反应详情

温度

78 °C

3-Methyl-isoxazole-4-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.935 g, 2.59 mmol) and ethyl formate (0.621 mL, 7.72 mmol) were dissolved in anhydrous ethanol (25 mL). The resulting solution was treated in dropwise fashion with a 21 wt % solution of sodium ethoxide in ethanol (4.83 mL, 12.94 mmol). This reaction mixture was heated at 78° C. for 0.5 h, producing a black oil. Subsequently, the reaction mixture was cooled to room temperature, and then the reaction pH was adjusted to pH 1 with dropwise addition of 1M HCl(aq) causing the formation of a brown precipitate. The suspension was filtered and the solids were washed with 0° C. EtOH to afford the pure 3-Methyl-isoxazole-4-carboxylic acid [3-(3-hydroxymethylene-2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.232 g, 0.595 mmol, 23%).

1. customproducing a black oil
2. temperatureSubsequently, the reaction mixture was cooled to room temperature
3. filtrationThe suspension was filtered
4. washthe solids were washed with 0° C