反应详情

2,6-Dibromo-3-nitropyridine (2.59 g, 9.20 mmol) and triethylamine (2.70 mL, 19.37 mmol) were added to a solution of (R)-1-(benzylamino)propan-2-ol (1.6 g, 9.68 mmol) in ethanol (35 mL). The solution was stirred at rt for 17 h and then concentrated under reduced pressure. The residue was partitioned between ethyl acetate and saturated aqueous sodium bicarbonate solution (25 mL). The layers were separated, and the organic layer was washed with 5% aqueous sodium chloride solution (25 mL). The ethyl acetate layer was concentrated under reduced pressure to afford an orange syrup. The crude product was purified by column chromatography on silica gel (eluting with 5:1 hexanes-ethyl acetate followed by 3:1 hexanes-ethyl acetate) to afford (R)-1-(benzyl(6-bromo-3-nitropyridin-2-yl)amino)propan-2-ol (3.01 g, 85%) as a bright yellow syrup. MS (ESI, pos. ion) m/z 388, 390 [M+Na]+.

1. concentrationconcentrated under reduced pressure
2. customThe residue was partitioned between ethyl acetate and saturated aqueous sodium bicarbonate solution (25 mL)
3. customThe layers were separated
4. washthe organic layer was washed with 5% aqueous sodium chloride solution (25 mL)
5. concentrationThe ethyl acetate layer was concentrated under reduced pressure
6. customto afford an orange syrup
7. customThe crude product was purified by column chromatography on silica gel (eluting with 5:1 hexanes-ethyl acetate followed by 3:1 hexanes-ethyl acetate)