tert-butyl N-(2-oxopiperidin-3-yl)carbamate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (3RS)-3-tert-butoxycarbonylaminopiperidin-2-one (16.07 g) was dissolved in N,N-dimethylformamide (DMF, 350 ml) and the mixture was cooled to 0° C. Sodium hydride (3.6 g of a 50% dispersion in mineral oil) was added and then the mixture was stirred at 0° C. for one hour. A solution of ethyl bromoacetate (13.78 g) in DMF (20 ml) was then added. The mixture was stirred for 16 hours at ambient temperature, then cooled to 0° C. and ice added. Volatile material was removed by evaporation and the residue was partitioned between ethyl acetate and brine. The organic layer was washed with brine, dried over Na2SO4 and concentrated by evaporation. The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.) to give ethyl 2-[(3RS)-3-tert-butoxycarbonylamino-2-oxopiperidin-1-yl]acetate as a colourless oil (18.15 g). The mixture was stirred for 16 hours at ambient temperature cooled to 0° C. ice added Volatile material was removed by evaporation the residue was partitioned between ethyl acetate and brine The organic layer was washed with brine dried over Na2SO4 concentrated by evaporation The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (3RS)-3-tert-butoxycarbonylaminopiperidin-2-one (16.07 g) was dissolved in N,N-dimethylformamide (DMF, 350 ml) and the mixture was cooled to 0° C. Sodium hydride (3.6 g of a 50% dispersion in mineral oil) was added and then the mixture was stirred at 0° C. for one hour. A solution of ethyl bromoacetate (13.78 g) in DMF (20 ml) was then added. The mixture was stirred for 16 hours at ambient temperature, then cooled to 0° C. and ice added. Volatile material was removed by evaporation and the residue was partitioned between ethyl acetate and brine. The organic layer was washed with brine, dried over Na2SO4 and concentrated by evaporation. The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.) to give ethyl 2-[(3RS)-3-tert-butoxycarbonylamino-2-oxopiperidin-1-yl]acetate as a colourless oil (18.15 g). The mixture was stirred for 16 hours at ambient temperature cooled to 0° C. ice added Volatile material was removed by evaporation the residue was partitioned between ethyl acetate and brine The organic layer was washed with brine dried over Na2SO4 concentrated by evaporation The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.)

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a solution of tert-butyl(2-oxopiperidin-3-yl)carbamate (1714 mg) in DMF (20 mL) was added 60% sodium hydride (480 mg, containing mineral oil) under ice-cooling. The reaction mixture was stirred at room temperature for 30 min, and iodomethane (1703 mg) was added. The reaction mixture was stirred at room temperature overnight, water was added, and the mixture was extracted with ethyl acetate. The organic layer was separated, washed with water and saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (530 mg). cooling The reaction mixture was stirred at room temperature overnight the mixture was extracted with ethyl acetate The organic layer was separated washed with water and saturated brine dried over magnesium sulfate concentrated under reduced pressure The residue was purified by silica gel column chromatography (ethyl acetate/hexane)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium hydride (82 mg, 2.054 mmol) was added to a solution of tert-butyl 2-oxopiperidin-3-ylcarbamate (200 mg, 0.933 mmol) in dimethylformamide (2 ml) at 23° C. and the resulting mixture was allowed to stir for 30 minutes. The mixture was then cooled to 0° C., and a solution of 2-(bromomethyl)-1-fluoro-3-methoxybenzene (214 mg, 0.977 mmol) in dimethylformamide (1.2 ml) added to the reaction mixture drop-wise. The resulting solution was allowed to stir for 90 minutes and was quenched with methanol. The mixture was then diluted with EtOAc, washed with water and brine, dried with magnesium sulfate, filtered and concentrated to afford tert-butyl 1-(2-fluoro-6-methoxybenzyl)-2-oxopiperidin-3-ylcarbamate. The crude product was progressed to the next step without purification. to stir for 90 minutes was quenched with methanol The mixture was then diluted with EtOAc washed with water and brine dried with magnesium sulfate filtered concentrated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (3RS)-3-tert-butoxycarbonylaminopiperidin-2-one (16.07 g) was dissolved in N,N-dimethylformamide (DMF, 350 ml) and the mixture was cooled to 0° C. Sodium hydride (3.6 g of a 50% dispersion in mineral oil) was added and then the mixture was stirred at 0° C. for one hour. A solution of ethyl bromoacetate (13.78 g) in DMF (20 ml) was then added. The mixture was stirred for 16 hours at ambient temperature, then cooled to 0° C. and ice added. Volatile material was removed by evaporation and the residue was partitioned between ethyl acetate and brine. The organic layer was washed with brine, dried over Na2SO4 and concentrated by evaporation. The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.) to give ethyl 2-[(3RS)-3-tert-butoxycarbonylamino-2-oxopiperidin-1-yl]acetate as a colourless oil (18.15 g). The mixture was stirred for 16 hours at ambient temperature cooled to 0° C. ice added Volatile material was removed by evaporation the residue was partitioned between ethyl acetate and brine The organic layer was washed with brine dried over Na2SO4 concentrated by evaporation The resulting oil was purified on silica eluting with 40% ethyl acetate/petroleum ether (60-80° C.)