反应详情

温度

25 °C

A solution of the product of Example 312E (434 mg, 1.54 mmol) in acetic acid (4.3 mL) and dioxane (4.3 mL) was reacted with iron powder (343 mg, 6.15 mmol) at 50° C. for 3 hours. The reaction mixture was cooled to 25° C., filtered through a pad of celite® (diatomaceous earth) and the filtrate was concentrated under reduced pressure. The residue was dissolved in dichloromethane and washed with a saturated aqueous sodium bicarbonate solution. The aqueous layer was extracted with dichloromethane (2×) and the combined organic layers were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was chromatographed on silica gel using a gradient of methanol in dichloromethane (0-5%) to give the title compound (180 mg, 46%). MS (ESI+) m/z 253 (M+H)+. 1H NMR (300 MHz, DMSO-d6) δ ppm 5.24 (s, 2H), 7.22-7.39 (m, 5H), 7.43 (s, 1H).

1. filtrationfiltered through a pad of celite® (diatomaceous earth)
2. concentrationthe filtrate was concentrated under reduced pressure
3. dissolutionThe residue was dissolved in dichloromethane
4. washwashed with a saturated aqueous sodium bicarbonate solution
5. extractionThe aqueous layer was extracted with dichloromethane (2×)
6. dry with materialthe combined organic layers were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe residue was chromatographed on silica gel using a gradient of methanol in dichloromethane (0-5%)