反应详情

温度

-10 °C

The product from step (a) (2.074 g, 12.1 mmol) was dissolved in anhydrous tetrahydrofuran (30 ml) and the solution cooled to −10° C. Vinyl magnesium bromide (1M, 14.5 ml, 14.5 mmol) was added dropwise, keeping the temperature below 0° C. The resultant solution was stirred at 0° C. for 2.5 h, then allowed to warm to room temperature. The reaction mixture was slowly poured into aqueous 2M hydrochloric acid (200 ml) and ice. Extracted with ethyl acetate (3×70 ml) and the combined extracts were washed with water (2×30 ml) and brine (20 ml), dried (magnesium sulphate) and evaporated in vacuo to give the title compound (1.288 g, 77%).

1. customthe temperature below 0° C
2. temperatureto warm to room temperature
3. extractionExtracted with ethyl acetate (3×70 ml)
4. washthe combined extracts were washed with water (2×30 ml) and brine (20 ml)
5. dry with materialdried (magnesium sulphate)
6. customevaporated in vacuo