反应详情

Bromine (9.9 ml) was added dropwise to a mixture of 2-acetyl-6-(acetylaminometyl)pyridine (37.0 g) in dioxane (740 ml) and 4N-dioxanic hydrogen chloride (48.1 ml) at ambient temperature with stirring. After the mixture was stirred at 50° C. for 3 hours. To the mixture was added a diisopropyl ether (600 ml) and the mixture was stirred under ice-cooling for 30 minutes. The isolated precipitate was collected by filtration. The precipitate was added to water and the mixture was adjusted to pH 8 with 20% aqueous potassium carbonate. The aqueous mixture was extracted with a mixture of ethyl acetate and tetrahydrofuran. The extract was dried over magnesium sulfate and evaporated in vacuo to give 2-(acetylaminomethyl)-6-bromoacetylpyridine (50.3 g) as an oil. lR (Film): 1710, 1650 cm-1NMR (CDCl3 δ): 2.11 (3H, s), 4.63 (2H, d, J=5.3 Hz), 4.80 (2H, s), 7.43-7.59 (1H, m), 7.78-8.08 (2H, m)

1. stirringAfter the mixture was stirred at 50° C. for 3 hours
2. stirringthe mixture was stirred under ice-
3. temperaturecooling for 30 minutes
4. filtrationThe isolated precipitate was collected by filtration
5. additionThe precipitate was added to water
6. extractionThe aqueous mixture was extracted with a mixture of ethyl acetate and tetrahydrofuran
7. dry with materialThe extract was dried over magnesium sulfate
8. customevaporated in vacuo