反应详情

温度

80 °C

Dimethylamine HCl (90 g, 1.1 mol), 5-methyl-2-hexanone (450 mL, 3.3 mol), and paraformaldehyde (50 g, 1.7 mol) were suspended in MeOH (80 mL) and concentrated HCl (200 μL) was added. The reaction mixture was heated to 80° C. for 12 hours. The mixture was allowed to cool to room temperature and 10% NaOH was added until basic. The entire mixture was extracted with Et2O (100 mL, 2×). The organic layer was dried over MgSO4 and concentrated. The crude reaction mixture was columned via flash column chromatography (0.5:9.5 MeOH:CH2Cl2) to give 30 g (175 mmol) of 3-dimethylaminomethyl-5-methyl-hexan-2-one 1a in a 16% yield.

1. temperatureto cool to room temperature
2. extractionThe entire mixture was extracted with Et2O (100 mL, 2×)
3. dry with materialThe organic layer was dried over MgSO4
4. concentrationconcentrated
5. customThe crude reaction mixture