3-trifluoromethylpyrazol-5-yl-oxymethyl)-1,2-benzisothiazol-3(2H)-one 1,1-dioxide

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(4-methoxyphenyl)-3-trifluoromethyl-5-hydroxy pyrazole (489 mg; 1.89 mmol), 2-bromomethyl-4-isopropyl-6-methoxy-1,2-benzisothiazol-3(2H)-one 1,1-dioxide (600 mg, 1.72 mmol), and KF (200 mg; 3.44 mmol) in DMF (8 ml) was stirred at 20° C. for 2 hours and the mixture was diluted with water. The above mixture was extracted with ether (3×) and the organic layer was dried over sodium sulfate, and concentrated in vacuo. The residue was purified by column chromatography (silica gel; 25-50% ethyl acetate/hexane) and recrystallized from ethyl acetate/hexane to afford 418 mg (46%) of 4-isopropyl-6-methoxy-2-[1-(4-methoxyphenyl)-3-trifluoromethylpyrazol-5-yl-oxymethyl)-1,2-benzisothiazol-3(2H)-one 1,1-dioxide (Formula I: R1 =4-CH3O--Ph; R2 =CF3 ; R3 =H; R4 =CH(CH3)2 ; R5 =6-OCH3) as a white solid, m.p. 111°-113° C.

Provenance & Evidence