反应详情

Sulfur trioxide pyridine complex (720 mg, 4.5 mmol) was added to a solution of 3-[3-(benzo-2,1,3-thiadiazole-4-sulfonyloxy)-5-methylphenoxy]propanol (565 mg, 1.5 mmol), as prepared in the preceding step, N,N-diisopropylethylamine (0.6 mL, 4.7 mmol) and anhydrous dimethyl sulfoxide (0.3 mL, 4.2 mmol) in anhydrous dichloromethane (15 mL). The reaction mixture was stirred at ambient temperature for 1 hour and then quenched with 10% aqueous citric acid (50 mL). The mixture was extracted into dichloromethane (3×50 mL), and the dichloromethane solution was washed with 10% aqueous citric acid (40 mL) and dried over Na2SO4. After removing the solvent in vacuo, the residue was purified by flash column chromatography (dichloromethane) to give the title compound as a pale yellow oil (450 mg, 80%). 1H-NMR (300 MHz, CDCl3) δ 9.82 (s, 1H), 8.35 (d, J=8.7 Hz, 1H), 8.27 (d, J=7.1 Hz, 1H), 7.72 (t, J=8.6 Hz, 1H), 6.59 (s, 1H), 6.49 (s, 1H), 6.44 (s, 1H), 4.17 (t, J=6.0 Hz, 2H), 2.85 (t, J=6.0 Hz, 2H), 2.21 (s, 3H).

1. customquenched with 10% aqueous citric acid (50 mL)
2. extractionThe mixture was extracted into dichloromethane (3×50 mL)
3. washthe dichloromethane solution was washed with 10% aqueous citric acid (40 mL)
4. dry with materialdried over Na2SO4
5. customAfter removing the solvent in vacuo
6. customthe residue was purified by flash column chromatography (dichloromethane)