反应详情

A mixture of concentrated sulfuric acid (7.5 ml) and concentrated nitric acid (7.5 ml) was added dropwise to a solution of 6-aminonicotinic acid (15 g) in concentrated sulfuric acid (30 ml) under ice-cooling. The reaction mixture was stirred at room temperature for 3 hrs and poured into ice water, and the mixture was stirred for 30 min. The precipitated crystals were collected by filtration and washed with water. The obtained crystals were suspended in concentrated sulfuric acid (60 ml), and the mixture was stirred at 100° C. for 2 hr. The reaction mixture was adjusted with sodium hydroxide to pH 4, and the precipitated crystals were collected by filtration to give the title compound (7.26 g, yield 36%) as pale-as yellow crystals. purity 94%. M+H: 184.

1. temperaturecooling
2. stirringthe mixture was stirred for 30 min
3. filtrationThe precipitated crystals were collected by filtration
4. washwashed with water
5. stirringthe mixture was stirred at 100° C. for 2 hr
6. filtrationthe precipitated crystals were collected by filtration