反应详情

Ethanol (2,200 ml) and 5,156 g (8.81 moles) of ethyl 2-(2-nitrophenyl)acetimidate hydrochloride were charged into a 22 liter flask. The suspension was stirred under nitrogen at room temperature and 1022.9 g (9.73 moles) of aminoacetaldehyde dimethylacetal were added all at once. The mixture was stirred for 1 hour and 1,693 ml of 12N hydrochloric acid were added all at once to cause a gentle exotherm (to 40°). Heat was then applied and the temperature was maintained at 70°-80° for 30 minutes. The solution was cooled to 20° (ice-water bath) and diluted with 2,700 ml fo 10N sodium hydroxide solution to precipitate the product. The suspension was stirred at 10° for 1 hour under nitrogen atmosphere, the solid collected by filtration and washed with 3×2,000 ml of water to give 2-(2-nitrobenzyl)-imidazole, m.p. 155°-7°.

1. stirringThe mixture was stirred for 1 hour
2. customa gentle exotherm (to 40°)
3. temperatureHeat
4. temperaturethe temperature was maintained at 70°-80° for 30 minutes
5. additiondiluted with 2,700 ml
6. customto precipitate the product
7. stirringThe suspension was stirred at 10° for 1 hour under nitrogen atmosphere
8. filtrationthe solid collected by filtration
9. washwashed with 3×2,000 ml of water