1-methylsulfonylpiperidin-4-one

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: Potassium carbonate (324 g, 2340 mmol) was added to a solution of 4-piperidone monohydrate hydrochloride (90 g, 586 mmol) in chloroform (300 mL) and water (300 mL). The slurry was cooled to 0° C. and treated with methylsulfonyl chloride (136 mL, 1760 mmol) by dropwise addition over a 1 h period (gas evolution was observed). The reaction mixture was allowed to shake for 72 h and was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL). The aqueous layer was extracted with CH2Cl2 (3 ×200 mL). The organic layer was washed with 1% KHSO4 (250 mL), dried (Na2SO4), and concentrated to afford 90.5 g (87%) of a white solid. MS (electrospray): exact mass calculated for C6H11NO3S, 177.1; m/z found, 178.1 [M+H]+. HPLC (reverse phase conditions): tR=2.19 min. 1H NMR (400 MHz, CDCl3): 3.60 (t, J=6.5 Hz, 4H), 2.89 (s, 3H), 2.59 (t, J=6.3 Hz, 4H). was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL) The aqueous layer was extracted with CH2Cl2 (3 ×200 mL) The organic layer was washed with 1% KHSO4 (250 mL) dried (Na2SO4) concentrated

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

Procedure: Potassium carbonate (324 g, 2340 mmol) was added to a solution of 4-piperidone monohydrate hydrochloride (90 g, 586 mmol) in chloroform (300 mL) and water (300 mL). The slurry was cooled to 0° C. and treated with methylsulfonyl chloride (136 mL, 1760 mmol) by dropwise addition over a 1 h period (gas evolution was observed). The reaction mixture was allowed to shake for 72 h and was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL). The aqueous layer was extracted with CH2Cl2 (3 ×200 mL). The organic layer was washed with 1% KHSO4 (250 mL), dried (Na2SO4), and concentrated to afford 90.5 g (87%) of a white solid. MS (electrospray): exact mass calculated for C6H11NO3S, 177.1; m/z found, 178.1 [M+H]+. HPLC (reverse phase conditions): tR=2.19 min. 1H NMR (400 MHz, CDCl3): 3.60 (t, J=6.5 Hz, 4H), 2.89 (s, 3H), 2.59 (t, J=6.3 Hz, 4H). was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL) The aqueous layer was extracted with CH2Cl2 (3 ×200 mL) The organic layer was washed with 1% KHSO4 (250 mL) dried (Na2SO4) concentrated

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 4-piperidone monohydrate hydrochloride (2.0 g, 13 mmol) and K2CO3 (9.0 g, 65.2 mmol) in acetone (40 ml) was added methanesulfonyl chloride (5.96 g, 52.1 mmol) at 0-5° C. The mixture was stirred at 25° C. for 24 h. The solid material was removed by filtration, and the filtrate was concentrated to dryness. The residue was purified by flash chromatography (silica gel, 80% ether in hexanes) to afford the desired ketone (1.20 g, 52%) as a colorless solid. mp 102-104° C.; 1H NMR (500 MHz, CDCl3) δ2.58 (t, J=6.4 Hz, 4H), 2.90 (s, 3H), 3.60 (t, J=6.4 Hz, 4H). The solid material was removed by filtration the filtrate was concentrated to dryness The residue was purified by flash chromatography (silica gel, 80% ether in hexanes)

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

Procedure: A solution of 4-isobutylsulfamoyl-benzyl-phosphonium bromide (1.87 g, 3.29 mmol) in DMF (10 mL) was treated with NaH (60% dispersion in mineral oil, 329 mg, 8.22 mmol) and stirred at room temperature for 1 hour. 1-(Methylsulfonyl)piperidin-4-one (758 mg, 4.28 mmol) was added and the mixture stirred at room temperature for 18 hours. The mixture was diluted with EtOAc, washed with water and brine, dried over Na2SO4 and concentrated under vacuum. Purification by silica gel column chromatography (0-100% EtOAc in cyclohexane) gave N-isobutyl-4-(1-methanesulfonyl-piperidin-4-ylidenemethyl)-benzenesulfonamide (392 mg, 31%). 1H NMR (300 MHz, CDCl3) δ 7.81 (d, J=8.2 Hz, 2H), 7.31 (d, J=8.2 Hz, 2H), 6.43 (s, 1H), 4.40 (t, J=6.5 Hz, 1H), 3.37 (t, J=5.7 Hz, 2H), 3.25 (t, J=5.8 Hz, 2H), 2.82-2.76 (m, 5H), 2.60 (t, J=5.7 Hz, 2H), 2.53 (t, J=5.7 Hz, 2H), 1.80-1.66 (m, 1H), 0.88 (d, J=6.7 Hz, 6H). LCMS (m/z, Method A) ES+ 523.1 [M+Na]+. the mixture stirred at room temperature for 18 hours washed with water and brine dried over Na2SO4 concentrated under vacuum Purification by silica gel column chromatography (0-100% EtOAc in cyclohexane)

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 4-piperidone monohydrate hydrochloride (2.0 g, 13 mmol) and K2CO3 (9.0 g, 65.2 mmol) in acetone (40 ml) was added methanesulfonyl chloride (5.96 g, 52.1 mmol) at 0-5° C. The mixture was stirred at 25° C. for 24 h. The solid material was removed by filtration, and the filtrate was concentrated to dryness. The residue was purified by flash chromatography (silica gel, 80% ether in hexanes) to afford the desired ketone (1.20 g, 52%) as a colorless solid. mp 102-104° C.; 1H NMR (500 MHz, CDCl3) δ2.58 (t, J=6.4 Hz, 4H), 2.90 (s, 3H), 3.60 (t, J=6.4 Hz, 4H). The solid material was removed by filtration the filtrate was concentrated to dryness The residue was purified by flash chromatography (silica gel, 80% ether in hexanes)

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 4-piperidone monohydrate hydrochloride (2.0 g, 13 mmol) and K2CO3 (9.0 g, 65.2 mmol) in acetone (40 ml) was added methanesulfonyl chloride (5.96 g, 52.1 mmol) at 0-5° C. The mixture was stirred at 25° C. for 24 h. The solid material was removed by filtration, and the filtrate was concentrated to dryness. The residue was purified by flash chromatography (silica gel, 80% ether in hexanes) to afford the desired ketone (1.20 g, 52%) as a colorless solid. mp 102-104° C.; 1H NMR (500 MHz, CDCl3) δ2.58 (t, J=6.4 Hz, 4H), 2.90 (s, 3H), 3.60 (t, J=6.4 Hz, 4H). The solid material was removed by filtration the filtrate was concentrated to dryness The residue was purified by flash chromatography (silica gel, 80% ether in hexanes)

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

Procedure: Potassium carbonate (324 g, 2340 mmol) was added to a solution of 4-piperidone monohydrate hydrochloride (90 g, 586 mmol) in chloroform (300 mL) and water (300 mL). The slurry was cooled to 0° C. and treated with methylsulfonyl chloride (136 mL, 1760 mmol) by dropwise addition over a 1 h period (gas evolution was observed). The reaction mixture was allowed to shake for 72 h and was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL). The aqueous layer was extracted with CH2Cl2 (3×200 mL). The organic layer was washed with 1% KHSO4 (250 mL), dried (Na2SO4), and concentrated to afford 90.5 g (87%) of a white solid. MS (electrospray): exact mass calculated for C6H11NO3S, 177.1; m/z found, 178.1 [M+H]+. HPLC (reverse phase conditions): tR=2.19 min. 1H NMR (400 MHz, CDCl3): 3.60 (t, J=6.5 Hz, 4H), 2.89 (s, 3H), 2.59 (t, J=6.3 Hz, 4H). was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL) The aqueous layer was extracted with CH2Cl2 (3×200 mL) The organic layer was washed with 1% KHSO4 (250 mL) dried (Na2SO4) concentrated

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

Procedure: Potassium carbonate (324 g, 2340 mmol) was added to a solution of 4-piperidone monohydrate hydrochloride (90 g, 586 mmol) in chloroform (300 mL) and water (:300 mL). The slurry was cooled to 0° C. and treated with methylsulfonyl chloride (136 mL, 1760 mmol) by dropwise addition over a 1 h period (gas evolution was observed). The reaction mixture was allowed to shake for 72 h and was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL). The aqueous layer was extracted with CH2Cl2 (3×200 mL). The organic layer was washed with 1% KHSO4 (250 mL), dried (Na2SO4), and concentrated to afford 90.5 g (87%) of a white solid. MS (electrospray): exact mass calculated for C6H11NO3S, 177.1; m/z found, 178.1 [M+H]+. HPLC (reverse phase conditions): tR=2.19 min. 1H NMR (400 MHz, CDCl3): 3.60 (t, J=6.5 Hz, 4H), 2.89 (s, 3H), 2.59 (t, J=6.3 Hz, 4H). was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL) The aqueous layer was extracted with CH2Cl2 (3×200 mL) The organic layer was washed with 1% KHSO4 (250 mL) dried (Na2SO4) concentrated

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

Procedure: Potassium carbonate (324 g, 2340 mmol) was added to a solution of 4-piperidone monohydrate hydrochloride (90 g, 586 mmol) in chloroform (300 mL) and water (:300 mL). The slurry was cooled to 0° C. and treated with methylsulfonyl chloride (136 mL, 1760 mmol) by dropwise addition over a 1 h period (gas evolution was observed). The reaction mixture was allowed to shake for 72 h and was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL). The aqueous layer was extracted with CH2Cl2 (3×200 mL). The organic layer was washed with 1% KHSO4 (250 mL), dried (Na2SO4), and concentrated to afford 90.5 g (87%) of a white solid. MS (electrospray): exact mass calculated for C6H11NO3S, 177.1; m/z found, 178.1 [M+H]+. HPLC (reverse phase conditions): tR=2.19 min. 1H NMR (400 MHz, CDCl3): 3.60 (t, J=6.5 Hz, 4H), 2.89 (s, 3H), 2.59 (t, J=6.3 Hz, 4H). was partitioned between CH2Cl2 (500 mL) and saturated aqueous NaHCO3 (500 mL) The aqueous layer was extracted with CH2Cl2 (3×200 mL) The organic layer was washed with 1% KHSO4 (250 mL) dried (Na2SO4) concentrated

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

Procedure: 1-Methylsuylfonyl-4-piperidone (40.00 g, 0.226 mol), CH3CN (240 ml) and 40% CH3NH2 (20.4 ml, 0.263 mol) were added to a round bottom flask, and the mixture was stirred at room temperature for 1 hour. To another round bottom flask, NaBH(OAc)3 (60.00 g, 0.283 mol) and 120 ml of CH3CN were added. This solution was stirred at −10° C., to which the first mixture (derived from 1-methylsulfonyl-4-piperidone) was added slowly via an additional funnel. After the addition, the reaction was allowed to warm to room temperature and stirred overnight. The reaction mixture was concentarted to a small volume, to which 1N aq. NaOH (282 ml) was added. This resulting solution was extracted with CH2Cl2 (3×500 ml) followed by extraction with toluene until no product remained in the extraction solution. The combined organic layers were dried over Na2SO4. After filtration, the solution was concentrated in vacuo to give the product (29.0 g, 63%). 1H NMR (CDCl3) δ 3.66 (m, 2H), 2.84 (m, 2H), 2.76 (s, 3H), 2.52 (m, 1H), 2.42 (s, 3H), 1.96 (m, 2H), 1.45 (m, 2H). MS m/e 193 (M+H)+. was added slowly via an additional funnel After the addition to warm to room temperature stirred overnight was added This resulting solution was extracted with CH2Cl2 (3×500 ml) followed by extraction with toluene until no product The combined organic layers were dried over Na2SO4 After filtration the solution was concentrated in vacuo