反应详情

温度

85 °C

In 200 ml of N,N-dimethylformamide was dissolved 100 g of (4R)-4-[(1R)-1-(N-benzylamino)-1-carbamoylmethyl]-3-benzylthiazolidin-2-one, and under nitrogen atmosphere, the solution was stirred at 85° C. for 5 hours. At 90° C. to 95° C., 200 ml of 35% hydrochloric acid was added dropwise to the solution, and the mixture was stirred for 1 hour and 15 minutes. Moreover, 100 ml of 35% hydrochloric acid was added dropwise, and the mixture was stirred for 2 hours. Then, 200 ml of water was added dropwise to the mixture at 85° C. The solution was ice-cooled, and precipitated crystal was collected by filtration, washed with water and then dried at 50° C. for 17 hours to give 93.1 g of (4R,5R)-1,3-dibenzyl-2-oxo-5-(mercaptomethyl)-imidazolidin-4-carboxylic acid as colorless crystal.

1. stirringthe mixture was stirred for 1 hour and 15 minutes
2. stirringthe mixture was stirred for 2 hours
3. temperaturecooled
4. customprecipitated crystal
5. filtrationwas collected by filtration
6. washwashed with water
7. customdried at 50° C. for 17 hours