2-甲基-2H-1,4-苯并恶唑-3(4H)-酮

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: In 56 ml of glacial acetic acid, 6 g of 2-methyl-1,4-benzoxazin-3-(4H)-one is precooled at 0° C. and mixed drop by drop with 1.9 ml of bromine in 19 ml of glacial acetic acid. It is allowed to reach room temperature and stirred for another 8 hours. The mixture is poured onto ice water, the crystals are suctioned off and washed with water. 9.3 g of crude product results, which is recrystallized from ethanol/water. 7-Bromo-2-methyl-1,4-benzoxazin-3-(4H)-one is obtained as a by-product. As an alternative, 4-bromo-2-aminophenol can also be reacted according to the described processes. is precooled at 0° C. to reach room temperature The mixture is poured onto ice water washed with water 9.3 g of crude product results which is recrystallized from ethanol/water

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3,4-Dihydro-2-methyl-3-oxo-1,4(2H)-benzoxazine (11.4 g) and succinic anhydride (7 g) were added to 93 g of aluminum chloride and 15.3 ml of dimethylformamide. The mixture was stirred at 70° C. for 2.5 hours and then poured onto ice, giving a solid which was collected by filtration and washed with water. Drying under vacuum gave 16.5 g of the title compound (90% yield), mp 198°-200° C. poured onto ice giving a solid which was collected by filtration washed with water Drying under vacuum

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: In 56 ml of glacial acetic acid, 6 g of 2-methyl-1,4-benzoxazin-3-(4H)-one is precooled at 0° C. and mixed drop by drop with 1.9 ml of bromine in 19 ml of glacial acetic acid. It is allowed to reach room temperature and stirred for another 8 hours. The mixture is poured onto ice water, the crystals are suctioned off and washed with water. 9.3 g of crude product results, which is recrystallized from ethanol/water. 7-Bromo-2-methyl-1,4-benzoxazin-3-(4H)-one is obtained as a by-product. As an alternative, 4-bromo-2-aminophenol can also be reacted according to the described processes. is precooled at 0° C. to reach room temperature The mixture is poured onto ice water washed with water 9.3 g of crude product results which is recrystallized from ethanol/water