反应详情

A mixture of 4-chloro-1H-imidazo-[4,5-c]-pyridine (2.0 g, 13 mmole), benzylamine (5 ml) and a few drops of water was heated at reflux for 4 days. The reaction mixture was poured onto ice and water and the cold mixture was extracted twice with diethylether. The ether was removed in vacuo and the residual oil was triturated twice with hexane. The oil was suspended in water and the aqueous phase was neutralised with glacial acetic acid. The aqueous phase was taken to dryness in vacuo and resuspended in water (15 ml). It was applied to a column of Dowex 50 (H+) (10 g). The column was washed with water until the ultra violet absorbance of the eluant had fallen to zero. The column packing was removed from the column and heated with several portions of concentrated ammonium hydroxide solution (400 ml). The basic solution was filtered in vacuo, cooled and neutralized with glacial acetic acid. The yellow solid was collected and dried in vacuo at 40° C. Yield of 4-benzylamino-1 H-imidazo-[4,5-c]-pyridine 0.94 g, m.p. 60°-64° C., 31.5%.

1. temperaturewas heated
2. temperatureat reflux for 4 days
3. extractionthe cold mixture was extracted twice with diethylether
4. customThe ether was removed in vacuo
5. customthe residual oil was triturated twice with hexane
6. washThe column was washed with water until the ultra violet absorbance of the eluant
7. customThe column packing was removed from the column
8. temperatureheated with several portions of concentrated ammonium hydroxide solution (400 ml)
9. filtrationThe basic solution was filtered in vacuo
10. temperaturecooled
11. customThe yellow solid was collected
12. customdried in vacuo at 40° C