反应详情

温度

40 °C

Acetic anhydride (0.623 mL, 6.60 mmol) was added to a solution of crude (R)-1-((3-amino-6-bromopyridin-2-yl)(benzyl)amino)propan-2-ol (2.22 g, 6.60 mmol) and pyridine (1.60 mL, 19.8 mmol) in dichloromethane (60 mL). The reaction mixture was then heated to 40° C. for 39 h. The reaction mixture was concentrated under reduced pressure. The crude residue was dissolved in toluene (ca. 100 mL), which was then concentrated under reduced pressure in order to remove residual pyridine. The crude product was purified by column chromatography on silica gel (eluting with 2:1 dichloromethane-ethyl acetate followed by 3:2 dichloromethane-ethyl acetate) to afford (R)-N-(2-(benzyl(2-hydroxypropyl)amino)-6-bromopyridin-3-yl)acetamide (1.39 g, 56% yield). MS (ESI, pos. ion) m/z 378, 380 [M+1]+.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. dissolutionThe crude residue was dissolved in toluene (ca. 100 mL)
3. concentrationwhich was then concentrated under reduced pressure in order
4. customto remove residual pyridine
5. customThe crude product was purified by column chromatography on silica gel (eluting with 2:1 dichloromethane-ethyl acetate followed by 3:2 dichloromethane-ethyl acetate)