反应详情

温度

170 °C

A mixture of 4-hydroxy-6-methyl-2-pyrone (10.0 g, 0.079 mol) and 2,6 difluoroaniline (9.5 g, 0.073 mol) was heated at 170° C. under argon atmosphere for 20 min. The water formed was removed using a Dean-stark apparatus. The melt was cooled, the dark solid was tritutrated with EtOAc., and filtered. This material was washed thoroughly with EtOAc to afford the desired product 1-(2,6-difluorophenyl)-4-hydroxy-6-methylpyridin-2(1H)-one 6.5 g (35%) as a light brown solid: 1H NMR (CD3OD/400 MHz) δ7.56 (m, 1H), 7.19 (m, 2H), 6.09 (m, 1H), 5.77 (d, 1H, J=2.4 Hz), and 1.99 (s, 3H); ES-HRMS m/z 238.0679 (M+H C12H10NO2F2 requires 238.0674).

1. customwas removed
2. temperatureThe melt was cooled
3. filtration, and filtered
4. washThis material was washed thoroughly with EtOAc