Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a mixture of 100 g (746 mmol) of indan-1-ol, 250 ml (1.64 mol) of N,N,N′,N′-tetramethylethylenediamine, and 3000 ml of pentane cooled to −20° C. 655 ml (1.64 mol) of 2.5M nBuLi in hexanes was added. After that the reaction mixture was refluxed for 12 h and then cooled to −80° C. Further on, 225 ml (1.87 mol) of 1,2-dibromotetrafluoroethane was added, and the resulting mixture was allowed to warm to room temperature. This mixture was stirred for 12 h, and then 100 ml of water was added. The resulting mixture was diluted with 2000 ml of water, and the organic layer was separated. The aqueous layer was extracted with 3×400 ml of toluene. The combined organic extract was dried over Na2SO4 and evaporated to dryness. The residue was distilled using a Kugelrohr apparatus, b.p. 120-140° C./1 mbar. The resulting yellow oil was dissolved in 50 ml of triethylamine, and the obtained solution added dropwise to a stirred solution of 49.0 ml (519 mmol) of acetic anhydride and 4.21 g (34.5 mmol) of 4-(dimethylamino)pyridine in 70 ml of triethylamine. The resulting mixture was stirred for 5 min, then 1000 ml of water was added, and stirring was continued for 12 h. After that the reaction mixture was extracted with 3×200 ml of ethyl acetate. The combined organic extract was washed with aqueous Na2CO3, dried over Na2SO4, and evaporated to dryness. The residue was purified by flash chromatography on silica gel 60 (40-63 um, eluent: hexane-ethyl acetate=30:1, vol.). The resulting ester was dissolved in 1000 ml of methanol, 50.5 g (900 mmol) of KOH was added, and this mixture was refluxed for 3 h. The reaction mixture was then cooled to room temperature and poured into 4000 ml of water. Crude product was extracted with 3×300 ml of dichloromethane. The combined organic extract was dried over Na2SO4 and evaporated to dryness. Yield 41.3 g (26%) of a white crystalline solid. Anal. Calc for C9H9BrO: C, 50.73; H, 4.26. Found: C, 50.85; H, 4.48. 1H NMR (CDCl3): δ 7.34 (d, J=7.6 Hz, 1H, 6-H); 7.19 (d, J=7.4 Hz, 1H, 4-H); 7.12 (dd, J=7.6 Hz, J=7.4 Hz, 1H, 5-H); 5.33 (dd, J=2.6 Hz, J=6.9 Hz, 1H, 1-H), 3.18-3.26 (m, 1H, 3- or 3′-H), 3.09 (m, 2H, 3,3′-H); 2.73 (m, 2H, 2,2′-H).
After that the reaction mixture was refluxed for 12 h
cooled to −80° C
to warm to room temperature
the organic layer was separated
The aqueous layer was extracted with 3×400 ml of toluene
The combined organic extract
was dried over Na2SO4
evaporated to dryness
The residue was distilled
The resulting yellow oil was dissolved in 50 ml of triethylamine
The resulting mixture was stirred for 5 min
stirring
was continued for 12 h
After that the reaction mixture was extracted with 3×200 ml of ethyl acetate
The combined organic extract
was washed with aqueous Na2CO3
dried over Na2SO4
evaporated to dryness
The residue was purified by flash chromatography on silica gel 60 (40-63 um, eluent: hexane-ethyl acetate=30:1, vol.)
The resulting ester was dissolved in 1000 ml of methanol
this mixture was refluxed for 3 h
The reaction mixture was then cooled to room temperature
Crude product was extracted with 3×300 ml of dichloromethane
The combined organic extract
was dried over Na2SO4
evaporated to dryness
Source ID: ord-9b123ebc783f40ed8719d3a3c979ef77