反应详情

温度

130 °C

2-Amino-6-bromopyridine (25.0 g) was added to a mixture of ethyl acrylate (17.39 g) (1.2 eq) and acetic acid (4.55 g, 0.52 eq). The reaction mixture was heated at 130° C. for 70 hours and then cooled to room temperature. An aqueous NaOH solution (6N, 60 mL, 2.50 eq) was added and the resulting mixture was heated at reflux for one (1) hour and then cooled to room temperature. The solution was washed twice with ether and then acidified to pH 4-5 with concentrated HCl. The precipitate was collected by filtration to give the title compound as a tan solid (68% yield). M.p. 108-109° C., LCMS: m/z=245.06 (M+H+), 1H-NMR (DMSO-d6, 400 MHz) δ 3.33-3.40 (m, 4H), 6.46 (d, J=8.2 Hz, 1H), 6.63 (d, J=7.3 Hz, 1H), 7.02 (t, J=5.4 Hz, 1H), 7.27 (dd, J=8.2 and 7.3 Hz, 1H), 12.22 (bs, 1H).

1. temperaturecooled to room temperature
2. temperaturethe resulting mixture was heated
3. temperaturecooled to room temperature
4. washThe solution was washed twice with ether
5. filtrationThe precipitate was collected by filtration