反应详情

To a solution of Example 204 (0.8 g, 1.14 mmol, 1.0 eq.) in methanol (10 mL) was added potassium carbonate (0.078 g, 0.57 mmol, 0.5 eq.) at room temperature. The reaction mixture was allowed to stir at room temperature for 18 hours and then concentrated under reduced pressure. The resulting residue was washed with distilled water (10 mL) and extracted with ethyl acetate (3×10 mL). The combined extracts were dried over magnesium sulfate, filtered and concentrated under reduced pressure to afford the desired product as pale yellow oil (0.75 g, 97%). 1H NMR (CDCl3) δ10.68 (s, 1 H), 7.73 (d, 1H), 7.26-7.14 (m, 4H), 6.94 (dd, 1H), 6.86-6.75 (m, 5H), 4.21-4.02 (m, 2H), 3.83 (s, 3H), 3.80-3.56 (m, 4H), 3.40-3.21 (m, 2H), 2.80-2.67 (m, 2H), 1.95-1.92 (m, 1H), 1.65-1.60 (m, 1H), 1.38 (s, 9H), 0.83 (s, 9H), 0.001 (s, 6H).

1. concentrationconcentrated under reduced pressure
2. washThe resulting residue was washed with distilled water (10 mL)
3. extractionextracted with ethyl acetate (3×10 mL)
4. dry with materialThe combined extracts were dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure