benzyl N-(piperidin-4-ylmethyl)carbamate

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 benzyl piperidin-4-ylmethylcarbamate (Tetrahedron Lett. 1990, 31, 6903, 6.9 g, 27.8 mmol) in N,N-dimethylformamide (60 mL) were added triethylamine (9.7 mL, 69.5 mmol) and 1-bromo-3,3-dimethylbutan-2-one (7.9 g, 41.7 mmol) at room temperature. The mixture was stirred at room temperature for 2 h and quenched with water (60 mL) followed by extraction with ethyl acetate-toluene mixture (3×30 mL). Concentration and purification by column chromatography on silica gel eluting with ethyl acetate/hexane (2:1) gave the title compound (9.6 g, 100%) as a pale yellow solid. quenched with water (60 mL) followed by extraction with ethyl acetate-toluene mixture (3×30 mL) Concentration and purification by column chromatography on silica gel eluting with ethyl acetate/hexane (2:1)

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

Procedure: A mixture of benzyl(piperidin-4-ylmethyl)carbamate (7.77 g, 31.3 mmol, prepared according to Bose, D. Subhas et al., Tetrahedron Lett., 1990, 31, 6903) and 1,6-dioxaspiro[2.5]octane (4.29 g, 37.6 mmol, prepared according to Satyamurthy, Nagichettiar et al., Phosphorus Sulfur, 1984, 19, 113) in methanol (93 mL) was stirred at room temperature for 20 h. Then, the mixture was refluxed for 8 h. After cooling to room temperature, the solvent was removed in vacuo. The residue was chromatographed on a column of silica gel eluting with dichloromethane/methanol (v/v=20/1) to give 5.60 g (49%) of the title compound as colorless oil. Then, the mixture was refluxed for 8 h After cooling to room temperature the solvent was removed in vacuo The residue was chromatographed on a column of silica gel eluting with dichloromethane/methanol (v/v=20/1)

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

Procedure: A mixture of benzyl(piperidin-4-ylmethyl)carbamate (7.77 g, 31.3 mmol, prepared according to Bose, D. Subhas et al., Tetrahedron Lett., 1990, 31, 6903) and 1,6-dioxaspiro[2.5]octane (4.29 g, 37.6 mmol, prepared according to Satyamurthy, Nagichettiar et al., Phosphorus Sulfur, 1984, 19, 113) in methanol (93 mL) was stirred at room temperature for 20 h. Then, the mixture was refluxed for 8 h. After cooling to room temperature, the solvent was removed in vacuo. The residue was chromatographed on a column of silica gel eluting with dichloromethane/methanol (v/v=20/1) to give 5.60 g (49%) of the title compound as colorless oil. Then, the mixture was refluxed for 8 h After cooling to room temperature the solvent was removed in vacuo The residue was chromatographed on a column of silica gel eluting with dichloromethane/methanol (v/v=20/1)

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

Procedure: A mixture of benzyl(piperidin-4-ylmethyl)carbamate (7.77 g, 31.3 mmol, Bose, D. Subhas et al., Tetrahedron Lett., 1990, 31, 6903) and 1,6-dioxaspiro[2.5]octane (4.29 g, 37.6 mmol, Satyamurthy, Nagichettiar et al., Phosphorus Sulfur, 1984, 19, 113) in methanol (93 mL) was stirred at room temperature for 20 h. Then the mixture was refluxed for 8 h. After cooling to room temperature, the solvent was removed in vacuo. The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20) to give 5.60 g (49%) of the title compound as a colorless oil. Then the mixture was refluxed for 8 h After cooling to room temperature the solvent was removed in vacuo The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20)

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

Procedure: A mixture of benzyl(piperidin-4-ylmethyl)carbamate (7.77 g, 31.3 mmol, Bose, D. Subhas et al., Tetrahedron Lett., 1990, 31, 6903) and 1,6-dioxaspiro[2.5]octane (4.29 g, 37.6 mmol, Satyamurthy, Nagichettiar et al., Phosphorus Sulfur, 1984, 19, 113) in methanol (93 mL) was stirred at room temperature for 20 h. Then the mixture was refluxed for 8 h. After cooling to room temperature, the solvent was removed in vacuo. The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20) to give 5.60 g (49%) of the title compound as a colorless oil. Then the mixture was refluxed for 8 h After cooling to room temperature the solvent was removed in vacuo The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20)

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 3 (4.4 g, 13 mmol) in 90 ml of methylene chloride was added 45 ml of TFA. After stirring at room temperature for 24 hours, the solvents were removed in vacuo and the residue partitioned between chloroform and 10% Na2CO3. The organics were dried over MgSO4, filtered, and the solvent removed in vacuo to give the title compound. the solvents were removed in vacuo the residue partitioned between chloroform and 10% Na2CO3 The organics were dried over MgSO4 filtered the solvent removed in vacuo

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

Procedure: A mixture of benzyl(piperidin-4-ylmethyl)carbamate (7.77 g, 31.3 mmol, Bose, D. Subhas et al., Tetrahedron Lett., 1990, 31, 6903) and 1,6-dioxaspiro[2.5]octane (4.29 g, 37.6 mmol, Satyamurthy, Nagichettiar et al., Phosphorus Sulfur, 1984, 19, 113) in methanol (93 mL) was stirred at room temperature for 20 h. Then the mixture was refluxed for 8 h. After cooling to room temperature, the solvent was removed in vacuo. The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20) to give 5.60 g (49%) of the title compound as a colorless oil. Then the mixture was refluxed for 8 h After cooling to room temperature the solvent was removed in vacuo The residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:20)

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

Procedure: To a solution of 2-(4-oxo-piperidin-1-yl)-benzonitrile (5) (653 mg, 3.26 mmol) and 4 (890 mg, 3.58 mmol) in 40 ml of methanol was added 4 g of powdered 4 Å molecular sieves. The resulting suspension was stirred at room temperature for 24 hours. The suspension was subsequently acidified to pH 5 with acetic acid and a 1M solution of NaCNBH3 in THF (6.0 ml 5.6 mmol) was added slowly with a syringe pump over 24 hours. When the addition was complete, the solvent was removed in vacuo and the residue taken up in chloroform and filtered. The solution was then washed with 10% Na2CO3, dried over MgSO4, and the solvent removed in vacuo to give the crude amine. The crude product was purified by chromatography on silica gel (5% MeOH/CHCl3) to give the title compound. When the addition the solvent was removed in vacuo filtered The solution was then washed with 10% Na2CO3 dried over MgSO4 the solvent removed in vacuo to give the crude amine The crude product was purified by chromatography on silica gel (5% MeOH/CHCl3)