反应详情

温度

78 °C

3-Methyl-furan-2-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (1.200 g, 3.33 mmol) and ethyl formate (0.8 mL, 9.95 mmol) were dissolved in anhydrous ethanol (30 mL). The resulting solution was treated in dropwise fashion with a 21 wt % solution of sodium ethoxide in ethanol (6.2 mL, 16.63 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 light yellow precipitate. The suspension was filtered and the solids were washed with 0° C. EtOH to afford the pure 3-Methyl-furan-2-carboxylic acid [3-(3-hydroxymethylene-2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.931 g, 2.4 mmol, 72%).

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