反应详情

5-Methyl-7-nitro-1H-indole-2-carboxylic acid methyl ester (234 mg, 1 mmol) prepared in Preparation 15 was dissolved in methanol (10 mL), to which was added hydrazine (3 mL). The reaction solution was refluxed for 3 h, and concentrated under reduced pressure. To the concentrate was added trimethylorthoformate (10 mL), and the mixture was refluxed for 8 h. The reaction mixture was distilled under reduced pressure, and the resulting solid was washed with ethyl acetate to give the title compound (49 mg, Yield 20%).

1. temperatureThe reaction solution was refluxed for 3 h
2. concentrationconcentrated under reduced pressure
3. additionTo the concentrate was added trimethylorthoformate (10 mL)
4. temperaturethe mixture was refluxed for 8 h
5. distillationThe reaction mixture was distilled under reduced pressure
6. washthe resulting solid was washed with ethyl acetate