反应详情

温度

80 °C

To a suspension of estrone (11, 5.40 g, 20 mmol) in EtOH (100 mL) and benzene (60 mL) were added paraformaldehyde (0.600 g, 20 mmol) and N,N,N',N'-tetramethyldiaminomethane (5.5 mL, 40 mmol), and stirred for 20 h at 80° C. After the reaction mixture was cooled to 0° C., 5 N HCl was added. The aqueous layer was washed with Et2O, and basified with aqueous NH4OH. The precipitate was collected by filtration and washed with H2O, and recrystallized from EtOH to afford 4.37 g of 72 (67% yield) mp: 172-173° C.

1. temperatureAfter the reaction mixture was cooled to 0° C.
2. washThe aqueous layer was washed with Et2O
3. filtrationThe precipitate was collected by filtration
4. washwashed with H2O
5. customrecrystallized from EtOH