反应详情

A solution of (S)—N-benzyl-2-hydroxy-N—((R)-3,3,3-trifluoro-2-hydroxypropyl)propanamide (4-3) in THF (200 ml) was cooled to 0° C. To this was added NaH (60% dispersion in mineral oil, 1.05 g, 26.3 mmol) portionwise as a solid. After 1 hr the cooling bath was removed and the mixture allowed to warm to rt. After an additional hour the mixture was quenched with brine. The mixture was diluted with H2O and extracted with EtOAc (3×). The combined organic layers were dried (MgSO4), filtered, and concentrated to afford (2R,6R)-4-benzyl-2-methyl-6-(trifluoromethyl)morpholin-3-one (4-4) as a clear oil which was sufficiently pure for use in the next step.

1. customAfter 1 hr the cooling bath was removed
2. customAfter an additional hour the mixture was quenched with brine
3. additionThe mixture was diluted with H2O
4. extractionextracted with EtOAc (3×)
5. dry with materialThe combined organic layers were dried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated