反应详情

温度

120 °C

A solution of hydrazine monohydrate (5.28 mL, 108.8 mmol) in n-butanol (20 mL) was added dropwise to a solution of N-BOC-4-methoxycarbonyl-methylenepiperidine (1.39 g, 5.44 mmol) in n-butanol (120 mL) at rt. The mixture was stirred for 15 h at 120° C. and the mixture allowed to cool to rt. The solvent was removed by evaporation under reduced pressure, the residue partitioned between ethyl acetate and water and the organic layer dried over sodium sulphate, filtered and evaporated to dryness. Purification of the residue by silica gel column chromatography, eluting with a stepwise gradient of 3-6% methanol in dichloromethane, afforded the desired compound (0.88 g, 63 %) as white solid.

1. temperatureto cool to rt
2. customThe solvent was removed by evaporation under reduced pressure
3. customthe residue partitioned between ethyl acetate and water
4. dry with materialthe organic layer dried over sodium sulphate
5. filtrationfiltered
6. customevaporated to dryness
7. customPurification of the residue by silica gel column chromatography
8. washeluting with a stepwise gradient of 3-6% methanol in dichloromethane