3-benzylpiperazine-2,5-dione

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid. A sample (2 g) is recrystallized from cyclohexane and then from toluene to provide the purified title compound (0.83 g) as a fine, white crystals: mp 80-81° C. prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L) The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid A sample (2 g) is recrystallized from cyclohexane from toluene to provide the purified title compound (0.83 g) as a fine, white crystals

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5-dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid. A sample (2 g) is recrystallized from cyclohexane and then from toluene to provide the purified title compound (0.83 g) as a fine, white crystals: mp 80–81° C. prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L) The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid A sample (2 g) is recrystallized from cyclohexane from toluene to provide the purified title compound (0.83 g) as a fine, white crystals

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5-dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid. A sample (2 g) is recrystallized from cyclohexane and then from toluene to provide the purified title compound (0.83 g) as a fine, white crystals: mp 80-81° C. prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L) The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid A sample (2 g) is recrystallized from cyclohexane from toluene to provide the purified title compound (0.83 g) as a fine, white crystals

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5-dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L)

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid. A sample (2 g) is recrystallized from cyclohexane and then from toluene to provide the purified title compound (0.83 g) as a fine, white crystals: mp 80-81° C. prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L) The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid A sample (2 g) is recrystallized from cyclohexane from toluene to provide the purified title compound (0.83 g) as a fine, white crystals

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

Procedure: To a suspension of 3-benzyl-piperazine-2,5-dione (14.98 g, 73 mmol, prepared following generally the procedure of Halpern and Westley, J. Org. Chem. 1968, 33, 864) in dry diethyl ether (500 mL) is added dropwise to a solution of lithium aluminum hydride (400 mL of a 1 M solution in diethyl ether, 400 mmol, 5.4 eq). The suspension is heated at reflux for 23 hours and then cooled to 0° C. Water (70 mL) is then cautiously added and the resulting suspension is warmed to room temperature. After 3 hours the suspension is filtered and the solid washed with diethyl ether (1 L). The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid. A sample (2 g) is recrystallized from cyclohexane and then from toluene to provide the purified title compound (0.83 g) as a fine, white crystals: mp 80–81° C. prepared The suspension is heated at reflux for 23 hours the resulting suspension is warmed to room temperature After 3 hours the suspension is filtered the solid washed with diethyl ether (1 L) The filtrate is concentrated under vacuum to provide crude title compound (11.40 g, 88%) as a yellow, crystalline solid A sample (2 g) is recrystallized from cyclohexane from toluene to provide the purified title compound (0.83 g) as a fine, white crystals