反应详情

A solution of 14.8 g (0.641 mmol) of sodium in 750 ml of dry ethanol is stirred at 0° and 44.6 g (0.214 mmol) of 4-aminobenzamidine.2HCl [Shaw and Cooley, J. Am. Chem. Soc., 79, 3561 (1957)] is added. The mixture is stirred 5 min under nitrogen and 46.2 g (0.214 mmol) of diethyl ethoxymethylenemalonate is added. After stirring for 30 min, the mixture is refluxed for 4 hrs and allowed to stand overnight at room temperature. The salt is filtered and washed with isopropanol. The salt is suspended in 214 ml of 2 N potassium hydroxide and stirred at 70° for 4 hr. After treating with a small amount of charcoal, the filtrate is added to 325 ml of 2 N hydrochloric acid with stirring. The acid is filtered, washed with water, ethanol, and ether, and dried to give 50.8 g of the title compound, mp 312°-314° dec. The product is recrystallized from N,-N-dimethylacetamide-water to give 44.5 g mp 313°-314° dec.

1. addition2HCl [Shaw and Cooley, J. Am. Chem. Soc., 79, 3561 (1957)] is added
2. stirringAfter stirring for 30 min
3. temperaturethe mixture is refluxed for 4 hrs
4. waitto stand overnight at room temperature
5. filtrationThe salt is filtered
6. washwashed with isopropanol
7. stirringstirred at 70° for 4 hr
8. additionAfter treating with a small amount of charcoal
9. additionthe filtrate is added to 325 ml of 2 N hydrochloric acid
10. stirringwith stirring
11. filtrationThe acid is filtered
12. washwashed with water, ethanol, and ether
13. customdried