反应详情

Urea (7.5 g., 0.125 mole) is suspended in liquid ammonia (250 ml.) in a round bottom flask fitted with an acetone/dry-ice condenser. Sodium pellets (2.9 g., 0.125 mole) are added and, after they have dissolved, methyl isonicotinate (12 g., 0.089 mole) is added to the mixture. The ammonia is allowed to evaporate from the mixture overnight. The yellow-tan residue is dissolved in water (150 ml.), the pH of the mixture adjusted to 5.5 with glacial acetic acid, and the precipitate which forms filtered, washed with water and air dired. It is then washed with hexane and triturated with boiling methanol. The white solid (isonicotinic acid) is removed by filtration and the filtrate evaporated to dryness to give the title product as a yellowish solid: m.p. 245°-247° C. Quantitative analysis and infra-red data are consistent with the values expected for the product.

1. customfitted with an acetone/dry-ice condenser
2. dissolutionafter they have dissolved
3. customto evaporate from the mixture overnight
4. dissolutionThe yellow-tan residue is dissolved in water (150 ml.)
5. filtrationthe precipitate which forms filtered
6. washwashed with water and air dired
7. washIt is then washed with hexane
8. customtriturated with boiling methanol
9. customThe white solid (isonicotinic acid) is removed by filtration
10. customthe filtrate evaporated to dryness