反应详情

To a solution of methyl 6-bromo-5-nitropyridin-2-ylcarbamate (700 mg, 2.5 mmol) in CH3OH (20 mL) was added NiCl2 (1.2 g, 5.1 mmol) and NaBH4 (300 mg, 7.6 mmol) successively at 0° C. The mixture was stirred for 20 seconds. The reaction mixture was diluted with water and extracted with ethyl acetate (20 mL×3). The combined organic layers were dried over anhydrous Na2SO4 and evaporated under vacuum to give methyl 5-amino-6-bromopyridin-2-ylcarbamate (600 mg, 96%). 1H NMR (400 MHz, CDCl3) δ 7.75 (d, J=8.4 Hz, 1H), 7.13 (brs, 1H), 7.09 (d, J=8.8 Hz, 1H), 3.81 (s, 3H).

1. extractionextracted with ethyl acetate (20 mL×3)
2. dry with materialThe combined organic layers were dried over anhydrous Na2SO4
3. customevaporated under vacuum