反应详情

温度

120 °C

To 6-amino-2,2-dimethylchromene (1.00 g, 5.71 mmol), 35% hydrochloric acid (1.43 mL, 17.1 mmol), p-chloranil (1.40 g, 5.71 mmol) and n-butanol (1.3 mL) were added at room temperature and the temperature was increased to 120° C. A solution of crotyl aldehyde (0.567 mL, 6.84 mmol) in n-butanol (0.52 mL) was added and the resulting mixture was stirred at 120° C. for 20 minutes. A solution of zinc chloride (0.777 g, 5.71 mmol) in tetrahydrofuran (10 mL) was added, and the resulting mixture was stirred at 120° C. for 20 minutes. Upon the completion of the reaction, aqueous sodium hydrogencarbonate solution was added, and the resulting solution was extracted with ethyl acetate and dried over anhydrous magnesium sulfate. After distilling off the solvent, the residue was purified by column chromatography (hexane/ethyl acetate=2/1), and recrystallized from ethyl acetate to obtain the aimed product (yield: 22%).

1. stirringthe resulting mixture was stirred at 120° C. for 20 minutes
2. additionwas added
3. extractionthe resulting solution was extracted with ethyl acetate
4. dry with materialdried over anhydrous magnesium sulfate
5. distillationAfter distilling off the solvent
6. customthe residue was purified by column chromatography (hexane/ethyl acetate=2/1)
7. customrecrystallized from ethyl acetate