5-bromo-1,2-difluoro-3-methoxybenzene

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

Procedure: 3.06 g of 1-bromo-3,4-difluoro-5-methoxybenzene (D2), 4.54 ml of pinacolyl allylboronate, 3.04 g of tetrakis(triphenylphosphine)palladium(0) and 7.62 g of caesium fluoride are suspended in 115 ml of tetrahydrofuran under an argon atmosphere. The reaction mixture is subsequently heated under reflux for 48 h. For work-up, the mixture is diluted with 400 ml of diethyl ether and extracted with 100 ml of water and 100 ml of saturated NaCl solution. The combined organic phases are dried over Na2SO4, filtered and evaporated to dryness in vacuo. The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane), giving 1.59 g of the title compound as a colourless oil; MS: 184.0 (M+); TLC: Rf=0.69 (cyclohexane/ethyl acetate 8:1 parts by volume). The reaction mixture is subsequently heated under reflux for 48 h extracted with 100 ml of water and 100 ml of saturated NaCl solution The combined organic phases are dried over Na2SO4 filtered evaporated to dryness in vacuo The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane)

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

Procedure: 3.06 g of 1-bromo-3,4-difluoro-5-methoxybenzene (D2), 4.54 ml of pinacolyl allylboronate, 3.04 g of tetrakis(triphenylphosphine)palladium(0) and 7.62 g of caesium fluoride are suspended in 115 ml of tetrahydrofuran under an argon atmosphere. The reaction mixture is subsequently heated under reflux for 48 h. For work-up, the mixture is diluted with 400 ml of diethyl ether and extracted with 100 ml of water and 100 ml of saturated NaCl solution. The combined organic phases are dried over Na2SO4, filtered and evaporated to dryness in vacuo. The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane), giving 1.59 g of the title compound as a colourless oil; MS: 184.0 (M+); TLC: Rf=0.69 (cyclohexane/ethyl acetate 8:1 parts by volume). The reaction mixture is subsequently heated under reflux for 48 h extracted with 100 ml of water and 100 ml of saturated NaCl solution The combined organic phases are dried over Na2SO4 filtered evaporated to dryness in vacuo The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane)

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

Procedure: Magnesium turnings (0.692 g, 28.47 mmol) were stirred under Ar(g) for 10 min and LiCl 0.5M in THF (28.5 mL, 14.24 mmol) was added followed by DIBAL-H 1M in THF (0.228 mL, 0.23 mmol). The mixture was stirred for 5 min and then 5-bromo-1,2-difluoro-3-methoxybenzene (2.54 g, 11.39 mmol) in 5 mL THF was added in one portion and stirred for 1 h. The mixture was added to N-((3-bromophenyl)(2-cyano-3-fluorophenyl)methylene)-2-methylpropane-2-sulfinamide (4.64 g, 11.39 mmol) in THF (20 mL) and stirred 1 h. MeOH (3 mL) was added and the mixture was treated with HCl in 2.0 MeOH (22.78 mL, 22.78 mmol) for 1 h. NaHCO3(sat) was added and the mixture was extracted with EtOAc. The organic phase was washed with brine, dried over MgSO4 and concentrated. The residue was purified by preparative HPLC to give 714 mg (14%) of the title product as a solid. MS (ES+) m/z 447, 449 [M+H]+. stirred for 1 h stirred 1 h the mixture was extracted with EtOAc The organic phase was washed with brine dried over MgSO4 concentrated The residue was purified by preparative HPLC

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask charged with Pd2dba3 (69 mg, 0.075 mmol), BINAP (112 mg, 0.18 mmol), and NaOt−Bu (650 mg, 6.5 mmol) was degassed and filled with N2. THF (20 mL) was added, followed by a solution 5-bromo-1,2-difluoro-3-methoxybenzene (1.1 g, 5 mmol) and 1-(2,5-dimethoxyphenyl)ethanone (1.08 g, 6 mmol) in THF (10 mL). The resulting mixture was heated at 70° C. for 16 h. Water (30 mL) was added, and the mixture was extracted with ether (3×50 mL). The combined organics were dried over anhydrous Na2SO4, filtered, and concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1) to give 2-(3,4-difluoro-5-methoxyphenyl)-1-(2,5-dimethoxyphenyl)ethanone (0.4 g) as a light yellow solid. 1H NMR (CDCl3): δ 7.24 (d, 1H), 7.04 (dd, 1H), 6.92 (d, 1H), 6.68-6.61 (m, 2H), 4.23 (s, 2H), 3.90 (s, 3H), 3.87 (s, 3H), 3.78 (s, 3H); LCMS: 323 (M+H)+. was degassed filled with N2 THF (20 mL) was added the mixture was extracted with ether (3×50 mL) The combined organics were dried over anhydrous Na2SO4 filtered concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1)

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask charged with Pd2dba3 (69 mg, 0.075 mmol), BINAP (112 mg, 0.18 mmol), and NaOt−Bu (650 mg, 6.5 mmol) was degassed and filled with N2. THF (20 mL) was added, followed by a solution 5-bromo-1,2-difluoro-3-methoxybenzene (1.1 g, 5 mmol) and 1-(2,5-dimethoxyphenyl)ethanone (1.08 g, 6 mmol) in THF (10 mL). The resulting mixture was heated at 70° C. for 16 h. Water (30 mL) was added, and the mixture was extracted with ether (3×50 mL). The combined organics were dried over anhydrous Na2SO4, filtered, and concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1) to give 2-(3,4-difluoro-5-methoxyphenyl)-1-(2,5-dimethoxyphenyl)ethanone (0.4 g) as a light yellow solid. 1H NMR (CDCl3): δ 7.24 (d, 1H), 7.04 (dd, 1H), 6.92 (d, 1H), 6.68-6.61 (m, 2H), 4.23 (s, 2H), 3.90 (s, 3H), 3.87 (s, 3H), 3.78 (s, 3H); LCMS: 323 (M+H)+. was degassed filled with N2 THF (20 mL) was added the mixture was extracted with ether (3×50 mL) The combined organics were dried over anhydrous Na2SO4 filtered concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1)

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

Procedure: To a solution of 5-bromo-2,3-difluorophenol (19 g, 90 mmol) in acetone (180 mL), K2CO3 (18 g, 0.13 mol) and iodomethane (25.8 g, 0.18 mol) were added. The resulting mixture was refluxed for 4 h. Upon completion, the mixture was cooled to room temperature and filtered, and the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1) to give a light yellow liquid 5-bromo-1,2-difluoro-3-methoxybenzene (19 g). 1H NMR (CDCl3): δ 7.00-6.88 (m, 2H), 3.89 (s, 3H). The resulting mixture was refluxed for 4 h filtered the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1)

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

Procedure: To a solution of 5-bromo-2,3-difluorophenol (19 g, 90 mmol) in acetone (180 mL), K2CO3 (18 g, 0.13 mol) and iodomethane (25.8 g, 0.18 mol) were added. The resulting mixture was refluxed for 4 h. Upon completion, the mixture was cooled to room temperature and filtered, and the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1) to give a light yellow liquid 5-bromo-1,2-difluoro-3-methoxybenzene (19 g). 1H NMR (CDCl3): δ 7.00-6.88 (m, 2H), 3.89 (s, 3H). The resulting mixture was refluxed for 4 h filtered the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1˜40/1)

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 100-mL round-bottom flask charged with Pd2dba3 (69 mg, 0.075 mmol), BINAP (112 mg, 0.18 mmol), and NaOt-Bu (650 mg, 6.5 mmol) was degassed and filled with N2. THF (20 mL) was added, followed by a solution 5-bromo-1,2-difluoro-3-methoxybenzene (1.1 g, 5 mmol) and 1-(2,5-dimethoxyphenyl)ethanone (1.08 g, 6 mmol) in THF (10 mL). The resulting mixture was heated at 70° C. for 16 h. Water (30 mL) was added, and the mixture was extracted with ether (3×50 mL). The combined organics were dried over anhydrous Na2SO4, filtered, and concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1-40/1) to give 2-(3,4-difluoro-5-methoxyphenyl)-1-(2,5-dimethoxyphenyl)ethanone (0.4 g) as a light yellow solid. 1H NMR (CDCl3): δ 7.24 (d, 1H), 7.04 (dd, 1H), 6.92 (d, 1H), 6.68-6.61 (m, 2H), 4.23 (s, 2H), 3.90 (s, 3H), 3.87 (s, 3H), 3.78 (s, 3H); LCMS: 323 (M+H)+. was degassed filled with N2 THF (20 mL) was added the mixture was extracted with ether (3×50 mL) The combined organics were dried over anhydrous Na2SO4 filtered concentrated to give the crude product, which was purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1-40/1)

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

Procedure: To a solution of 5-bromo-2,3-difluorophenol (19 g, 90 mmol) in acetone (180 mL), K2CO3 (18 g, 0.13 mol) and iodomethane (25.8 g, 0.18 mol) were added. The resulting mixture was refluxed for 4 h. Upon completion, the mixture was cooled to room temperature and filtered, and the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1-40/1) to give a light yellow liquid 5-bromo-1,2-difluoro-3-methoxybenzene (19 g). 1H NMR (CDCl3): δ 7.00-6.88 (m, 2H), 3.89 (s, 3H). The resulting mixture was refluxed for 4 h filtered the filtrate was evaporated to give the crude product, which was further purified by column chromatography on silica gel (eluting with petroleum ether/ethyl acetate=80/1-40/1)

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

Procedure: 3.06 g of 1-bromo-3,4-difluoro-5-methoxybenzene (D2), 4.54 ml of pinacolyl allylboronate, 3.04 g of tetrakis(triphenylphosphine)palladium(0) and 7.62 g of caesium fluoride are suspended in 115 ml of tetrahydrofuran under an argon atmosphere. The reaction mixture is subsequently heated under reflux for 48 h. For work-up, the mixture is diluted with 400 ml of diethyl ether and extracted with 100 ml of water and 100 ml of saturated NaCl solution. The combined organic phases are dried over Na2SO4, filtered and evaporated to dryness in vacuo. The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane), giving 1.59 g of the title compound as a colourless oil; MS: 184.0 (M+); TLC: Rf=0.69 (cyclohexane/ethyl acetate 8:1 parts by volume). The reaction mixture is subsequently heated under reflux for 48 h extracted with 100 ml of water and 100 ml of saturated NaCl solution The combined organic phases are dried over Na2SO4 filtered evaporated to dryness in vacuo The residue is purified by flash column chromatography on silica gel (solvent: cyclohexane)