Reacción #666568

Ecuación de reacción

3-hydroxy-3-methylbutyl toluene-4-sulfonate

potassium carbonate

(9R)-4-chloro-9-(trifluoromethyl)-9H-fluorene-2,9-diol

3-hydroxy-3-methylbutyl toluene-4-sulfonate

water

→

title compound

Rendimiento 69.3%

(9R)-4-Chloro-2-(3-hydroxy-3-methylbutyloxy)-9-(trifluoromethyl)-9H-fluoren-9-ol

Rendimiento 69.3%

Disolventes

N,N-dimethylformamide

N,N-dimethylformamide

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.STIRRINGthe mixture was further stirred at the same temperature for 9.5 hr
2. 2
   Temperaturacooled
3. 3
   Extracciónthe mixture was extracted with ethyl acetate (900 ml)
4. 4
   LavadoThe obtained organic layer was washed with water (500 ml, 3 times) and saturated brine (500 ml)
5. 5
   SecadoThe obtained organic layer was dried over anhydrous sodium sulfate
6. 6
   Filtraciónthe insoluble material was filtered off
7. 7
   Otrothe solvent in the filtrate was evaporated
8. 8
   OtroThe obtained residue was purified by silica gel column chromatography (
9. 9
   workup.ADDITIONa mixture of hexane and ethyl acetate
10. 10
    Lavadofirst eluted with a mixture of (hexane:ethyl acetate) at a mixing ratio 3:1

Procedimiento

Under a nitrogen atmosphere, (9R)-4-chloro-9-(trifluoromethyl)-9H-fluorene-2,9-diol (55.5 g) was dissolved in N,N-dimethylformamide (550 ml), 3-hydroxy-3-methylbutyl toluene-4-sulfonate (49.6 g) and potassium carbonate (39.5 g) were added, and the mixture was stirred at an oil bath temperature of 70° C. overnight. To the reaction mixture was added a solution of 3-hydroxy-3-methylbutyl toluene-4-sulfonate (4.0 g) in N,N-dimethylformamide (5 ml), and the mixture was further stirred at the same temperature for 9.5 hr. The reaction mixture was ice-cooled, water (800 ml) was added, and the mixture was extracted with ethyl acetate (900 ml). The obtained organic layer was washed with water (500 ml, 3 times) and saturated brine (500 ml). The obtained organic layer was dried over anhydrous sodium sulfate, the insoluble material was filtered off, and the solvent in the filtrate was evaporated. The obtained residue was purified by silica gel column chromatography (a mixture of hexane and ethyl acetate was used as an elution solvent, first eluted with a mixture of (hexane:ethyl acetate) at a mixing ratio 3:1, and then with the mixture at a mixing ratio 2:1, and further with the mixture at a mixing ratio 3:2) to give the title compound (49.5 g).

Fuente