tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-[4-(trans-2-aminocyclopropyl)phenyl]-3-(trifluoromethyl)benzamide hydrochloride (60 mg) in methanol (1.5 mL)/THF (1.5 mL) were added tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (60.2 mg) and sodium hydrogen carbonate (28.3 mg). The mixture was stirred at 60° C. for 1 hr, and ice-cooled to 0° C. and sodium borohydride (12.7 mg) was added. The mixture was stirred at room temperature for 2 hr, and ice-cooled to 0° C. and saturated aqueous sodium hydrogen carbonate solution was added. The mixture was extracted with ethyl acetate, and the extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/methanol) to give the title compound (62 mg). ice-cooled to 0° C. The mixture was stirred at room temperature for 2 hr ice-cooled to 0° C. The mixture was extracted with ethyl acetate the extract was washed with saturated brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure The residue was purified by silica gel column chromatography (ethyl acetate/methanol)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-[4-(trans-2-aminocyclopropyl)phenyl]-3-(trifluoromethyl)benzamide hydrochloride (60 mg) in methanol (1.5 mL)/THF (1.5 mL) were added tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (60.2 mg) and sodium hydrogen carbonate (28.3 mg). The mixture was stirred at 60° C. for 1 hr, and ice-cooled to 0° C. and sodium borohydride (12.7 mg) was added. The mixture was stirred at room temperature for 2 hr, and ice-cooled to 0° C. and saturated aqueous sodium hydrogen carbonate solution was added. The mixture was extracted with ethyl acetate, and the extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/methanol) to give the title compound (62 mg). ice-cooled to 0° C. The mixture was stirred at room temperature for 2 hr ice-cooled to 0° C. The mixture was extracted with ethyl acetate the extract was washed with saturated brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure The residue was purified by silica gel column chromatography (ethyl acetate/methanol)

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

Procedure: Methylmagnesium bromide (3 M solution in ether, 1.2 mL, 3.6 mmol) was added to a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (328 mg, 1.2 mmol), in tetrahydrofuran (20 mL) at 0° C. and the resulting mixture was stirred at this temperature one hour. The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) and diluted with ethyl acetate (80 mL). The organic portion was separated, washed with water, then brine solution, dried over sodium sulfate, filtered and concentrated. The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer assigned as (±)-tert-butyl (2R,4S)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (100 mg, 29% yield), LC-MS for C17H25NO3: 292 (MH+); and the second eluting isomer assigned as (±)-tert-butyl (2R,4R)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (120 mg, 35% yield), MS (EI) for C17H25NO3: 292 (MH+). The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) diluted with ethyl acetate (80 mL) The organic portion was separated washed with water brine solution, dried over sodium sulfate filtered concentrated The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer

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

Procedure: Methylmagnesium bromide (3 M solution in ether, 1.2 mL, 3.6 mmol) was added to a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (328 mg, 1.2 mmol), in tetrahydrofuran (20 mL) at 0° C. and the resulting mixture was stirred at this temperature one hour. The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) and diluted with ethyl acetate (80 mL). The organic portion was separated, washed with water, then brine solution, dried over sodium sulfate, filtered and concentrated. The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer assigned as (±)-tert-butyl (2R,4S)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (100 mg, 29% yield), LC-MS for C17H25NO3: 292 (MH+); and the second eluting isomer assigned as (±)-tert-butyl (2R,4R)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (120 mg, 35% yield), MS (EI) for C17H25NO3: 292 (MH+). The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) diluted with ethyl acetate (80 mL) The organic portion was separated washed with water brine solution, dried over sodium sulfate filtered concentrated The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of potassium tert-butoxide (1.25 g, 11.1 mmol) and methyltriphenylphosphonium bromide (3.86 g, 1.1 mmol) in tetrahydrofuran (100 mL) was stirred at 40° C. for 30 minutes. The mixture was then cooled to room temperature and a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (2.35 g, 8.5 mmol) in tetrahydrofuran (30 mL) was added slowly. The reaction mixture was stirred at 40° C. for 24 hours. The mixture was cooled to room temperature and quenched by the addition of water and diluted with ethyl acetate (250 mL), The organic layer was separated then washed with water, 10% aqueous citric acid and brine, dried over anhydrous sodium sulfate, filtered and concentrated. Column chromatography on silica gel (hexane:ethyl acetate 95:5 to 9:1) provided tert-butyl 4-methylene-2-phenylpiperidine-1-carboxylate (2.24 g, 96%). 1H NMR (400 MHz, CDCl3): 7.31 (m, 4H), 7.21 (m, 1H), 5.48 (br d, 1H), 4.84 (dd, 2H), 4.07 (br dd, 1H), 2.85 (br, t, 1H), 2.78 (dtr, 1H), 2.64 (dd, 1H), 2.28 (dtr, 1H), 2.20 (br d, 1H), 1.42 (s, 9H). GC/MS (EI) for C17H23NO2: 273 (M+). The mixture was then cooled to room temperature The reaction mixture was stirred at 40° C. for 24 hours The mixture was cooled to room temperature quenched by the addition of water diluted with ethyl acetate (250 mL) The organic layer was separated then washed with water, 10% aqueous citric acid and brine dried over anhydrous sodium sulfate filtered concentrated

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of potassium tert-butoxide (1.25 g, 11.1 mmol) and methyltriphenylphosphonium bromide (3.86 g, 1.1 mmol) in tetrahydrofuran (100 mL) was stirred at 40° C. for 30 minutes. The mixture was then cooled to room temperature and a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (2.35 g, 8.5 mmol) in tetrahydrofuran (30 mL) was added slowly. The reaction mixture was stirred at 40° C. for 24 hours. The mixture was cooled to room temperature and quenched by the addition of water and diluted with ethyl acetate (250 mL), The organic layer was separated then washed with water, 10% aqueous citric acid and brine, dried over anhydrous sodium sulfate, filtered and concentrated. Column chromatography on silica gel (hexane:ethyl acetate 95:5 to 9:1) provided tert-butyl 4-methylene-2-phenylpiperidine-1-carboxylate (2.24 g, 96%). 1H NMR (400 MHz, CDCl3): 7.31 (m, 4H), 7.21 (m, 1H), 5.48 (br d, 1H), 4.84 (dd, 2H), 4.07 (br dd, 1H), 2.85 (br, t, 1H), 2.78 (dtr, 1H), 2.64 (dd, 1H), 2.28 (dtr, 1H), 2.20 (br d, 1H), 1.42 (s, 9H). GC/MS (EI) for C17H23NO2: 273 (M+). The mixture was then cooled to room temperature The reaction mixture was stirred at 40° C. for 24 hours The mixture was cooled to room temperature quenched by the addition of water diluted with ethyl acetate (250 mL) The organic layer was separated then washed with water, 10% aqueous citric acid and brine dried over anhydrous sodium sulfate filtered concentrated

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of N-[4-(trans-2-aminocyclopropyl)phenyl]-3-(trifluoromethyl)benzamide hydrochloride (60 mg) in methanol (1.5 mL)/THF (1.5 mL) were added tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (60.2 mg) and sodium hydrogen carbonate (28.3 mg). The mixture was stirred at 60° C. for 1 hr, and ice-cooled to 0° C. and sodium borohydride (12.7 mg) was added. The mixture was stirred at room temperature for 2 hr, and ice-cooled to 0° C. and saturated aqueous sodium hydrogen carbonate solution was added. The mixture was extracted with ethyl acetate, and the extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/methanol) to give the title compound (62 mg). ice-cooled to 0° C. The mixture was stirred at room temperature for 2 hr ice-cooled to 0° C. The mixture was extracted with ethyl acetate the extract was washed with saturated brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure The residue was purified by silica gel column chromatography (ethyl acetate/methanol)

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

Procedure: Methylmagnesium bromide (3 M solution in ether, 1.2 mL, 3.6 mmol) was added to a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (328 mg, 1.2 mmol), in tetrahydrofuran (20 mL) at 0° C. and the resulting mixture was stirred at this temperature one hour. The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) and diluted with ethyl acetate (80 mL). The organic portion was separated, washed with water, then brine solution, dried over sodium sulfate, filtered and concentrated. The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer assigned as (±)-tert-butyl (2R,4S)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (100 mg, 29% yield), LC-MS for C17H25NO3: 292 (MH+); and the second eluting isomer assigned as (±)-tert-butyl (2R,4R)-4-methyl-2-phenylpiperidin-4-ol-1-carboxylate (120 mg, 35% yield), MS (EI) for C17H25NO3: 292 (MH+). The reaction mixture was then quenched with saturated aqueous ammonium chloride solution (20 mL) diluted with ethyl acetate (80 mL) The organic portion was separated washed with water brine solution, dried over sodium sulfate filtered concentrated The residue purified by silica gel chromatography (25% to 70% ethyl acetate in hexane gradient) to give the first eluting isomer

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of potassium tert-butoxide (1.25 g, 11.1 mmol) and methyltriphenylphosphonium bromide (3.86 g, 1.1 mmol) in tetrahydrofuran (100 mL) was stirred at 40° C. for 30 minutes. The mixture was then cooled to room temperature and a solution of tert-butyl 4-oxo-2-phenylpiperidine-1-carboxylate (2.35 g, 8.5 mmol) in tetrahydrofuran (30 mL) was added slowly. The reaction mixture was stirred at 40° C. for 24 hours. The mixture was cooled to room temperature and quenched by the addition of water and diluted with ethyl acetate (250 mL), The organic layer was separated then washed with water, 10% aqueous citric acid and brine, dried over anhydrous sodium sulfate, filtered and concentrated. Column chromatography on silica gel (hexane:ethyl acetate 95:5 to 9:1) provided tert-butyl 4-methylene-2-phenylpiperidine-1-carboxylate (2.24 g, 96%). 1H NMR (400 MHz, CDCl3): 7.31 (m, 4H), 7.21 (m, 1H), 5.48 (br d, 1H), 4.84 (dd, 2H), 4.07 (br dd, 1H), 2.85 (br, t, 1H), 2.78 (dtr, 1H), 2.64 (dd, 1H), 2.28 (dtr, 1H), 2.20 (br d, 1H), 1.42 (s, 9H). GC/MS (EI) for C17H23NO2: 273 (M+). The mixture was then cooled to room temperature The reaction mixture was stirred at 40° C. for 24 hours The mixture was cooled to room temperature quenched by the addition of water diluted with ethyl acetate (250 mL) The organic layer was separated then washed with water, 10% aqueous citric acid and brine dried over anhydrous sodium sulfate filtered concentrated