反应详情

温度

0 °C

Dissolve 6-hydroxy-N-methoxy-N-methyl-nicotinamide (1.89 g, 10.4 mmol) in anhydrous THF (40 mL), then cool the solution to 0° C. Add isobutyl magnesium chloride (16 mL, 32 mmol, 2M solution in diethyl ether) under nitrogen, allow the mixture to warm gradually to room temperature and then stir for 16 h. Quench the reaction with 1M aqueous HCl and concentrate the mixture in vacuo. Extract the aqueous mixture with EtOAc (4×50 mL). Dry the combined organic extracts over MgSO4, filter and concentrate in vacuo to obtain a yellow solid. Purify by chromatography on silica gel eluting with DCM/2M ammonia in methanol (23:2) to obtain the desired intermediate as a white solid (1.28 g, 69%). MS (ES+) m/z: 180.2 (M+H)+.

1. temperatureto warm gradually to room temperature
2. customQuench
3. customthe reaction with 1M aqueous HCl
4. concentrationconcentrate the mixture in vacuo
5. extractionExtract the aqueous mixture with EtOAc (4×50 mL)
6. dry with materialDry the combined organic extracts over MgSO4
7. filtrationfilter
8. concentrationconcentrate in vacuo
9. customto obtain a yellow solid
10. customPurify by chromatography on silica gel eluting with DCM/2M ammonia in methanol (23:2)