反应详情

To a solution of 4-{[4-methyl-3-(methyloxy)phenyl]oxy}aniline (Intermediate 11, 336 mg, 1.467 mmol) in DCM (50 mL) Triethylamine (296 mg, 2.93 mmol) was added followed by triphosgene (174 mg, 0.587 mmol). The reaction mixture was stirred at room temperature for 0.5 h. Triethylamine (296 mg, 2.93 mmol) and acetohydrazide (130 mg, 1.76 mmol) were then added and the reaction mixture was stirred at room temperature overnight. The solvent was concentrated in vacuum and the residue was dissolved in a 2M aqueous solution of NaOH (15 mL) and the mixture was heated to reflux for 12 h. The reaction mixture was neutralized with aqueous 6M HCl to pH=7 and extracted with DCM (3×50 mL). The combined organic phases were dried over Na2SO4 and concentrated under reduced pressure to give the crude product which was purified by flash chromatography on silica gel using dichloromethane/methanol as eluents from 100/1 to 50/1 to yield 150 mg of the title compound.

1. stirringthe reaction mixture was stirred at room temperature overnight
2. concentrationThe solvent was concentrated in vacuum
3. dissolutionthe residue was dissolved in a 2M aqueous solution of NaOH (15 mL)
4. temperaturethe mixture was heated
5. temperatureto reflux for 12 h
6. extractionextracted with DCM (3×50 mL)
7. dry with materialThe combined organic phases were dried over Na2SO4
8. concentrationconcentrated under reduced pressure
9. customto give the crude product which
10. customwas purified by flash chromatography on silica gel