Dimethylformamide dimethyl acetal → (Z)-tert-butyl 3-((dimethylamino)methylene)-4-oxopyrrolidine-1-carboxylate
反応式
[O:1]=[C:2]1[CH2:6][CH2:5][N:4]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[CH2:3]1.[CH3:14][N:15]([CH:17](OC)OC)[CH3:16]>C1COCC1>[CH3:14][N:15](/[CH:17]=[C:6]1/[CH2:5][N:4]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[CH2:3][C:2]/1=[O:1])[CH3:16]参加物
4
反応条件
- 温度
- 67.5 °C
実験手順
A solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (53.4 kg, 288 mol) in THF (133 kg) was treated with DMF-DMA (103 kg, 864 mol) in THF (472 kg) and heated at 65-70° C. under nitrogen for 20 h. The solution was cooled, evaporated under reduced pressure and solvent switched under distillation to cyclohexane. The resulting slurry was then filtered, cake washed with cyclohexane, and then water. The solids were then dried under vacuum at 35-40° C. to give tert-butyl (3Z)-3-[(dimethylamino)methylene]-4-oxopyrrolidine-1-carboxylate.