反应详情

温度

-70 °C

To a stirred solution of (2R,6S)-4-(6-((tert-butyldiphenylsilyloxy)methyl)-2,3-difluorophenyl)-2,6-dimethylmorpholine (Intermediate 3, 1 g, 2.02 mmol) in THF (8 mL) was added sBuLi (1.3 M in cyclohexane/hexanes, 3.1 ml, 4.03 mmol) at −70° C. under nitrogen atmosphere. After stirring for 1 h at this temperature, N-methoxy-N-methylfuran-2-carboxamide (0.939 g, 6.05 mmol) was added in 3 ml of THF. After stirring for 1½ h at −70° C., the reaction quenched with sat. ammonium chloride solution and the aqueous layer extracted by ethyl acetate (2×100 mL). The organic phases were combined, dried (Na2SO4), and concentrated. The residue purified over a silica gel flash column using a gradient of ethyl acetate in hexanes to give the title compound (0.90 g, 76%).

1. customthe reaction quenched with sat. ammonium chloride solution
2. extractionthe aqueous layer extracted by ethyl acetate (2×100 mL)
3. dry with materialdried (Na2SO4)
4. concentrationconcentrated
5. customThe residue purified over a silica gel flash column