4-bromo-2,3-difluorophenol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the crude 4-bromo-2,3-difluorophenol (0.40 g) [prepared using published procedure, WO0121606] and (2R)-glycidyl 3-nitrobenzenesulfonate (0.49 g) in dry acetone (19 mL) was treated with potassium carbonate (0.79 g) and refluxed under nitrogen for 12 h. The reaction was cooled, filtered and filtrate was concentrated in vacuo and the residue was flash chromatographed (20% ethyl acetate/hexanes) to yield the desired product (0.33 g) in 71% yield. 1H-NMR (400 MHz, CDCl3) δ: 7.23-7.19 (m, 1H), 6.74-6.71 (m, 1H), 4.35-4.32 (m, 1H), 4.03-3.99 (m, 1H), 3.38-3.35 (m, 1H), 2.93-2.92 (m, 1H), 2.77-2.76 (m, 1H). refluxed under nitrogen for 12 h The reaction was cooled filtered filtrate was concentrated in vacuo chromatographed (20% ethyl acetate/hexanes)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 4-bromo-2,3-difluorophenol (5 g, 23.92 mmol) in acetonitrile (50 mL) was added potassium carbonate (3.31 g, 23.92 mmol) at room temperature and the reaction mixture was stirred for 5 min followed by the addition of 1-(chloromethyl)-4-methoxybenzene (3.75 g, 23.92 mmol) dropwise then the reaction mixture was stirred at room temperature for 16 h. After the completion of reaction, the volatiles were removed under reduced pressure. Water (100 mL) was added and the solution extracted with ethyl acetate (2×120 mL). The combined organic layers were washed with brine (100 mL), dried over sodium sulphate, filtered and concentrated under reduced pressure to afford 1-bromo-2,3-difluoro-4-((4-methoxybenzyl)oxy)benzene (7.58 g, 23.03 mmol, 96% yield) as a pale brown solid. The product was carried on without further purification. LCMS (ESI) m/e 329.1 [(M)−, calcd for C14H10BrF2O2 329.0]; LC/MS retention time (Method G): tR=1.20 min. the reaction mixture was stirred at room temperature for 16 h After the completion of reaction the volatiles were removed under reduced pressure Water (100 mL) was added the solution extracted with ethyl acetate (2×120 mL) The combined organic layers were washed with brine (100 mL) dried over sodium sulphate filtered concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the crude 4-bromo-2,3-difluorophenol (0.40 g) [prepared using published procedure, WO0121606] and (2R)-glycidyl 3-nitrobenzenesulfonate (0.49 g) in dry acetone (19 mL) was treated with potassium carbonate (0.79 g) and refluxed under nitrogen for 12 h. The reaction was cooled, filtered and filtrate was concentrated in vacuo and the residue was flash chomatogaphed (20% ethyl acetate/hexanes) to yield the desired product (0.33 g) in 71% yield. 1H-NMR (400 MHz, CDCl3) δ: 7.23-7.19 (m, 1H), 6.74-6.71 (m, 1H), 4.35-4.32 (m, 1H), 4.03-3.99 (m, 1H), 3.38-3.35 (m, 1H), 2.93-2.92 (m, 1H), 2.77-2.76 (m, 1H). refluxed under nitrogen for 12 h The reaction was cooled filtered filtrate was concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the crude 4-bromo-2,3-difluorophenol (0.40 g) [prepared using published procedure, WO0121606] and (2R)-glycidyl 3-nitrobenzenesulfonate (0.49 g) in dry acetone (19 mL) was treated with potassium carbonate (0.79 g) and refluxed under nitrogen for 12 h. The reaction was cooled, filtered and filtrate was concentrated in vacuo and the residue was flash chomatogaphed (20% ethyl acetate/hexanes) to yield the desired product (0.33 g) in 71% yield. 1H-NMR (400 MHz, CDCl3) δ: 7.23-7.19 (m, 1H), 6.74-6.71 (m, 1H), 4.35-4.32 (m, 1H), 4.03-3.99 (m, 1H), 3.38-3.35 (m, 1H), 2.93-2.92 (m, 1H), 2.77-2.76 (m, 1H). refluxed under nitrogen for 12 h The reaction was cooled filtered filtrate was concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To an aqueous (400 ml) solution of 4-bromo-2,3-difluorophenol (T-1) (195.0 g), bromoethane (196.2 g) and tetrabutylammonium bromide (hereinafter, abbreviated as TBAB) (24.2 g), sodium hydroxide (75.9 g) was added, and heating agitation was carried out at 80° C. for 6 hours in a nitrogen atmosphere. After completion of the reaction, extraction was carried out with heptane, an organic layer was washed with water and a saturated aqueous solution of sodium chloride, and then the resultant solution was dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and thus a black oily matter was obtained. The resultant material was purified by distillation, and thus 1-ethoxy-2,3-difluorobromobenzene (T-2) was obtained as a colorless oily matter (230.0 g, yield: 97%). was added heating agitation After completion of the reaction, extraction an organic layer was washed with water a saturated aqueous solution of sodium chloride, and then the resultant solution was dried over anhydrous magnesium sulfate concentrated under reduced pressure thus a black oily matter was obtained The resultant material was purified by distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To an aqueous (400 ml) solution of 4-bromo-2,3-difluorophenol (T-1) (195.0 g), bromoethane (196.2 g) and tetrabutylammonium bromide (hereinafter, abbreviated as TBAB) (24.2 g), sodium hydroxide (75.9 g) was added, and heating agitation was carried out at 80° C. for 6 hours in a nitrogen atmosphere. After completion of the reaction, extraction was carried out with heptane, an organic layer was washed with water and a saturated aqueous solution of sodium chloride, and then the resultant solution was dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and thus a black oily matter was obtained. The resultant material was purified by distillation, and thus 1-ethoxy-2,3-difluorobromobenzene (T-2) was obtained as a colorless oily matter (230.0 g, yield: 97%). was added heating agitation After completion of the reaction, extraction an organic layer was washed with water a saturated aqueous solution of sodium chloride, and then the resultant solution was dried over anhydrous magnesium sulfate concentrated under reduced pressure thus a black oily matter was obtained The resultant material was purified by distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-bromo-2,3-difluorophenol (1.0 g, 0.0048 mol), phenylboronic acid (1.4 g, 0.012 mol), TEA (4.0 mL, 0.029 mol), cupric acetate (1.4 g, 0.0076 mol) and DCM (60 mL, 1 mol) were added to a 100 mL oven dried flask and the reaction was stirred at rt for 48 h. Reaction mixture was then filtered through celite. The filtrate was concentrated in vacuo to give a residue which was purified by silica gel chromatography, eluting with 5% EtOAc in hexane. 1H NMR (400 MHz, CDCl3): δ=6.70 (ddd, J=9.22, 7.33, 2.15 Hz, 1H), 6.95-7.02 (m, 2H), 7.15 (t, J=7.45 Hz, 1H), 7.23 (ddd, J=9.16, 6.88, 2.40 Hz, 1H), 7.31-7.38 (m, 2H). dried flask Reaction mixture was then filtered through celite The filtrate was concentrated in vacuo to give a residue which was purified by silica gel chromatography eluting with 5% EtOAc in hexane

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 4-bromo-2,3-difluorophenol (5 g, 23.92 mmol) in acetonitrile (50 mL) was added potassium carbonate (3.31 g, 23.92 mmol) at room temperature and the reaction mixture was stirred for 5 min followed by the addition of 1-(chloromethyl)-4-methoxybenzene (3.75 g, 23.92 mmol) dropwise then the reaction mixture was stirred at room temperature for 16 h. After the completion of reaction, the volatiles were removed under reduced pressure. Water (100 mL) was added and the solution extracted with ethyl acetate (2×120 mL). The combined organic layers were washed with brine (100 mL), dried over sodium sulphate, filtered and concentrated under reduced pressure to afford 1-bromo-2,3-difluoro-4-((4-methoxybenzyl)oxy)benzene (7.58 g, 23.03 mmol, 96% yield) as a pale brown solid. The product was carried on without further purification. LCMS (ESI) m/e 329.1 [(M)−, calcd for C14H10BrF2O2 329.0]; LC/MS retention time (Method G): tR=1.20 min. the reaction mixture was stirred at room temperature for 16 h After the completion of reaction the volatiles were removed under reduced pressure Water (100 mL) was added the solution extracted with ethyl acetate (2×120 mL) The combined organic layers were washed with brine (100 mL) dried over sodium sulphate filtered concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 4-bromo-2,3-difluorophenol (5 g, 23.92 mmol) in acetonitrile (50 mL) was added potassium carbonate (3.31 g, 23.92 mmol) at room temperature and the reaction mixture was stirred for 5 min followed by the addition of 1-(chloromethyl)-4-methoxybenzene (3.75 g, 23.92 mmol) dropwise then the reaction mixture was stirred at room temperature for 16 h. After the completion of reaction, the volatiles were removed under reduced pressure. Water (100 mL) was added and the solution extracted with ethyl acetate (2×120 mL). The combined organic layers were washed with brine (100 mL), dried over sodium sulphate, filtered and concentrated under reduced pressure to afford 1-bromo-2,3-difluoro-4-((4-methoxybenzyl)oxy)benzene (7.58 g, 23.03 mmol, 96% yield) as a pale brown solid. The product was carried on without further purification. LCMS (ESI) m/e 329.1 [(M)−, calcd for C14H10BrF2O2 329.0]; LC/MS retention time (Method G): tR=1.20 min. the reaction mixture was stirred at room temperature for 16 h After the completion of reaction the volatiles were removed under reduced pressure Water (100 mL) was added the solution extracted with ethyl acetate (2×120 mL) The combined organic layers were washed with brine (100 mL) dried over sodium sulphate filtered concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a reactor under nitrogen atmosphere, 20.0 g of compound (a2)17.2 g of 4-bromo-2,3-difluorophenol (a3), 30.6 g of sodium carbonate, 0.54 g of palladium on carbon catalyst (Pd/C) were dissolved in 120 mL of 2-propanol (IPA). After stirring by refluxing for 10 hours, the reaction mixture was cooled to room temperature, and injected into a mixture of 500 ml of 1N hydrochloric acid and 300 ml of toluene which was cooled into 0° C. The mixture was separated into organic layer and aqueous layer and the organic layer was extracted. The resulting organic layer was washed with saturated chloride aqueous solution and dried over anhydrous magnesium sulfate, and the solvent was concentrated under reduced pressure to provide the residue. The resulting residue was purified by recrystallization from heptan, dried to provide 13.2 g of 4′-ethoxy-2,3,2′,3′-tetrafluorobiphenyl-4-ol (a4) as a white solid. by refluxing for 10 hours was cooled into 0° C The mixture was separated into organic layer and aqueous layer the organic layer was extracted The resulting organic layer was washed with saturated chloride aqueous solution dried over anhydrous magnesium sulfate the solvent was concentrated under reduced pressure to provide the residue The resulting residue was purified by recrystallization from heptan dried