反应详情

To a stirred suspension of 4-chloro-imidazo[1,2-a]quinoxaline (28.9 g, 141.8 mmol) in THF/NMP 2:1 (300 mL) was added NBS (25.2 g, 141.8 mmol) in one portion at rt. After 18 h stirring, additional 12.6 g (70.9 mmol) NBS were added and the mixture was stirred for additional 2 h at rt. After removal of the THF portion of the organic phase by vacuum evaporation, water was added (500 mL). The precipitate was filtered and the residue was washed with water and dried to give 1-bromo-4-chloro-imidazo[1,2-a]quinoxaline as an off-white solid (35 g, 78.6%): 1H-NMR (300 MHz, d6-DMSO): δ=12.42 (1H, s), 8.19 (1H, s), 7.75 (1H, d), 7.44 (2H, m) ppm. UPLC-MS: RT=1.14 min; m/z 284.6 [MH+]; required MW=283.5.

1. stirringthe mixture was stirred for additional 2 h at rt
2. customAfter removal of the THF portion of the organic phase
3. customby vacuum evaporation, water
4. additionwas added (500 mL)
5. filtrationThe precipitate was filtered
6. washthe residue was washed with water
7. customdried