反应详情

To a solution of 6-bromo-5-nitropyridin-2-amine (1.4 g, 10 mmol), Et3N (2.0 g, 20 mol) and DMAP (70 mg) in CH2Cl2 (20 mL) was added ClCO2Me (1.3 g, 10 mmol) drop-wise at 0° C. The mixture was stirred overnight. 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 6-bromo-5-nitropyridin-2-ylcarbamate (1.4 g, 82%). 1H NMR (400 MHz, DMSO) δ 10.78 (brs, 1H), 8.56 (d, J=9.2 Hz, 1H), 8.05 (d, J=8.4 Hz, 1H), 3.70 (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