反应详情

To a solution of the compound (1) (2.52 g, 9.79 mmol) obtained above and triethylamine (9.5 ml, 68 mmol) in dimethyl sulfoxide (25 ml) was added a solution of sulfur trioxide-pyridine complex (4.67 g, 29.3 mmol) in dimethyl sulfoxide (25 ml), and the reaction mixture was stirred at room temperature for 30 minutes. To the reaction mixture was added a saturated aqueous solution of sodium hydrogencarbonate, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was distilled off, and thus obtained brown solid was purified by column chromatography on silica gel to give pale green needle-like crystals. Yield 1.93 g (77%).

1. extractionthe mixture was extracted with ethyl acetate
2. washThe extract was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationThe solvent was distilled off
5. customthus obtained brown solid was purified by column chromatography on silica gel
6. customto give pale green needle-like crystals