反应详情

2-(2-Methyl-6,7-dihydrocyclopenta[e]indazol-8(2H)-ylidene)ethanamine (400 mg, 1.88 mmol) was dissolved in tetrahydrofuran (19 mL), triethylamine (287 μL, 2.06 mmol) and acetic anhydride (195 μL, 2.06 mmol) were added under ice-cooling, and the mixture was stirred for 15 min. The reaction solution was diluted with saturated aqueous sodium hydrogen carbonate solution, diluted with ethyl acetate, washed with water and saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (methanol/ethyl acetate=0/100→10/90) to give the title compound (393 mg, yield 82%).

1. temperaturecooling
2. washwashed with water and saturated brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure
5. customthe residue was purified by silica gel column chromatography (methanol/ethyl acetate=0/100→10/90)