反应详情

温度

50 °C

5-Amino-2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran (2.00 g, 9.74 mmol) and p-toluenesulfonyl chloride (2.04 g, 10.7 mmol) were dissolved in pyridine (30 ml) and stirred at 50° C. for 1 hour. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in chloroform. The mixture was washed with 1N hydrochloric acid and saturated saline and dried and then the solvent was distilled off under reduced pressure. The residue was purified by column chromatography on silica gel (hexane-ethyl acetate, 97:3). The crude crystals were recrystallized from dichloromethane-isopropyl ether to obtain the desired compound (2.41 g, yield: 68.8% yield), m.p. 219°-220° C. (dichloromethane-isopropyl ether).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. dissolutionthe residue was dissolved in chloroform
3. washThe mixture was washed with 1N hydrochloric acid and saturated saline
4. customdried
5. distillationthe solvent was distilled off under reduced pressure
6. customThe residue was purified by column chromatography on silica gel (hexane-ethyl acetate, 97:3)
7. customThe crude crystals were recrystallized from dichloromethane-isopropyl ether