反应详情

To a solution of intermediate 50 (Example 100) (3.5 g, 13 mmol) in dioxane (40 mL) was added pyrrolidine (2.1 mL, 25 mmol), followed by cesium carbonate (8.2 g, 25 mmol). The mixture was stirred at room temperature for 15 h and poured into water. The mixture was extracted with ethyl acetate and the organic layer separated, washed with brine, dried over Na2SO4 and filtered. The filtrate was concentrated and the residue purified by flash chromatography on silica gel (10% MeOH/DCM to 25% MeOH and 2% TEA/DCM) to afford the title compound (1.8 g, 53%) as a pale orange oil.

1. extractionThe mixture was extracted with ethyl acetate
2. customthe organic layer separated
3. washwashed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationThe filtrate was concentrated
7. customthe residue purified by flash chromatography on silica gel (10% MeOH/DCM to 25% MeOH and 2% TEA/DCM)