Reaktion #488977

Reaktionsgleichung

borontrifluoride

BuLi hexane

1-bromo-4-fluorobenzene

sodium hydroxide

3,6-dioxabicyclo[3.1.0]hexane

→

title compound

Ausbeute 39.7%

(3R*,4S*)-4-(4-Fluorophenyl)tetrahydrofuran-3-ol

Ausbeute 39.7%

Lösungsmittel

hexane

water

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooled to −100° C.
2. 2
   workup.STIRRINGThe mixture was stirred at −100° C. for 15 min
3. 3
   Sonstigewas no higher than −80° C
4. 4
   TemperaturThe reaction mixture was heated to 0° C. for 3 h
5. 5
   Sonstigethe layers were separated
6. 6
   ExtraktionThe aqueous layer was extracted with ether
7. 7
   WaschenThe organic layer was washed with the saturated sodium chloride solution
8. 8
   Trocknendried over sodium sulfate
9. 9
   Sonstigeevaporated

Vorschrift

1.6M BuLi/hexane (399 mL, 0.64 mol, 1.10 eq) was added to a solution of 1-bromo-4-fluorobenzene (70 mL, 0.64 mol, 1.10 eq) in absolute THF (400 mL) in a stream of argon at −90° C. for 1 h. The mixture was stirred at −90° C. for 30 min, cooled to −100° C., and 3,6-dioxabicyclo[3.1.0]hexane (50 g, 0.58 mol, 1 eq) was added. The mixture was stirred at −100° C. for 15 min, and borontrifluoride diethyletherate (81 mL, 0.64 mol, 1.10 eq) was added at the same temperature for 1 h so that the temperature was no higher than −80° C. The reaction mixture was heated to 0° C. for 3 h and diluted with hexane (300 mL) and water (300 mL). 10N sodium hydroxide (50 mL) was added, and the layers were separated. The aqueous layer was extracted with ether. The organic layer was washed with the saturated sodium chloride solution, dried over sodium sulfate, and evaporated. The mixture was subjected to chromatography on silica (1 L, carbon tetrachloride→25, 50, 75, 100% chloroform) to give title compound as a yellow oil (42 g, 0.23 mol, 39.7%).

Quelle