反应详情

A solution of Example 223 (0.45 g, 10.8 mmol) in THF at −78° C. was treated with 5.4 mL DIBAL-H solution (1.0M in toluene, 5.4 mmol) and methanol (1 mL), warmed to room temperature, and concentrated. The residue was dissolved in methanol (100 mL), treated with silica gel (5 g), and concentrated. The preabsorbed silica gel was subsequently transferred to a silica gel column and chromatographed (ethyl acetate/heptane 3:1) to provide 200 mg (49%) of the product.

1. concentrationconcentrated
2. dissolutionThe residue was dissolved in methanol (100 mL)
3. additiontreated with silica gel (5 g)
4. concentrationconcentrated
5. customchromatographed (ethyl acetate/heptane 3:1)