反应详情

温度

90 °C

2-Cyclopropyl-6-(3,5-difluorophenyl)-7-fluoro-5-methyl-1,3-benzoxazole-4-carbonitrile (I-176) (including impurities, estimated as 0.68 mmol) was dissolved in dimethyl sulfoxide (5 ml), then at room temperature, triethylamine (142 μl, 1.02 mmol) and (3S)-3-(dimethylamino)pyrrolidine (112 μl, 0.88 mmol) were added, the solution was stirred under nitrogen atmosphere at 90° C. for 15 hours. After cooling to room temperature, the reaction liquid was fractionated with ethyl acetate and an aqueous saturated sodium hydrogencarbonate solution. The aqueous layer was further extracted twice with ethyl acetate. The organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate. The insoluble matter was separated by filtration, then the solvent was evaporated away, and the resulting residue was purified by preparative TLC (eluent, chloroform:methanol=96:4) to obtain a roughly-purified product (211 mg, 74% for 2 steps) as a white solid. This was recrystallized from ethyl acetate and diisopropyl ether to obtain the entitled compound (46 mg) as a white solid.

1. temperatureAfter cooling to room temperature
2. customthe reaction liquid
3. extractionThe aqueous layer was further extracted twice with ethyl acetate
4. washwashed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. customThe insoluble matter was separated by filtration
7. customthe solvent was evaporated away
8. customthe resulting residue was purified by preparative TLC (eluent, chloroform:methanol=96:4)
9. customto obtain a roughly-purified product (211 mg, 74% for 2 steps) as a white solid
10. customThis was recrystallized from ethyl acetate and diisopropyl ether