Methyl 4-hydroxybicyclo[2.2.2]octane-1-carboxylate

反応条件: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of methyl 4-hydroxybicyclo[2.2.2]octane-1-carboxylate (8.9 g, 48 mmol) in anhydrous THF (150 mL) at −78° C. was added n-butyl lithium (23 mL, 57.5 mmol, 2.5 M solution in hexane) over 30 min, followed by the slow addition of iodomethane (14 g, 98 mmol). The mixture was stirred at 60° C. for 3 h and quenched by addition of saturated aqueous ammonium chloride solution (50 mL). The resulting solution was concentrated and the residue was extracted with ethyl acetate (150 mL×2). The organic layers were combined and washed with brine, dried over magnesium sulfate and then concentrated. The residue was purified by silica gel column chromatography (10% ethyl acetate in petroleum ether) to give the title product (6.5 g, 67%). 1H NMR (400 MHz, CDCl3) δ ppm 3.64 (s, 3H), 3.18 (s, 3H), 1.95-1.89 (m, 6H), 1.70-1.65 (m. 6H). quenched by addition of saturated aqueous ammonium chloride solution (50 mL) The resulting solution was concentrated the residue was extracted with ethyl acetate (150 mL×2) washed with brine dried over magnesium sulfate concentrated The residue was purified by silica gel column chromatography (10% ethyl acetate in petroleum ether)

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

実験手順: To a solution of 4-hydroxybicyclo[2.2.2]octane-1-carboxylic acid (14 g, 82.4 mmol) in methanol (300 mL) was added concentrated sulfuric acid (1 mL). The mixture was refluxed for 10 h and then concentrated. The reside was dissolved in water (100 mL) and the mixture was extracted with ethyl acetate (200 mL×2). The combined organic phases were washed with saturated aqueous sodium hydrogen carbonate solution (100 mL), brine (100 mL) and dried over sodium sulfate. Concentration gave the title compound (14.5 g, yield 96%). 1H NMR (400 MHz, CDCl3) δ ppm 3.64 (s, 3H), 1.96-1.89 (m, 6H), 1.69-1.64 (m. 6H). The mixture was refluxed for 10 h concentrated The reside was dissolved in water (100 mL) the mixture was extracted with ethyl acetate (200 mL×2) The combined organic phases were washed with saturated aqueous sodium hydrogen carbonate solution (100 mL), brine (100 mL) dried over sodium sulfate Concentration

反応条件: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of methyl 4-hydroxybicyclo[2.2.2]octane-1-carboxylate (8.9 g, 48 mmol) in anhydrous THF (150 mL) at −78° C. was added n-butyl lithium (23 mL, 57.5 mmol, 2.5 M solution in hexane) over 30 min, followed by the slow addition of iodomethane (14 g, 98 mmol). The mixture was stirred at 60° C. for 3 h and quenched by addition of saturated aqueous ammonium chloride solution (50 mL). The resulting solution was concentrated and the residue was extracted with ethyl acetate (150 mL×2). The organic layers were combined and washed with brine, dried over magnesium sulfate and then concentrated. The residue was purified by silica gel column chromatography (10% ethyl acetate in petroleum ether) to give the title product (6.5 g, 67%). 1H NMR (400 MHz, CDCl3) δ ppm 3.64 (s, 3H), 3.18 (s, 3H), 1.95-1.89 (m, 6H), 1.70-1.65 (m. 6H). quenched by addition of saturated aqueous ammonium chloride solution (50 mL) The resulting solution was concentrated the residue was extracted with ethyl acetate (150 mL×2) washed with brine dried over magnesium sulfate concentrated The residue was purified by silica gel column chromatography (10% ethyl acetate in petroleum ether)

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

実験手順: To a solution of 4-hydroxybicyclo[2.2.2]octane-1-carboxylic acid (14 g, 82.4 mmol) in methanol (300 mL) was added concentrated sulfuric acid (1 mL). The mixture was refluxed for 10 h and then concentrated. The reside was dissolved in water (100 mL) and the mixture was extracted with ethyl acetate (200 mL×2). The combined organic phases were washed with saturated aqueous sodium hydrogen carbonate solution (100 mL), brine (100 mL) and dried over sodium sulfate. Concentration gave the title compound (14.5 g, yield 96%). 1H NMR (400 MHz, CDCl3) δ ppm 3.64 (s, 3H), 1.96-1.89 (m, 6H), 1.69-1.64 (m. 6H). The mixture was refluxed for 10 h concentrated The reside was dissolved in water (100 mL) the mixture was extracted with ethyl acetate (200 mL×2) The combined organic phases were washed with saturated aqueous sodium hydrogen carbonate solution (100 mL), brine (100 mL) dried over sodium sulfate Concentration