8-benzyl-2,8-diazaspiro[4.5]decane-1,3-dione

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

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

Procedure: To 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (28.3 g, 0.11 mol) and Pd(OH)2 (8.5 g) in 2 l of flask, EtOH (438 ml) and acetic acid (5.5 ml) are added at ambient temperature. The reaction mixture is stirred under H2 at room temperature for 15 h. The catalysts are removed by filtration and EtOH is evaporated down to give 2,8-diaza-spiro[4.5]decane-1,3-dione in quantitative yield. To a suspension of 2,8-diaza-spiro[4.5]decane-1,3-dione (4.2 g, 25.2 mmol) in dichloromethane (60 ml), 1N NaOH (26 ml, 26 mmol) and di-t-butyldicarbonate (6.1 g, 27.7 mmol) in dichloromethane (20 ml) are added at ambient temperature. The reaction mixture is stirred for 15 h. 10% Citric acid is added to the reaction mixture and the pH of the mixture is adjusted to 5. The combined extracts are washed with brine, dried over magnesium sulfate and concentrated under vacuum to give solid product, which filtrated with diethyl ether. The catalysts are removed by filtration and EtOH is evaporated down

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

Procedure: Acetic acid (56.8 ml) and sulfuric acid (11.8 ml) are added to 1-benzyl-4-cyanomethyl-piperidine-4-carbonitrile (27.2 g, 0.114 mmol) at ambient temperature. The reaction mixture is stirred at 125 C.° for 1 h, cooled down to the room temperature and added to saturated NaOH aq. to adjust to pH 6.0. The mixture is extracted with dichloromethane. The combined extracts are washed with H2O and brine, dried over sodium sulfate and evaporated down to give 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (three steps yield: 81.8%). The mixture is extracted with dichloromethane The combined extracts are washed with H2O and brine dried over sodium sulfate evaporated down

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

Procedure: Acetic acid (56.8 ml) and sulfuric acid (11.8 ml) are added to 1-benzyl-4-cyanomethyl-piperidine-4-carbonitrile (27.2 g, 0.114 mmol) at ambient temperature. The reaction mixture is stirred at 125 C.° for 1 h, cooled down to the room temperature and added to saturated NaOH aq. to adjust to pH 6.0. The mixture is extracted with dichloromethane. The combined extracts are washed with H2O and brine, dried over sodium sulfate and evaporated down to give 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (three steps yield: 81.8%). The mixture is extracted with dichloromethane The combined extracts are washed with H2O and brine dried over sodium sulfate evaporated down

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

Procedure: To 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (28.3 g, 0.11 mol) and Pd(OH)2 (8.5 g) in 2 l of flask, EtOH (438 ml) and acetic acid (5.5 ml) are added at ambient temperature. The reaction mixture is stirred under H2 at room temperature for 15 h. The catalysts are removed by filtration and EtOH is evaporated down to give 2,8-diaza-spiro[4.5]decane-1,3-dione in quantitative yield. To a suspension of 2,8-diaza-spiro[4.5]decane-1,3-dione (4.2 g, 25.2 mmol) in dichloromethane (60 ml), 1N NaOH (26 ml, 26 mmol) and di-t-butyldicarbonate (6.1 g, 27.7 mmol) in dichloromethane (20 ml) are added at ambient temperature. The reaction mixture is stirred for 15 h. 10% Citric acid is added to the reaction mixture and the pH of the mixture is adjusted to 5. The combined extracts are washed with brine, dried over magnesium sulfate and concentrated under vacuum to give solid product, which filtrated with diethyl ether. The catalysts are removed by filtration and EtOH is evaporated down

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

Procedure: To 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (28.3 g, 0.11 mol) and Pd(OH)2 (8.5 g) in 2 l of flask, EtOH (438 ml) and acetic acid (5.5 ml) are added at ambient temperature. The reaction mixture is stirred under H2 at room temperature for 15 h. The catalysts are removed by filtration and EtOH is evaporated down to give 2,8-diaza-spiro[4.5]decane-1,3-dione in quantitative yield. To a suspension of 2,8-diaza-spiro[4.5]decane-1,3-dione (4.2 g, 25.2 mmol) in dichloromethane (60 ml), 1N NaOH (26 ml, 26 mmol) and di-t-butyldicarbonate (6.1 g, 27.7 mmol) in dichloromethane (20 ml) are added at ambient temperature. The reaction mixture is stirred for 15 h. 10% Citric acid is added to the reaction mixture and the pH of the mixture is adjusted to 5. The combined extracts are washed with brine, dried over magnesium sulfate and concentrated under vacuum to give solid product, which filtrated with diethyl ether. The catalysts are removed by filtration and EtOH is evaporated down

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

Procedure: Acetic acid (56.8 ml) and sulfuric acid (11.8 ml) are added to 1-benzyl-4-cyanomethyl-piperidine-4-carbonitrile (27.2 g, 0.114 mmol) at ambient temperature. The reaction mixture is stirred at 125 C.° for 1 h, cooled down to the room temperature and added to saturated NaOH aq. to adjust to pH 6.0. The mixture is extracted with dichloromethane. The combined extracts are washed with H2O and brine, dried over sodium sulfate and evaporated down to give 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (three steps yield: 81.8%). The mixture is extracted with dichloromethane The combined extracts are washed with H2O and brine dried over sodium sulfate evaporated down

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

Procedure: To 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (28.3 g, 0.11 mol) and Pd(OH)2 (8.5 g) in 2 l of flask, EtOH (438 ml) and acetic acid (5.5 ml) are added at ambient temperature. The reaction mixture is stirred under H2 at room temperature for 15 h. The catalysts are removed by filtration and EtOH is evaporated down to give 2,8-diaza-spiro[4.5]decane-1,3-dione in quantitative yield. To a suspension of 2,8-diaza-spiro[4.5]decane-1,3-dione (4.2 g, 25.2 mmol) in dichloromethane (60 ml), 1N NaOH (26 ml, 26 mmol) and di-t-butyldicarbonate (6.1 g, 27.7 mmol) in dichloromethane (20 ml) are added at ambient temperature. The reaction mixture is stirred for 15 h. 10% Citric acid is added to the reaction mixture and the pH of the mixture is adjusted to 5. The combined extracts are washed with brine, dried over magnesium sulfate and concentrated under vacuum to give solid product, which filtrated with diethyl ether. The catalysts are removed by filtration and EtOH is evaporated down

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

Procedure: Acetic acid (56.8 ml) and sulfuric acid (11.8 ml) are added to 1-benzyl-4-cyanomethyl-piperidine-4-carbonitrile (27.2 g, 0.114 mmol) at ambient temperature. The reaction mixture is stirred at 125 C.° for 1 h, cooled down to the room temperature and added to saturated NaOH aq. to adjust to pH 6.0. The mixture is extracted with dichloromethane. The combined extracts are washed with H2O and brine, dried over sodium sulfate and evaporated down to give 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (three steps yield: 81.8%). The mixture is extracted with dichloromethane The combined extracts are washed with H2O and brine dried over sodium sulfate evaporated down

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

Procedure: To 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (28.3 g, 0.11 mol) and Pd(OH)2 (8.5 g) in 2 l of flask, EtOH (438 ml) and acetic acid (5.5 ml) are added at ambient temperature. The reaction mixture is stirred under H2 at room temperature for 15 h. The catalysts are removed by filtration and EtOH is evaporated down to give 2,8-diaza-spiro[4.5]decane-1,3-dione in quantitative yield. To a suspension of 2,8-diaza-spiro[4.5]decane-1,3-dione (4.2 g, 25.2 mmol) in dichloromethane (60 ml), 1N NaOH (26 ml, 26 mmol) and di-t-butyldicarbonate (6.1 g, 27.7 mmol) in dichloromethane (20 ml) are added at ambient temperature. The reaction mixture is stirred for 15 h. 10% Citric acid is added to the reaction mixture and the pH of the mixture is adjusted to 5. The combined extracts are washed with brine, dried over magnesium sulfate and concentrated under vacuum to give solid product, which filtrated with diethyl ether. The catalysts are removed by filtration and EtOH is evaporated down

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

Procedure: Acetic acid (56.8 ml) and sulfuric acid (11.8 ml) are added to 1-benzyl-4-cyanomethyl-piperidine-4-carbonitrile (27.2 g, 0.114 mmol) at ambient temperature. The reaction mixture is stirred at 125 C.° for 1 h, cooled down to the room temperature and added to saturated NaOH aq. to adjust to pH 6.0. The mixture is extracted with dichloromethane. The combined extracts are washed with H2O and brine, dried over sodium sulfate and evaporated down to give 8-benzyl-2,8-diaza-spiro[4.5]decane-1,3-dione (three steps yield: 81.8%). The mixture is extracted with dichloromethane The combined extracts are washed with H2O and brine dried over sodium sulfate evaporated down