3-(chloromethyl)-2-methyl-1-oxidopyridin-1-ium

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of 3-chloromethyl-2-methylpyridine from Step 2 above (0.50 g; 3.5 mmol) in CHCl3 (40 mL) was added m-chloroperoxybenzoic acid (1.1 g of 55:45 mCPBA:mCBA; 3.5 mmol). After 1.5 h, TLC analysis indicated complete conversion to a lower Rf product. The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water, dried (MgSO4), filtered, and evaporated under reduced pressure. The residue was purified by pressurized silica gel column chromatography using 97:3 CH2Cl2 :MeOH as eluant. 3-Chloromethyl-2-methylpyridine N-oxide was obtained as a solid (TLC: Rf =0.30 (97:3 CH2Cl2 :MeOH); FAB MS m/z 158 (M+ +H)). The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water dried (MgSO4) filtered evaporated under reduced pressure The residue was purified by pressurized silica gel column chromatography

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of 3-chloromethyl-2-methylpyridine from Step 2 above (0.50 g; 3.5 mmol) in CHCl3 (40 mL) was added m-chloroperoxybenzoic acid (1.1 g of 55:45 mCPBA:mCBA; 3.5 mmol). After 1.5 h, TLC analysis indicated complete conversion to a lower Rf product. The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water, dried (MgSO4), filtered, and evaporated under reduced pressure. The residue was purified by pressurized silica gel column chromatography using 97:3 CH2Cl2 :MeOH as eluant. 3-Chloromethyl-2-methylpyridine N-oxide was obtained as a solid (TLC: Rf =0.30 (97:3 CH2Cl2 :MeOH); FAB MS m/z 158 (M+ +H)). The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water dried (MgSO4) filtered evaporated under reduced pressure The residue was purified by pressurized silica gel column chromatography

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Prepared essentially according to the procedure of I. M. Bell et al., J. Med. Chem. 41, 2146–2163 (1998). To a stirred solution of the crude 3-hydroxymethyl-2-methyl-pyridine of Step B (1.35 g, 9.53 mmol) in chloroform (50 mL) was added 90% m-chloroperbenzoic acid (2.0 g, 10.4 mmol). After stirring overnight at room temperature, an additional quantity of 90% m-chloroperbenzoic acid (1.0 g, 5.2 mmol) was added. The reaction mixture was stirred for an additional 3 hours and then quenched with saturated aqueous sodium bicarbonate. The organic layer was washed with water, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give a yellow solid. Purification by flash chromatography using a solvent system of 3% methanol in chloroform provided 0.85 g of the title compound as a brown-orange amorphous solid. Prepared essentially The reaction mixture was stirred for an additional 3 hours quenched with saturated aqueous sodium bicarbonate The organic layer was washed with water dried over anhydrous sodium sulfate filtered concentrated in vacuo to give a yellow solid Purification by flash chromatography

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of 3-chloromethyl-2-methylpyridine (0.50 g, 3.5 mmol) from step 2 above in CHCl3 (40 mL) was added MCPBA (1.1 g of 50% MCPBA by weight; 3.5 mmol). After 1.5 h, the solution was extracted with saturated aqueous NaHCO3 (40 mL), water (40 mL), dried (MgSO4), filtered, and evaporated under reduced pressure. The residue was purified by pressurized silica gel column chromatography using 97:3 CH2Cl2 :MeOH as eluant. 3-Chloromethyl-2-methylpyridine-N-oxide was obtained as a solid (TLC: Rf = 0.30 (97:3 CH2Cl2 :MeOH); FAB MS m/z 158 (M+ +H)). the solution was extracted with saturated aqueous NaHCO3 (40 mL), water (40 mL) dried (MgSO4) filtered evaporated under reduced pressure The residue was purified by pressurized silica gel column chromatography

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of 3-chloromethyl-2-methylpyridine from Step 2 above (0.50 g; 3.5 mmol) in CHCl3 (40 mL) was added m-chloroperoxybenzoic acid (1.1 g of 55:45 mCPBA:mCBA; 3.5 mmol). After 1.5 h, TLC analysis indicated complete conversion to a lower Rf product. The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water, dried (MgSO4), filtered, and evaporated under reduced pressure. The residue was purified by pressurized silica gel column chromatography using 97:3 CH2Cl2 :MeOH as eluant. 3-Chloromethyl-2-methylpyridine N-oxide was obtained as a solid (TLC: Rf =0.30 (97:3 CH2Cl2 :MeOH); FAB MS m/z 158 (M+ +H)). The solution was extracted with equal volumes of saturated aqueous NaHCO3 and water dried (MgSO4) filtered evaporated under reduced pressure The residue was purified by pressurized silica gel column chromatography