反应详情

Ethyl 3-(5-amino-2-chlorobenzoylamino)propionate (122.8 mg, 0.45 mmol) was stirred with a dimethylformamide solution of thiocarbonyldiimidazole (0.1 M, 4.5 mL) at room temperature for 1 hour and with a dimethylformamide solution of 3-(1-hydrazonoethyl)-1-methyl-5-[4-(trifluoromethyl)phenyl]-1H-pyrazol-4-ol prepared in Reference Synthetic Example 14 (0.1 M, 3.0 mL) at room temperature for 6 hours. Water (3.0 mL) was added, and the precipitated solid was removed by filtration. The filtrate was separated by thin layer chromatography to give 57.0 mg of a crude product. An ethanol solution (1.0 mL) of the crude product (26.0 mg, 0.0435 mmol) was stirred with 1 M aqueous sodium hydroxide (131 μL, 0.131 mmol), and the precipitated solid was collected by filtration, washed with water and dried to give 14.6 mg of the desired product (yield 20%).

1. customthe precipitated solid was removed by filtration
2. customThe filtrate was separated by thin layer chromatography
3. customto give 57.0 mg of a crude product
4. filtrationthe precipitated solid was collected by filtration
5. washwashed with water
6. customdried