2,4-Dimethyl-5-nitroaniline → 5-methyl-6-nitro-1H-indazole

関与物質

反応条件

反応手順

2,4-Dimethyl-5-nitroaniline (1.662 g, 10.00 mmol) was dissolved in glacial acetic acid (100 ml) and the mixture was cooled to 0° C. A solution of sodium nitrite (1 eq, 690 mg) in water (2 ml) was added while maintaining a temperature below 25° C. Stirring was continued for three hours and the mixture was filtered. The filtrate was allowed to stand for three days at room temperature, then was concentrate under reduced pressure. The residue was diluted with water and the resulting mixture was stirred vigorously. The solid product was collected by filtration, washed thoroughly with cold water, and dried. The product was purified by flash chromatography (99:1 dichloromethane/methanol) to give 1.030 g (58.1%) of 5-methyl-6-nitro-1H-indazole as a solid.

情報源と証拠