反应详情

108 g of L-glutamine was dissolved in 343 g of water and 102 g of aqueous 27% sodium hydroxide solution, and cooled to 10° C. 138 g of acetone was added, and 152 g of lauroyl chloride and 108 g of aqueous 27% sodium hydroxide solution were dropwise added. 300 g of the acylation liquid was diluted with water, neutralized with 35 g of 75% sulfuric acid, and filtered to obtain a white powder substance, N-lauroyl-L-glutamine. 367 g of isopropyl alcohol and 30 g of 95% sulfuric acid were added to 101.7 g of the product, and refluxed for 3.5 hours. After solvent removal, 350 g of isopropyl alcohol was added to it, and refluxed for 3 hours. After further solvent removal, 350 g of isopropyl alcohol was added and refluxed for 4 hours. The reaction liquid was left cooled to 35° C., and a white solid was collected by filtration, and dried in vacuum at 50° C. to obtain 73.14 g of a crude crystal of N-lauroyl-L-glutamine isopropyl ester (N-lauroyl-L-glutamine isopropyl ester/2-(lauroylamino)glutarimide/isopropyl N-lauroyl-2-pyrrolidone-5-carboxylate/diisopropyl N-lauryl-L-glutamate (ratio by weight)=100/16/9/16). Further, this was recrystallized from acetone to obtain 30.00 g of a pure crystal of N-lauroyl-L-glutamine isopropyl ester.

1. filtrationfiltered