反应详情

温度

78 °C

2-tert-Butyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.715 g, 1.717 mmol) and ethyl formate (0.43 mL, 5.32 mmol) were dissolved in anhydrous ethanol (5.00 mL). The resulting solution was treated in dropwise fashion with a 21 wt % solution of sodium ethoxide in ethanol (2 mL, 5.357 mmol). This reaction mixture was heated at 78° C. for 1 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 pale orange precipitate. The suspension was filtered yielding an orange solid as the pure 2-tert-Butyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(3-hydroxymethylene-2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide (0.412 g, 0.927 mmol, 54%).

1. customproducing a black oil
2. temperatureSubsequently, the reaction mixture was cooled to room temperature
3. filtrationThe suspension was filtered