反应详情

605 mg (875 μmol) of benzyl 4-{[tert-butyl(diphenyl)silyl]oxy}-2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]butanoate (racemate) were dissolved in 6 ml of tetrahydrofuran, and 2.2 ml (2.2 mmol, 2.5 eq.) of aqueous sodium hydroxide solution (1.0M) were added. The mixture was stirred at RT for another 1 h and then neutralized with aqueous hydrochloric acid (1N). The phases were separated and the aqueous phase was extracted twice with 25 ml of ethyl acetate. The combined organic phases were dried over magnesium sulphate and filtered, and the solvent was removed under reduced pressure. The crude product was used for the next step without further purification. Yield: 568 mg (93% of theory)

1. customThe phases were separated
2. extractionthe aqueous phase was extracted twice with 25 ml of ethyl acetate
3. dry with materialThe combined organic phases were dried over magnesium sulphate
4. filtrationfiltered
5. customthe solvent was removed under reduced pressure
6. customThe crude product was used for the next step without further purification