反应详情

2.15 g (6.45 mmol) of ethyl (3R)—N-[(benzyloxy)carbonyl]-4,4,4-trifluorovalinate (diastereomer mixture) were dissolved in a mixture of in each case 8 ml of THF, methanol and water, and 3.87 g (96.8 mmol) of sodium hydroxide were added at 0° C. Ice-cooling was removed and the reaction mixture was stirred at RT for 1 h. The mixture was then added to water, acidified with semiconcentrated hydrochloric acid and extracted with ethyl acetate. The organic phase was washed with sat. sodium chloride solution, dried over sodium sulphate and concentrated under reduced pressure. This gave 1.95 g of the target product which was not purified any further (99% of theory, diastereomer ratio about 2.8:1).

1. additionwere added at 0° C
2. temperatureIce-cooling
3. customwas removed
4. additionThe mixture was then added to water
5. extractionextracted with ethyl acetate
6. washThe organic phase was washed with sat. sodium chloride solution
7. dry with materialdried over sodium sulphate
8. concentrationconcentrated under reduced pressure
9. customThis gave 1.95 g of the target product which was not purified any further (99% of theory, diastereomer ratio about 2.8:1)