反应详情

5-Bromo-2-chloropyrimidine 4 (50 mmol), 4-methyl-3-nitroaniline (60 mmol) and methylsulphonic acid (15 mmol) are heated at reflux in 1,4-dioxane (100 mL) for 16 h. The mixture is poured into water, filtered and dried under vacuum to give 5-bromo-N-(4-methyl-3-nitrophenyl)pyrimidin-2-amine 27 as a yellow solid. 1H NMR (400 MHz, d6-DMSO) δ 10.25 (s, 1H), 8.68 (s, 2H), 8.49 (d, J=2.0 Hz, 1H), 7.86 (dd, J=2.4, 8.4 Hz, 1H), 7.41 (d, J=8.4 Hz, 1H), 2.46 (s, 3H). MS (m/z) (M+1)+: 309.0, 311.0.

1. filtrationfiltered
2. customdried under vacuum