反应详情

A mixture of the product from Example 133B (129.4 mg, 0.3714 mmol), iron powder (128 mg, 2.284 mmol), ammonium chloride (130 mg, 2.433 mmol) in water (1 mL) and ethanol (2 mL) was heated at 70° under a nitrogen atmosphere for 1 hour. The reaction was cooled to room temperature and vacuum filtered, washing the residue with methanol. The filtrate was concentrated under vacuum and azeotroped with toluene (50 mL). The residue was purified by silica gel flash chromatography using methylene chloride as eluent to provide the title compound as a waxy solid (85 mg, 72%).

1. temperaturewas heated at 70° under a nitrogen atmosphere for 1 hour
2. filtrationvacuum filtered
3. washwashing the residue with methanol
4. concentrationThe filtrate was concentrated under vacuum
5. customazeotroped with toluene (50 mL)
6. customThe residue was purified by silica gel flash chromatography