6-Amino-3-chloropyridazine → 3-Amino-4-bromo-6-chloropyridazine

関与物質

反応手順

To a solution of 6-Chloro-pyridazin-3-ylamine (4 g, 31 mmol) in methanol (60 mL) was added NaHCO3 (5.2 g, 62 mmol). The reaction mixture was stirred for 30 minutes at RT then Br2 (4.9 g, 31 mmol) was added drop wise. Then the resulting reaction mixture was stirred additionally for 16 h at RT. After completion of reaction, the reaction mass concentrated under reduced pressure, crude purified by silica gel (100-200 mesh) chromatography using EtOAc/Hexane (8:2) to afford 4-Bromo-6-chloro-pyridazin-3-ylamine (2.3 g, 36%) as a solid.

情報源と証拠