反应详情

A mixture of Example 179A (0.18 g, 0.7 mmol), acetic anhydride (0.2 mL), and pyridin (1 mL) was stirred at room temperature for 18 h. The solution was diluted with water (3 mL) and extracted with ethyl acetate (2× 1 mL). The combined organic extracts were dried (Na2SO4) and concentrated in vacuo. Column chromatography on silica (hexane to 5% ethyl acetate/hexane) afforded product as a colorless oil (0.17 g, 81%). 1H NMR (300 MHz, CDCl3) δ ppm 0.66 (m, 1H), 0.76 (dd, J=9.56, 6.62 Hz, 6H), 0.89 (m, 1H), 1.38 (m, 1H), 1.61 (m, 1H), 1.81 (s, 3H), 1.95 (m, 1H), 3.50 (s, 2H), 3.58 (s, 3H), 4.24 (d, J=10.66 Hz, 1H), 4.42 (d, J=10.66 Hz, 1H), 5.01 (t, J=3.49 Hz, 1H), 7.20 (m, 4H).

1. extractionextracted with ethyl acetate (2× 1 mL)
2. dry with materialThe combined organic extracts were dried (Na2SO4)
3. concentrationconcentrated in vacuo