Hydrogen Peroxide → (R)-2-Hydroxymethyl-4-methylpentanoic acid

Temperatur

0 °C

Intermediate (2b) (13.9 g, 40.8 mmol) was dissolved in THF (200 mL, 2 mol) and stirred at 0° C. 9 M hydrogen peroxide in water (46.3 mL) was added, followed by dropwise addition of 1.5 M lithium hydroxide monohydrate in water (54.4 mL). The mixture was then warmed to room temperature and stirred for 2.5 hours. Potassium hydroxide (4.6 g, 81.6 mmol) was added and the mixture was heated at 60° C. for 30 minutes and then cooled at room temperature. To this was added a solution of sodium sulfite (10 g in 200 mL water) followed by water and chloroform (200 mL of each). The aqueous layer was extracted twice more with CHCl3 (150 mL), acidified and extracted with EtOAc. The organic layer was then washed with saturated aqueous NaCl, dried over MgSO4, filtered, and rotovaped to provide intermediate (2c) (5.4 g).

1. temperatureThe mixture was then warmed to room temperature
2. stirringstirred for 2.5 hours
3. temperaturethe mixture was heated at 60° C. for 30 minutes
4. temperaturecooled at room temperature
5. extractionThe aqueous layer was extracted twice more with CHCl3 (150 mL)
6. extractionextracted with EtOAc
7. washThe organic layer was then washed with saturated aqueous NaCl
8. dry with materialdried over MgSO4
9. filtrationfiltered

ORD-Eintrag

ord-32f742c8cd5742a48aa168d12138d615

Quelldatensatz

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08013005B2