反应详情

温度

0 °C

Ammonium chloride (1.60 g, 29.9 mmol) was slurried in toluene (30 mL) and cooled to 0° C. A 2.0 M solution of trimethylaluminum in toluene (15 mL, 30 mmol) was added dropwise and the cooling bath was removed. After stirring 1.5 h, a solution of benzyl cyanide (1.15 mL, 9.96 mmol) in toluene (20 mL) was added dropwise. The reaction mixture was heated to 80° C. for 16 h, then allowed to cool and poured carefully into a slurry of Merck silica gel 60, 40-63 μm (22 g) in chloroform (75 mL). After stirring 5 min, this slurry was filtered and the cake was washed with methanol (2×75 mL). The combined filtrates were concentrated in vacuo to precipitate ammonium chloride, which was removed by filtration. To the resulting filtrate, was added a 4.0 M solution of hydrochloric acid in dioxane (7 mL, 28 mmol). The resulting mixture was added to diethyl ether (220 mL) and isopropyl alcohol and this mixture was then concentrated in vacuo. The residue was stirred in diethyl ether (100 mL) for 10 min and then allowed to stand. The supernatant was poured off and the residue was dried in vacuo to afford 2-phenyl-acetamidine hydrochloride (1.6 g) as a faintly yellow paste contaminated with ammonium chloride and isopropyl alcohol. This was used without further purification.

1. customthe cooling bath was removed
2. temperatureThe reaction mixture was heated to 80° C. for 16 h
3. temperatureto cool
4. stirringAfter stirring 5 min
5. filtrationthis slurry was filtered
6. washthe cake was washed with methanol (2×75 mL)
7. concentrationThe combined filtrates were concentrated in vacuo
8. customto precipitate ammonium chloride, which
9. customwas removed by filtration
10. concentrationthis mixture was then concentrated in vacuo
11. stirringThe residue was stirred in diethyl ether (100 mL) for 10 min
12. additionThe supernatant was poured off
13. customthe residue was dried in vacuo