反应详情

To a mixture of 9.77 g of 4-nitrophenylethylamine 1/2 sulfate, 6.00 g of (R)-mandelic acid, 4.70 g of potassium carbonate and 60 mL of N,N-dimethylformamide, 6.14 g of hydroxybenztriazole and 8.70 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide monohydrochloride (EDC) were added, and the mixture was stirred at around room temperature for 2 hours. 0.87 g of EDC was further added, and the mixture was stirred at around room temperature overnight. The reaction solution was diluted with water and extracted with ethyl acetate. The organic layer was washed successively with 1M hydrochloric acid aqueous solution, 20% potassium carbonate aqueous solution and water, and then concentrated in vacuo. The residue was recrystallized from toluene to obtain 10.4 g of (R)-2-hydroxy-N-[2-(4-nitrophenyl)ethyl]-2-phenylacetamide as a pale yellow crystal.

1. additionwere added
2. stirringthe mixture was stirred at around room temperature overnight
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed successively with 1M hydrochloric acid aqueous solution, 20% potassium carbonate aqueous solution and water
5. concentrationconcentrated in vacuo
6. customThe residue was recrystallized from toluene