反应详情

温度

-78 °C

A flame-dried round bottom flask under nitrogen was charged with dry tetrahydrofuran (17 mL) and ((3S,4S)-tetrahydro-3,4-furandiamine (170 mg, 1.70 mmol) prepared according to the procedures of Skarzewski, J., et al. Tetrahedron: Asymmetry 1997, 8 (11), 1861. The solution was cooled to −78° C., and 2.5 M n-butyl lithium in hexanes (700 μL, 1.75 mmol) was added. The resulting cloudy white suspension was warmed to 23° C., and the suspension became orange. After 10 min, tert-butyl dicarbonate (371 mg, 1.70 mmol) was added in one portion. An additional 100 mg-portion of tert-butyl dicarbonate was added after 10 min. The reaction was then poured into saturated aqueous sodium chloride (50 mL), and the aqueous layer was washed with ethyl acetate (4×20 mL). The combined organic layers were dried over sodium sulfate, concentrated, and the resulting residue was purified by flash chromatography (5–10% methanol in dichloromethane) to yield the desired amine (90 mg, 26%) as a yellow oil. MS (ESI) 203 (M+H).

1. temperatureThe resulting cloudy white suspension was warmed to 23° C.
2. washthe aqueous layer was washed with ethyl acetate (4×20 mL)
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. concentrationconcentrated
5. customthe resulting residue was purified by flash chromatography (5–10% methanol in dichloromethane)