反应详情

To a mixture of dimethyl malonate (100 g) and 3-nitrobenzonitrile (112 g) in 1,2-dichloroethane (500 ml) was added stannic chloride (177 g) at once with a syringe and refluxed for 1 hour with stirring. The white precipitates were collected by filtration, dissolved in a mixture of acetone (2 l) and water (2 l) and adjusted to pH 9.0 with 20% aqueous sodium hydroxide. The resulting white solid was filtered off, and the filtrate was extracted with methylene chloride (2 l). The extract was washed with saturated aqueous sodium chloride, dried over magnesium sulfate and evaporated in vacuo. The resulting precipitates were recrystallized from a mixture of diethyl ether and methylene chloride to give dimethyl (α-amino-3-nitrobenzylidene)malonate (139.5 g).

1. temperaturerefluxed for 1 hour
2. customThe white precipitates
3. filtrationwere collected by filtration
4. dissolutiondissolved in a mixture of acetone (2 l) and water (2 l)
5. filtrationThe resulting white solid was filtered off
6. extractionthe filtrate was extracted with methylene chloride (2 l)
7. washThe extract was washed with saturated aqueous sodium chloride
8. dry with materialdried over magnesium sulfate
9. customevaporated in vacuo
10. customThe resulting precipitates
11. customwere recrystallized from a mixture of diethyl ether and methylene chloride