反应详情

温度

45 °C

N-(4-biphenylsuifonyl )-N-(4-bromo- 3-methyl- 5-isoxazolyl)-4-biphenylsulfonamide (0.150 g, 0.233 mmol) was dissolved in tetrahydrofuran (THF). Sodium hydroxide (0.120 g, 3.0 mmol) was added and the solution was warmed to 45° C. to dissolve the sodium hydroxide. Stirring was continued for 20 min. Tetrahydrofuran was removed under reduced pressure. The residue was dissolved in water, cooled to 0° C. and acidified to pH 3-4 with concentrated HCl. The solid precipitate was filtered off and dried in vacuo to give N-(4-bromo-3-methyl-5-isoxazolyl)-4-biphenylsulfonamide (94% yield), which was further purified by recrystallization from chloroform/hexanes, m.p. 133°-135° C.

1. customTetrahydrofuran was removed under reduced pressure
2. dissolutionThe residue was dissolved in water
3. temperaturecooled to 0° C.
4. filtrationThe solid precipitate was filtered off
5. customdried in vacuo