反应详情

To a solution of 6-isobutyl-5-methyl-nicotinamide (1.89 g, 9.85 mmol) in DCM (40 mL) and pyridine (2.83 g, 39.4 mmol), TFA anhydride (5.17 g, 24.6 mmol) is added portionwise at 0° C. The mixture is stirred at rt for 24 h, diluted with DCM and washed with water, 4% aq. citric acid solution followed by sat. aq. NaHCO3 solution. The org. extract is dried over MgSO4, filtered and concentrated. The crude product is purified by CC on silica gel eluting with heptane:EA 9:1 to give 6-isobutyl-5-methyl-nicotinonitrile (1.35 g) as a white solid; LC-MS: tR=0.89 min, [M+1]+=175.11.

1. washwashed with water, 4% aq. citric acid solution
2. extractionextract
3. dry with materialis dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude product is purified by CC on silica gel eluting with heptane:EA 9:1