反应详情

A mixture of the product from Example 87 (0.15 g, 0.5 mmol) and N-bromosuccinimide (0.23 g, 1 mmol) in 2 mL dimethylformamide was stirred at room temperature for 18 hours. The solution was poured onto methylene chloride/water and separated and the water layer back extracted with methylene chloride. The combined organic layers were washed with water, dried over sodium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography (4:1 to 1:1 heptane:ethyl acetate as eluant) to give the title compound (0.15 g, 81% yield).

1. additionThe solution was poured onto methylene chloride/water
2. customseparated
3. extractionthe water layer back extracted with methylene chloride
4. washThe combined organic layers were washed with water
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by silica gel chromatography (4:1 to 1:1 heptane:ethyl acetate as eluant)