反应详情

t-butyl 2-[dihydrofuran-3(2H)-ylidene]hydrazinecarboxylate (17.26 g) was suspended in water (130 mL). Acetic acid (57.2 mL) was added to the suspension at room temperature. The mixture was stirred at room temperature for one hour. Sodium cyanoborohydride (5.36 g) was added to the solution in small portions. The mixed solution was stirred at room temperature for two hours. The reaction mixture was cooled to 0° C. The reaction mixture was neutralized by adding a 5 N aqueous sodium hydroxide solution. The mixture was extracted with chloroform. The organic layer was dried over anhydrous magnesium sulfate and then filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (5% methanol/ethyl acetate). The title compound (15.3 g) was obtained.

1. stirringThe mixed solution was stirred at room temperature for two hours
2. temperatureThe reaction mixture was cooled to 0° C
3. extractionThe mixture was extracted with chloroform
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationThe filtrate was concentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (5% methanol/ethyl acetate)