Reaktion #9335

Reaktionsgleichung

NH4Cl

L-selectride

10-3

[4-((1R,2S,3R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-{4-[(tert-butyl-dimethyl-silanyloxy)-cyclohexyl-methyl]-phenyl}-5-oxo-cyclopentyl)-but-2-ynyloxy]-acetic acid methyl ester

H2O2

→

alcohol

Ausbeute 61.9%

[4-((1R,2S,3R,5S)-3-(tert-Butyl-dimethyl-silanyloxy)-2-{4-[(tert-butyl-dimethyl-silanyloxy)-cyclohexyl-methyl]-phenyl}-5-hydroxy-cyclopentyl)-but-2-ynyloxy]-acetic acid methyl ester

Ausbeute 61.9%

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe resulting mixture was stirred at room temperature for 45 min.
2. 2
   ExtraktionThe resulting mixture was extracted with ethyl acetate (3×40 mL)
3. 3
   Waschenthe combined ethyl acetate solution was washed with brine
4. 4
   TrocknenThe solution was then dried (Na2SO4)
5. 5
   Filtrationfiltered
6. 6
   Sonstigeevaporated
7. 7
   SonstigePurification by flash chromatography on silica gel (25% ethyl acetate/hexanes)

Vorschrift

L-selectride (0.76 mL, 0.76 mmol, 1 M/THF) was added to a −78° C. THF (20 mL) solution of 10-3 (415 mg, 0.63 mmol). The reaction was stirred for 1 h and then 3% H2O2 (14 mL) was added. The resulting mixture was stirred at room temperature for 45 min. and then saturated NH4Cl solution (60 mL) was added. The resulting mixture was extracted with ethyl acetate (3×40 mL) and the combined ethyl acetate solution was washed with brine. The solution was then dried (Na2SO4), filtered and evaporated. Purification by flash chromatography on silica gel (25% ethyl acetate/hexanes) gave the title alcohol (255 mg, 0.39 mmol, 61%).

Quelle