反应详情

To a solution of the material from Step A (0.5 g, 1.0 mmol) in THF (10 mL) at 0° C. was added sequentially 30% hydrogen peroxide (0.18 mL, 1.5 mmol) and 3N aqueous sodium hydroxide (0.35 g, 1.0 mmol). After 2 h at this temperature water (30 mL) was added, and the resulting solution was adjusted to pH 5 by the addition of 1N hydrochloric acid. The mixture was extracted with ethyl acetate, and the combined extracts were washed with saturated sodium thiosulfate until the organic phase showed a negative peroxide test. The combined organics were washed with brine, dried (magnesium sulfate), and concentrated in vacuo. The residue was purified by silica gel chromatography (50% ethyl acetate in hexane) to give the title compound as a white foam. LC/MS 389.3 (M+Na).

1. extractionThe mixture was extracted with ethyl acetate
2. washthe combined extracts were washed with saturated sodium thiosulfate until the organic phase
3. washThe combined organics were washed with brine
4. dry with materialdried (magnesium sulfate)
5. concentrationconcentrated in vacuo
6. customThe residue was purified by silica gel chromatography (50% ethyl acetate in hexane)