反应详情

tert-Butyl 2-amino-4-(4-methylpiperazin-1-yl)benzoate (1.5 g, 5.15 mmol) was dissolved in dry dioxane (25 mL) under a nitrogen atmosphere. N-methylpiperidone (0.72 g, 6.18 mmol, 1.2 eq) was added, followed by trifluoroacetic acid (1.03 mL, 13.39 mmol, 2.6 eq) and sodium triacetoxyborohydride (1.72 g, 7.73 mmol, 1.5 eq). The mixture was stirred at room temperature for 26 hours. During this time extra portions of N-methylpiperidone (0.5 mL, 0.75 eq) and sodium triacetoxyborohydride (1.72 g, 7.73 mmol, 1.5 eq) were added. A saturated aqueous solution of NaHCO3 was then added and the reaction mixture was concentrated under reduced pressure. 10% ammonium hydroxide was added until pH 10 and the aqueous phase was extracted with dichloromethane. The organic phase was washed with brine, dried over Na2SO4 and evaporated under reduced pressure. After purification by chromatography over silica gel (DCM/MeOH/NH3 7% in MeOH 90:8:2) 1.025 g of title compound were obtained as off-white solid (51% yield).

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. addition10% ammonium hydroxide was added until pH 10
3. extractionthe aqueous phase was extracted with dichloromethane
4. washThe organic phase was washed with brine
5. dry with materialdried over Na2SO4
6. customevaporated under reduced pressure
7. customAfter purification by chromatography over silica gel (DCM/MeOH/NH3 7% in MeOH 90:8:2) 1.025 g of title compound