1-(4-bromophenyl)-3-cyclopropylurea

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

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

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 g) obtained in Step 1 was added acetic anhydride (25.8 ml), malonic acid 4 (5.79 g) was added under a nitrogen atmosphere, and the mixture was stirred at 100° C. for 3 hrs. After allowing to cool to room temperature, the reaction mixture was concentrated under reduced pressure. Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-pyrimidine-2,4,6-trione 32 (11.9 g, yield 73%) as pale-yellow crystals. was added under a nitrogen atmosphere to cool to room temperature the reaction mixture was concentrated under reduced pressure Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 g) obtained in Step 1 was added acetic anhydride (25.8 ml), malonic acid 4 (5.79 g) was added under a nitrogen atmosphere, and the mixture was stirred at 100° C. for 3 hrs. After allowing to cool to room temperature, the reaction mixture was concentrated under reduced pressure. Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-pyrimidine-2,4,6-trione 32 (11.9 g, yield 73%) as pale-yellow crystals. was added under a nitrogen atmosphere to cool to room temperature the reaction mixture was concentrated under reduced pressure Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried

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

Procedure: Under a nitrogen atmosphere, tetrahydrofuran (80 ml) was added to 4-bromophenyl isocyanate 30 (10.0 g), and a solution of cyclopropylamine 1 (3.17 g) in tetrahydrofuran (20 ml) was added dropwise with stirring under ice-cooling. After the completion of the dropwise addition, the mixture was stirred at room temperature for 3 hrs, and the reaction mixture was concentrated under reduced pressure. Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 g, over weight) as colorless crystals, which were used for the next step without purification. cooling After the completion of the dropwise addition the mixture was stirred at room temperature for 3 hrs the reaction mixture was concentrated under reduced pressure Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried

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

Procedure: Under a nitrogen atmosphere, tetrahydrofuran (80 ml) was added to 4-bromophenyl isocyanate 30 (10.0 g), and a solution of cyclopropylamine 1 (3.17 g) in tetrahydrofuran (20 ml) was added dropwise with stirring under ice-cooling. After the completion of the dropwise addition, the mixture was stirred at room temperature for 3 hrs, and the reaction mixture was concentrated under reduced pressure. Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 g, over weight) as colorless crystals, which were used for the next step without purification. cooling After the completion of the dropwise addition the mixture was stirred at room temperature for 3 hrs the reaction mixture was concentrated under reduced pressure Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 g) obtained in Step 1 was added acetic anhydride (25.8 ml), malonic acid 4 (5.79 g) was added under a nitrogen atmosphere, and the mixture was stirred at 100° C. for 3 hrs. After allowing to cool to room temperature, the reaction mixture was concentrated under reduced pressure. Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-pyrimidine-2,4,6-trione 32 (11.9 g, yield 73%) as pale-yellow crystals. was added under a nitrogen atmosphere to cool to room temperature the reaction mixture was concentrated under reduced pressure Diethyl ether-ethanol [4:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried

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

Procedure: Under a nitrogen atmosphere, tetrahydrofuran (80 ml) was added to 4-bromophenyl isocyanate 30 (10.0 g), and a solution of cyclopropylamine 1 (3.17 g) in tetrahydrofuran (20 ml) was added dropwise with stirring under ice-cooling. After the completion of the dropwise addition, the mixture was stirred at room temperature for 3 hrs, and the reaction mixture was concentrated under reduced pressure. Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue and, after stirring, the crystals were collected by filtration and dried to give 1-(4-bromo-phenyl)-3-cyclopropyl-urea 31 (12.9 ġ, over weight) as colorless crystals, which were used for the next step without purification. cooling After the completion of the dropwise addition the mixture was stirred at room temperature for 3 hrs the reaction mixture was concentrated under reduced pressure Diethyl ether-hexane [1:1 (volume ratio), 100 ml] was added to the residue after stirring the crystals were collected by filtration dried