N-(dimethylcarbamoyl)-N-methylcarbamoyl chloride

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

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: Into 600 ml of tetrahydrofuran, were dissolved 41 g of 1-formylpiperazine and 54.5 g of triethylamine. To the solution, while being stirred and cooled in ice, was added dropwise 56 g of 2,4,4-trimethylallophanyl chloride. The mixture was allowed to react at room temperature for 6 hours and the precipitate was removed by filtration. The filtrate was concentrated and the residue was recrystallized from tetrahydrofuran to obtain 41 g of 1-formyl-4-(2,4,4-trimethylallophanoyl)piperazine. This compound was mixed with 800 ml of 6N hydrochloric acid and the mixture was heated with stirring at 60° C. for one hour. The reaction mixture was concentrated and the residue was recrystallized from ethanol to obtain 35.2 g of 1-(2,4,4-trimethylallophanoyl)piperazine hydrochloride having a melting point of 215° C. cooled in ice to react at room temperature for 6 hours the precipitate was removed by filtration The filtrate was concentrated the residue was recrystallized from tetrahydrofuran

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

Procedure: Into 600 ml of tetrahydrofuran, were dissolved 41 g of 1-formylpiperazine and 54.5 g of triethylamine. To the solution, while being stirred and cooled in ice, was added dropwise 56 g of 2,4,4-trimethylallophanyl chloride. The mixture was allowed to react at room temperature for 6 hours and the precipitate was removed by filtration. The filtrate was concentrated and the residue was recrystallized from tetrahydrofuran to obtain 41 g of 1-formyl-4-(2,4,4-trimethylallophanoyl)piperazine. This compound was mixed with 800 ml of 6N hydrochloric acid and the mixture was heated with stirring at 60° C. for one hour. The reaction mixture was concentrated and the residue was recrystallized from ethanol to obtain 35.2 g of 1-(2,4,4-trimethylallophanoyl)piperazine hydrochloride having a melting point of 215° C. cooled in ice to react at room temperature for 6 hours the precipitate was removed by filtration The filtrate was concentrated the residue was recrystallized from tetrahydrofuran

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

Procedure: Into 80 ml of dichloromethane, were dissolved 10.8 g of 1-(p-fluorophenyl)piperazine and 6.1 g of triethylamine. To the solution, while being stirred and cooled in ice, was added dropwise 10.0 g of 2,4,4-trimethylallophanoyl chloride. After one hour of reaction at room temperature, the reaction mixture was washed with water and dried over anhydrous sodium sulfate. The solvent was removed by distillation and the residue was recrystallized from a mixture of ethanol and ether to obtain 13.7 g (74% yield) of 1-(p-fluorophenyl)-4-(2,4,4-trimethylallophanoyl)piperazine having a melting point of 83°-84° C. cooled in ice After one hour of reaction at room temperature the reaction mixture was washed with water dried over anhydrous sodium sulfate The solvent was removed by distillation the residue was recrystallized from a mixture of ethanol and ether

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

Procedure: Into 80 ml of dichloromethane, were dissolved 10.8 g of 1-(p-fluorophenyl)piperazine and 6.1 g of triethylamine. To the solution, while being stirred and cooled in ice, was added dropwise 10.0 g of 2,4,4-trimethylallophanoyl chloride. After one hour of reaction at room temperature, the reaction mixture was washed with water and dried over anhydrous sodium sulfate. The solvent was removed by distillation and the residue was recrystallized from a mixture of ethanol and ether to obtain 13.7 g (74% yield) of 1-(p-fluorophenyl)-4-(2,4,4-trimethylallophanoyl)piperazine having a melting point of 83°-84° C. cooled in ice After one hour of reaction at room temperature the reaction mixture was washed with water dried over anhydrous sodium sulfate The solvent was removed by distillation the residue was recrystallized from a mixture of ethanol and ether

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

Procedure: Into 50 ml of anhydrous tetrahydrofuran, 7.4 g (0.08 mol) of aniline was added thereinto and dissolved and the mixture was cooled below 0° C. under stirring. Into this cooled mixture, a solution obtained by dissolving 6.4 g (0.04 mol) of 2,4,4-trimethylallophanoyl chloride in 10 ml of anhydrous tetrahydrofuran was added drop-wise under stirring. After the reaction was continued for 1 hour at room temperature, the solvent was remvoed by distillation under reduced pressure. To the residue thus obtained, water was added and insoluble material was separated by filtration and was recrystallized from ethanol to obtain 13.0 g (yield: 73%) of 1,1,3-trimethyl-5-phenylbiuret having a melting point of 89.5°-90.5° C. dissolved the mixture was cooled below 0° C. Into this cooled mixture, a solution obtained was added drop-wise under stirring the solvent was remvoed by distillation under reduced pressure To the residue thus obtained insoluble material was separated by filtration was recrystallized from ethanol

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

Procedure: Into 50 ml of anhydrous tetrahydrofuran, 7.4 g (0.08 mol) of aniline was added thereinto and dissolved and the mixture was cooled below 0° C. under stirring. Into this cooled mixture, a solution obtained by dissolving 6.4 g (0.04 mol) of 2,4,4-trimethylallophanoyl chloride in 10 ml of anhydrous tetrahydrofuran was added drop-wise under stirring. After the reaction was continued for 1 hour at room temperature, the solvent was remvoed by distillation under reduced pressure. To the residue thus obtained, water was added and insoluble material was separated by filtration and was recrystallized from ethanol to obtain 13.0 g (yield: 73%) of 1,1,3-trimethyl-5-phenylbiuret having a melting point of 89.5°-90.5° C. dissolved the mixture was cooled below 0° C. Into this cooled mixture, a solution obtained was added drop-wise under stirring the solvent was remvoed by distillation under reduced pressure To the residue thus obtained insoluble material was separated by filtration was recrystallized from ethanol

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

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

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