反应详情

温度

100 °C

Five grams of dihydro-1H-pyrrolizine-3,5(2H,6H)-dione (III) are dissolved in 31 g of o-chlorobenzyl alcohol and 0.2 ml of concentrated hydrochloric acid is added. The solution is heated at 100° C. for 71 hours. The mixture is cooled and dissolved in 150 ml of anhydrous diethylether. The solution is cooled to induce crystallization and the resulting crystals are isolated by filtration. Recrystallization from toluene-diethyl ether yields 5-oxo-2-pyrrolidinepropanoic acid o-chlorobenzyl ester with a melting point of 99°-100° C.

1. temperatureThe mixture is cooled
2. temperatureThe solution is cooled
3. customcrystallization
4. customthe resulting crystals are isolated by filtration
5. customRecrystallization from toluene-diethyl ether