2-bromo-3-methyl-1-oxidopyridin-1-ium

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

Procedure: To a solution of 2-bromo-3-methylpyridine 1-oxide (compound 350.1, 5.65 g, 30.1 mmol, 1.00 equiv) in acetonitrile (50 mL) were added triethylamine (6.10 g, 60.3 mmol, 2.00 equiv) and TMSCN (8.90 g, 3.00 equiv). The resulting solution was heated to reflux and stiffed overnight in an oil bath, then cooled to ambient temperature and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:5) as eluent to yield 2.00 g (34%) of the title compound as a yellow solid. The resulting solution was heated to reflux and stiffed overnight in an oil bath concentrated under reduced pressure The residue was purified

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

Procedure: To a solution of 2-bromo-3-methylpyridine 1-oxide (compound 350.1, 5.65 g, 30.1 mmol, 1.00 equiv) in acetonitrile (50 mL) were added triethylamine (6.10 g, 60.3 mmol, 2.00 equiv) and TMSCN (8.90 g, 3.00 equiv). The resulting solution was heated to reflux and stiffed overnight in an oil bath, then cooled to ambient temperature and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:5) as eluent to yield 2.00 g (34%) of the title compound as a yellow solid. The resulting solution was heated to reflux and stiffed overnight in an oil bath concentrated under reduced pressure The residue was purified

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

Procedure: A mixture of 2-bromo-3-methyl-pyridine (1000 mg, 5.81 mmol) and 3-chloroperoxybenzoic acid (2150 mg, 8.72 mmol) in dichloromethane (8 mL) was stirred overnight at room temperature. The reaction mixture was diluted with DCM (50 mL) and washed with saturated aqueous sodium thiosulfite (10 mL) followed by saturated aqueous sodium bicarbonate (10 mL). The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM). Desired fractions were combined and evaporated in vacuo to afford the title compound as white solid (851 mg, 78%), which was used in the next step without further purification. washed with saturated aqueous sodium thiosulfite (10 mL) The organic layer was separated dried over sodium sulfate filtered concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM) evaporated in vacuo

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

Procedure: A solution of 2-bromo-3-methylpyridine (10.0 mL, 0.0898 mol) in dichloromethane (150 mL) at 0° C. was treated with mCPBA (77%, 22.1 g, 0.0987 mol) in three equivalent portions. The mixture was warmed to room temperature, stirred for 18 hours, cooled to 0° C., and treated with 1N NaOH (50 mL). The organic phase was washed with 1N NaOH and saturated NaHCO3, dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol to provide 7.83 g (47%) of the desired product. MS (DCI/NH3) m/z 187.9 (M+H)+; 1H NMR (CDCl3) δ 8.28-8.26 (m, 1H), 7.15-7.09 (m, 2H), 2.46 (s, 3H). cooled to 0° C. The organic phase was washed with 1N NaOH and saturated NaHCO3 dried (MgSO4) filtered concentrated The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol

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

Procedure: A solution of 2-bromo-3-methylpyridine (10.0 mL, 0.0898 mol) in dichloromethane (150 mL) at 0° C. was treated with mCPBA (77%, 22.1 g, 0.0987 mol) in three equivalent portions. The mixture was warmed to room temperature, stirred for 18 hours, cooled to 0° C., and treated with 1N NaOH (50 mL). The organic phase was washed with 1N NaOH and saturated NaHCO3, dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol to provide 7.83 g (47%) of the desired product. MS (DCI/NH3) m/z 187.9 (M+H)+; 1H NMR (CDCl3) δ 8.28-8.26 (m, 1H), 7.15-7.09 (m, 2H), 2.46 (s, 3H). cooled to 0° C. The organic phase was washed with 1N NaOH and saturated NaHCO3 dried (MgSO4) filtered concentrated The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol

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

Procedure: A solution of 2-bromo-3-methylpyridine (10.0 mL, 0.0898 mol) in dichloromethane (150 mL) at 0° C. was treated with mCPBA (77%, 22.1 g, 0.0987 mol) in three equivalent portions. The mixture was warmed to room temperature, stirred for 18 hours, cooled to 0° C., and treated with 1N NaOH (50 mL). The organic phase was washed with 1N NaOH and saturated NaHCO3, dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol to provide 7.83 g (47%) of the desired product. MS (DCI/NH3) m/z 187.9 (M+H)+; 1H NMR (CDCl3) δ 8.28-8.26 (m, 1H), 7.15-7.09 (m, 2H), 2.46 (s, 3H). cooled to 0° C. The organic phase was washed with 1N NaOH and saturated NaHCO3 dried (MgSO4) filtered concentrated The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol

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

Procedure: A mixture of 2-bromo-3-methyl-pyridine (1000 mg, 5.81 mmol) and 3-chloroperoxybenzoic acid (2150 mg, 8.72 mmol) in dichloromethane (8 mL) was stirred overnight at room temperature. The reaction mixture was diluted with DCM (50 mL) and washed with saturated aqueous sodium thiosulfite (10 mL) followed by saturated aqueous sodium bicarbonate (10 mL). The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM). Desired fractions were combined and evaporated in vacuo to afford the title compound as white solid (851 mg, 78%), which was used in the next step without further purification. washed with saturated aqueous sodium thiosulfite (10 mL) The organic layer was separated dried over sodium sulfate filtered concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM) evaporated in vacuo

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

Procedure: A solution of 2-bromo-3-methylpyridine (10.0 mL, 0.0898 mol) in dichloromethane (150 mL) at 0° C. was treated with mCPBA (˜77%, 22.1 g, 0.0987 mol) in three equivalent portions. The mixture was warmed to room temperature, stirred for 18 hours, cooled to 0° C., and treated with 1N NaOH (50 mL). The organic phase was washed with 1N NaOH and saturated NaHCO3, dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol to provide 7.83 g (47%) of the desired product. MS (DCI/NH3) m/z 187.9 (M+H)+; 1H NMR (CDCl3) δ 8.28-8.26 (m, 1H), 7.15-7.09 (m, 2H), 2.46 (s, 3H). cooled to 0° C. The organic phase was washed with 1N NaOH and saturated NaHCO3 dried (MgSO4) filtered concentrated The concentrate was purified by flash column chromatography on silica gel with ethyl acetate and 9:1 ethyl acetate/methanol

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

Procedure: To a solution of 2-bromo-3-methylpyridine 1-oxide (compound 350.1, 5.65 g, 30.1 mmol, 1.00 equiv) in acetonitrile (50 mL) were added triethylamine (6.10 g, 60.3 mmol, 2.00 equiv) and TMSCN (8.90 g, 3.00 equiv). The resulting solution was heated to reflux and stiffed overnight in an oil bath, then cooled to ambient temperature and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:5) as eluent to yield 2.00 g (34%) of the title compound as a yellow solid. The resulting solution was heated to reflux and stiffed overnight in an oil bath concentrated under reduced pressure The residue was purified

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

Procedure: A mixture of 2-bromo-3-methyl-pyridine (1000 mg, 5.81 mmol) and 3-chloroperoxybenzoic acid (2150 mg, 8.72 mmol) in dichloromethane (8 mL) was stirred overnight at room temperature. The reaction mixture was diluted with DCM (50 mL) and washed with saturated aqueous sodium thiosulfite (10 mL) followed by saturated aqueous sodium bicarbonate (10 mL). The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM). Desired fractions were combined and evaporated in vacuo to afford the title compound as white solid (851 mg, 78%), which was used in the next step without further purification. washed with saturated aqueous sodium thiosulfite (10 mL) The organic layer was separated dried over sodium sulfate filtered concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-10% methanol in DCM) evaporated in vacuo