反应详情

温度

50 °C

164 g (1.04 mol) of ethyl piperazinecarboxylate, 156.9 g (1.14 mol) of (2-chloroethoxy)acetamide, 241.7 g (2.28 mol) of sodium carbonate, 1 g of potassium iodide and 200 ml of toluene are introduced into a 2 1 three-necked round-bottomed flask fitted with a water-cooled condenser and a mechanical stirrer. The mixture is brought at the reflux temperature for 3 hours 30. The mixture is allowed to cool to 50° C., and 200 ml of isopropanol are added. The reaction mixture is filtered and the filtration residue is washed with 150 ml of isopropanol. The filtrate is concentrated on a rotary evaporator under reduced pressure. 272.2 g of crude product are obtained, which product is recrystallized from 500 ml of ethyl acetate. 219.2 g (81.6%) of ethyl (2-carbamoylmethoxyethyl)piperazine-1-carboxylate are obtained in the form of a white solid.

1. temperaturecooled condenser and a mechanical stirrer
2. filtrationThe reaction mixture is filtered
3. washthe filtration residue is washed with 150 ml of isopropanol
4. concentrationThe filtrate is concentrated on a rotary evaporator under reduced pressure
5. custom272.2 g of crude product are obtained
6. customwhich product is recrystallized from 500 ml of ethyl acetate