5-bromo-2-methylphenol

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

Procedure: To a solution of 5-bromo-2-methylphenol (Intermediate 1, 3.6 g, 19.3 mmol) in THF (150 mL) at −78° C. was added n-butyl lithium (30 mL, 1.6 M solution in hexanes, 48.1 mmol) and the reaction stirred at this temperature for 30 minutes. Trimethylsilyl chloride (6.1 mL, 48.1 mmol) was then added and the solution stirred at −78° C. for 1.5 hours. The reaction was allowed to warm to room temperature and water (75 mL) was added. The mixture was extracted with diethyl ether (2×75 mL) and the combined organic extracts were dried (magnesium sulphate) and concentrated under reduced pressure to afford 2-methyl-5-(trimethylsilyl)phenoxytrimethylsilane (5 g) as a yellow oil. 1H NMR δH 0.26 (9 H, s), 0.29 (9 H, s), 2.20 (3 H, s), 6.93 (1 H, d, J=1.1 Hz), 7.04 (1 H, dd, J=7.3, 1.1 Hz), 7.16 (1 H, d, J=7.4 Hz). the solution stirred at −78° C. for 1.5 hours The mixture was extracted with diethyl ether (2×75 mL) the combined organic extracts were dried (magnesium sulphate) concentrated under reduced pressure

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

Procedure: To a solution of 5-bromo-2-methylphenol (Intermediate 1, 3.6 g, 19.3 mmol) in THF (150 mL) at −78° C. was added n-butyl lithium (30 mL, 1.6 M solution in hexanes, 48.1 mmol) and the reaction stirred at this temperature for 30 minutes. Trimethylsilyl chloride (6.1 mL, 48.1 mmol) was then added and the solution stirred at −78° C. for 1.5 hours. The reaction was allowed to warm to room temperature and water (75 mL) was added. The mixture was extracted with diethyl ether (2×75 mL) and the combined organic extracts were dried (magnesium sulphate) and concentrated under reduced pressure to afford 2-methyl-5-(trimethylsilyl)phenoxytrimethylsilane (5 g) as a yellow oil. 1H NMR δH 0.26 (9 H, s), 0.29 (9 H, s), 2.20 (3 H, s), 6.93 (1 H, d, J=1.1 Hz), 7.04 (1 H, dd, J=7.3, 1.1 Hz), 7.16 (1 H, d, J=7.4 Hz). the solution stirred at −78° C. for 1.5 hours The mixture was extracted with diethyl ether (2×75 mL) the combined organic extracts were dried (magnesium sulphate) concentrated under reduced pressure

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

Procedure: To a solution of 5-bromo-2-methylphenol (Intermediate 1, 3.6 g, 19.3 mmol) in THF (150 mL) at −78° C. was added n-butyl lithium (30 mL, 1.6 M solution in hexanes, 48.1 mmol) and the reaction stirred at this temperature for 30 minutes. Trimethylsilyl chloride (6.1 mL, 48.1 mmol) was then added and the solution stirred at −78° C. for 1.5 hours. The reaction was allowed to warm to room temperature and water (75 mL) was added. The mixture was extracted with diethyl ether (2×75 mL) and the combined organic extracts were dried (magnesium sulphate) and concentrated under reduced pressure to afford 2-methyl-5-(trimethylsilyl)phenoxytrimethylsilane (5 g) as a yellow oil. 1H NMR δH 0.26 (9 H, s), 0.29 (9 H, s), 2.20 (3 H, s), 6.93 (1 H, d, J=1.1 Hz), 7.04 (1 H, dd, J=7.3, 1.1 Hz), 7.16 (1 H, d, J=7.4 Hz). the solution stirred at −78° C. for 1.5 hours The mixture was extracted with diethyl ether (2×75 mL) the combined organic extracts were dried (magnesium sulphate) concentrated under reduced pressure

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

Procedure: To a solution of 5-amino-2-methylphenol (10 g, 81.2 mmol) in hydrobromic acid (40 mL, 48% solution) and water (50 mL) at 0° C. was added a solution of sodium nitrite (5.6 g, 81.2 mmol) in water (15 mL) and the mixture stirred at this temperature for 30 minutes. To this was added copper (I) bromide (11.6 g, 81.2 mmol) in hydrobromic acid (15 mL, 48% solution) and the reaction was subsequently heated at reflux for 2 hours. Upon cooling to room temperature the resulting mixture was extracted with ethyl acetate (2×200 mL) and the combined organic extracts were washed with aqueous potassium hydroxide solution (˜1 M, 200 mL), dried (magnesium sulphate) and concentrated under reduced pressure. The crude product was purified by column chromatography [SiO2; light petroleum to 4:1 light petroleum-ethyl acetate] to give the title compound as a colourless oil, which crystallised to give fine colourless needles upon standing overnight (4 g, 26%). Rf=0.26 [4:1 light petroleum-ethyl acetate]. 1H NMR δ 2.21 (3 H, s), 4.89-4.95 (1 H, br, s), 6.96-6.97 (1 H, br, m), 6.99-7.00 (2 H, m). the reaction was subsequently heated at reflux for 2 hours was extracted with ethyl acetate (2×200 mL) the combined organic extracts were washed with aqueous potassium hydroxide solution (˜1 M, 200 mL) dried (magnesium sulphate) concentrated under reduced pressure The crude product was purified by column chromatography [SiO2; light petroleum to 4:1 light petroleum-ethyl acetate]

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

Procedure: To a solution of 5-amino-2-methylphenol (10 g, 81.2 mmol) in hydrobromic acid (40 mL, 48% solution) and water (50 mL) at 0° C. was added a solution of sodium nitrite (5.6 g, 81.2 mmol) in water (15 mL) and the mixture stirred at this temperature for 30 minutes. To this was added copper (I) bromide (11.6 g, 81.2 mmol) in hydrobromic acid (15 mL, 48% solution) and the reaction was subsequently heated at reflux for 2 hours. Upon cooling to room temperature the resulting mixture was extracted with ethyl acetate (2×200 mL) and the combined organic extracts were washed with aqueous potassium hydroxide solution (˜1 M, 200 mL), dried (magnesium sulphate) and concentrated under reduced pressure. The crude product was purified by column chromatography [SiO2; light petroleum to 4:1 light petroleum-ethyl acetate] to give the title compound as a colourless oil, which crystallised to give fine colourless needles upon standing overnight (4 g, 26%). Rf=0.26 [4:1 light petroleum-ethyl acetate]. 1H NMR δ 2.21 (3 H, s), 4.89-4.95 (1 H, br, s), 6.96-6.97 (1 H, br, m), 6.99-7.00 (2 H, m). the reaction was subsequently heated at reflux for 2 hours was extracted with ethyl acetate (2×200 mL) the combined organic extracts were washed with aqueous potassium hydroxide solution (˜1 M, 200 mL) dried (magnesium sulphate) concentrated under reduced pressure The crude product was purified by column chromatography [SiO2; light petroleum to 4:1 light petroleum-ethyl acetate]

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

Procedure: A solution of concentrated sulphuric acid (6 mL) in distilled water (75 mL) was added to 5-bromo-2-methylaniline (1 g, 5.38 mmol). The resultant suspension was heated to 90° C. and stirred for 4.5 h. The reaction mixture was then cooled using an ice bath and a solution of sodium nitrite (384 mg, 5.57 mmol) in water (5 mL) was added to the reaction mixture at 0° C. The reaction was then allowed to warm to ambient temperature. The reaction mixture was then added to a solution of concentrated sulphuric acid (6 mL) in water (75 mL) which had been preheated to 90° C. The reaction mixture was stirred for 1 h at 90° C. and allowed to cool, on standing, overnight. A precipitate was observed in the reaction mixture. The precipitate was collected by filtration, washed with water, and dried in a vacuum oven to afford 5-bromo-2-methylphenol as a brown solid (510 mg, 2.73 mmol, 51%). M.S. (ESI) (m/z) 185, 187[M−H]− The reaction mixture was then cooled had been preheated to 90° C The reaction mixture was stirred for 1 h at 90° C. to cool, on standing, overnight The precipitate was collected by filtration washed with water dried in a vacuum oven

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

Procedure: A mixture of 5-bromo-2-methylphenol (1.0 g), phenylboronic acid (1.30 g), Cu(OAc)2 (0.97 g), and triethylamine (2.98 mL) in dichloromethane (50 mL) was stirred for 4 days. The mixture was diluted with ethyl acetate, washed four times with 1M aqueous NaOH solution and once with brine, dried over Na2SO4, filtered, and concentrated. The crude product was chromatographed on silica gel using 2% ethyl acetate in hexanes to afford the title compound. washed four times with 1M aqueous NaOH solution once with brine, dried over Na2SO4 filtered concentrated The crude product was chromatographed on silica gel using 2% ethyl acetate in hexanes

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-bromo-2-methylphenol (1.0 g, 0.005 mol) in DMF (10 mL) was added K2CO3 (1.38 g, 0.01 mol) at RT. 2-Chloro-5-(trifluoromethyl)pyridine (908 mg, 0.005 mol) was added and the reaction was refluxed at 110° C. for 12 h. The reaction mixture was quenched with water and extracted with EtOAc three times. The organic extract was washed with water and brine, dried over sodium sulfate and concentrated under reduced pressure to give the title compound (1.5 g, 88%). 1H NMR (500 MHz, CDCl3): δ 8.42 (s, 1H), 7.92 (d, J=2.15 Hz, 1H), 7.32 (t, J=6.45 1H), 7.23 (d, J=1.5 Hz, 1H), 7.17 (d, J=8.05 Hz, 1H), 7.03 (d, J=8.65 Hz, 1H), 2.12 (s, 3H). The reaction mixture was quenched with water extracted with EtOAc three times The organic extract was washed with water and brine dried over sodium sulfate concentrated under reduced pressure

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

Procedure: 5-Amino-2-methylphenol (5 g, 0.04 mol) was dissolved in HBr (20 mL) and H2O (20 mL) was added dropwise maintaining a temperature below 0° C. The resulting mixture was stirred for 5 min and a solution of NaNO2 (2.76 g, 0.04 mol) in H2O (7.5 mL) was added dropwise. The mixture was stirred for 30 min below 0° C. Then a solution of cuprous bromide (5.73 g, 0.04 mol) in HBr (7.5 mL) cooled to 0° C. was added dropwise. The resulting mixture was warmed to RT and then refluxed for 2 h. The reaction was cooled and filtered through celite. The filtrate was diluted with water and extracted with EtOAc. The organic extract was dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by column chromatography (2.5% EtOAc-97.5% Hexane) to give the pure title compound (1.57 g, 20%). 1H NMR (500 MHz, CDCl3): δ 6.97 (s, 3H), 4.89 (s, 1H), 2.19 (s, 3H). maintaining a temperature below 0° C The mixture was stirred for 30 min below 0° C was added dropwise refluxed for 2 h The reaction was cooled filtered through celite The filtrate was diluted with water extracted with EtOAc The organic extract was dried over Na2SO4 concentrated under reduced pressure The residue was purified by column chromatography (2.5% EtOAc-97.5% Hexane)

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

Procedure: A mixture of 5-bromo-2-methylphenol (1.0 g), phenylboronic acid (1.30 g), Cu(OAc)2 (0.97 g), and triethylamine (2.98 mL) in dichloromethane (50 mL) was stirred for 4 days. The mixture was diluted with ethyl acetate, washed four times with 1M aqueous NaOH solution and once with brine, dried over Na2SO4, filtered, and concentrated. The crude product was chromatographed on silica gel using 2% ethyl acetate in hexanes to afford the title compound. washed four times with 1M aqueous NaOH solution once with brine, dried over Na2SO4 filtered concentrated The crude product was chromatographed on silica gel using 2% ethyl acetate in hexanes