tert-butyl 4-benzyl-4-hydroxypiperidine-1-carboxylate

反応条件: temp:-71.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a cooled (-71° C.) and stirred solution of diethylaminosulfur trifluoride (634 μl, 4.80 mmol) in anhydrous dichloromethane (15 ml) was added dropwise, via cannula, a solution of 1-tert-butyloxycarbonyl-4-benzyl-4-hydroxypiperidine (700 mg, 2.40 mmol) in anhydrous dichloromethane (15 ml) over 20 minutes, under nitrogen. After a further 50 minutes at -75° C., the mixture was warmed to -10° C. and stirred for a further 2 hours. Water (20 ml) and saturated aqueous potassium carbonate (7 ml) were added and products were extracted with diethyl ether (1×70 ml). The organic solution was washed with brine (1×25 ml), dried (MgSO4) and concentrated. Flash chromatography of the residue (silica gel, hexane-diethyl ether, 86:14) gave 190 mg of 1-tert-butyloxycarbonyl-3,4-dehydro-4-benzylpiperidine and 360 mg (51%) of the title compound as pale yellow oils; δH (360 MHz, CDCl3) 1.44 (9H, s), 1.46-1.78 (4H, m), 2.90 (2H, d, J=22 Hz), 2.98-3.08 (2H, m), 3.86-3.94 (2H, m), 7.16-7.34 (5H, m); m/z (ES) 294 (M+ 1). was added dropwise, via cannula the mixture was warmed to -10° C. products were extracted with diethyl ether (1×70 ml) The organic solution was washed with brine (1×25 ml) dried (MgSO4) concentrated

反応条件: temp:-71.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a cooled (-71° C.) and stirred solution of diethylaminosulfur trifluoride (634 μl, 4.80 mmol) in anhydrous dichloromethane (15 ml) was added dropwise, via cannula, a solution of 1-tert-butyloxycarbonyl-4-benzyl-4-hydroxypiperidine (700 mg, 2.40 mmol) in anhydrous dichloromethane (15 ml) over 20 minutes, under nitrogen. After a further 50 minutes at -75° C., the mixture was warmed to -10° C. and stirred for a further 2 hours. Water (20 ml) and saturated aqueous potassium carbonate (7 ml) were added and products were extracted with diethyl ether (1×70 ml). The organic solution was washed with brine (1×25 ml), dried (MgSO4) and concentrated. Flash chromatography of the residue (silica gel, hexane-diethyl ether, 86:14) gave 190 mg of 1-tert-butyloxycarbonyl-3,4-dehydro-4-benzylpiperidine and 360 mg (51%) of the title compound as pale yellow oils; δH (360 MHz, CDCl3) 1.44 (9H, s), 1.46-1.78 (4H, m), 2.90 (2H, d, J=22 Hz), 2.98-3.08 (2H, m), 3.86-3.94 (2H, m), 7.16-7.34 (5H, m); m/z (ES) 294 (M+ 1). was added dropwise, via cannula the mixture was warmed to -10° C. products were extracted with diethyl ether (1×70 ml) The organic solution was washed with brine (1×25 ml) dried (MgSO4) concentrated

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

実験手順: A solution of 4-hydroxy-4-benzyl piperidine (0.66 g, 3.5 mmol) in 1M NaOH (7 mL, 7 mmol) and dioxane (5 mL) at 0° C. was treated with BOC2O (0.76 g, 3.5 mmol), warmed to room temperature, stirred for 16 hours, adjusted to pH<7 with 10% citric acid, and extracted twice with ethyl acetate. The combined extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated to provide the desired product. extracted twice with ethyl acetate The combined extracts were washed with water and brine dried (Na2SO4) filtered concentrated

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

実験手順: A solution of 4-hydroxy-4-benzyl piperidine (0.66 g, 3.5 mmol) in 1M NaOH (7 mL, 7 mmol) and dioxane (5 mL) at 0° C. was treated with BOC2O (0.76 g, 3.5 mmol), warmed to room temperature, stirred for 16 hours, adjusted to pH<7 with 10% citric acid, and extracted twice with ethyl acetate. The combined extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated to provide the desired product. extracted twice with ethyl acetate The combined extracts were washed with water and brine dried (Na2SO4) filtered concentrated

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

実験手順: A solution of 4-hydroxy-4-benzyl piperidine (0.66 g, 3.5 mmol) in 1M NaOH (7 mL, 7 mmol) and dioxane (5 mL) at 0° C. was treated with BOC2O (0.76 g, 3.5 mmol), warmed to room temperature, stirred for 16 hours, adjusted to pH<7 with 10% citric acid, and extracted twice with ethyl acetate. The combined extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated to provide the desired product. extracted twice with ethyl acetate The combined extracts were washed with water and brine dried (Na2SO4) filtered concentrated

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

実験手順: A solution of 4-hydroxy-4-benzyl piperidine (0.66 g, 3.5 mmol) in 1M NaOH (7 mL, 7 mmol) and dioxane (5 mL) at 0° C. was treated with BOC2O (0.76 g, 3.5 mmol), warmed to room temperature, stirred for 16 hours, adjusted to pH<7 with 10% citric acid, and extracted twice with ethyl acetate. The combined extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated to provide the desired product. extracted twice with ethyl acetate The combined extracts were washed with water and brine dried (Na2SO4) filtered concentrated

反応条件: temp:-71.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a cooled (-71° C.) and stirred solution of diethylaminosulfur trifluoride (634 μl, 4.80 mmol) in anhydrous dichloromethane (15 ml) was added dropwise, via cannula, a solution of 1-tert-butyloxycarbonyl-4-benzyl-4-hydroxypiperidine (700 mg, 2.40 mmol) in anhydrous dichloromethane (15 ml) over 20 minutes, under nitrogen. After a further 50 minutes at -75° C., the mixture was warmed to -10° C. and stirred for a further 2 hours. Water (20 ml) and saturated aqueous potassium carbonate (7 ml) were added and products were extracted with diethyl ether (1×70 ml). The organic solution was washed with brine (1×25 ml), dried (MgSO4) and concentrated. Flash chromatography of the residue (silica gel, hexane-diethyl ether, 86:14) gave 190 mg of 1-tert-butyloxycarbonyl-3,4-dehydro-4-benzylpiperidine and 360 mg (51%) of the title compound as pale yellow oils; δH (360 MHz, CDCl3) 1.44 (9H, s), 1.46-1.78 (4H, m), 2.90 (2H, d, J=22 Hz), 2.98-3.08 (2H, m), 3.86-3.94 (2H, m), 7.16-7.34 (5H, m); m/z (ES) 294 (M+ 1). was added dropwise, via cannula the mixture was warmed to -10° C. products were extracted with diethyl ether (1×70 ml) The organic solution was washed with brine (1×25 ml) dried (MgSO4) concentrated