反应详情

To (S)-tert-butyl (1-cyclohexyl-4-methyl-3-oxopent-4-en-2-yl)carbamate (5.36 g, 18.1 mmol) in DMF at −10° C. was added NaOCl (47.1 mL of a 9.5% w/w solution, 36.2 mmol). Addition of NaOCl was performed at a rate to maintain an internal temperature of ≦−10° C. After the addition was complete the reaction mixture was transferred to an ice bath and stirred for an additional 2 h at which time it was diluted with water and EtOAc, extracted with EtOAc (2×), washed with brine, dried with sodium sulfate, filtered, and concentrated. Purification by column chromatography (3:1 heptane/EtOAc) provided tert-butyl ((S)-3-cyclohexyl-1-((R)-2-methyloxiran-2-yl)-1-oxopropan-2-yl)carbamate (3.68 g, 65%) as a colorless amorphous solid. MS (EI) for C17H29NO4, found 310.2 (MH−).

1. temperatureto maintain an internal temperature of ≦−10° C
2. additionAfter the addition
3. customwas transferred to an ice bath
4. extractionextracted with EtOAc (2×)
5. washwashed with brine
6. dry with materialdried with sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customPurification by column chromatography (3:1 heptane/EtOAc)