反应详情

To a solution of 2,4-dihydro-2-methyl-5-phenyl-3H-pyrazol-3-one (0.63 g; 3.62 mmol) in DMF (20 ml) was added 230 mg (3.96 mmol) of KF followed by 2-chloromethyl-4-isopropyl-6-methoxy-1,2-benzisothiazol-3(2H)-one 1,1-dioxide (1 g, 3.29 mmol) and the resulting mixture was stirred at room temperature for 24 hours and then poured into water. The above mixture was extracted with ethyl acetate and the organic layer was washed with water, brine, dried, and concentrated in vacuo. The residue was purified by flash chromatography to afford 0.4 g (27%) of 4-isopropyl-6-methoxy-2-(1-methyl-3-phenylpyrazol-5-yl-oxymethyl)-1,2-benzisothiazol-3(2H)-one 1,1-dioxide (Formula I: R1 =CH3 ; R2 =Ph; R3 =H; R4 =CH(CH3)2 ; R5 =6-OCH3) as a white solid, m.p. 126°-128° C.

1. extractionThe above mixture was extracted with ethyl acetate
2. washthe organic layer was washed with water, brine
3. customdried
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash chromatography