反应详情

A solution of Example 34E (3.5 g, 14 mmol) in water (50 mL) was heated to reflux, treated dropwise with a solution of CuSO4 (2.8 g, 17.5 mmol) in water (20 mL), refluxed for 2 hours, cooled to room temperature, adjusted to pH 7 with saturated NaHCO3 (aq), and extracted with ethyl acetate (2×25 mL). The combined extracts were concentrated and the residue was purified by flash column chromatography on silica gel with 1:1 hexanes/ethyl acetate to provide the desired product (0.7 g, 24%).

1. temperatureto reflux
2. temperaturerefluxed for 2 hours
3. extractionextracted with ethyl acetate (2×25 mL)
4. concentrationThe combined extracts were concentrated
5. customthe residue was purified by flash column chromatography on silica gel with 1:1 hexanes/ethyl acetate