反应详情

温度

25 °C

A solution of the product of Example 1B (7.63 g, 32.61 mmol) and potassium trimethylsilanoate (23.2 g of 90% material, 163 mmol) in tetrahydrofuran (163 mL) was warmed at reflux for 18 hours. The solution was cooled to 25° C. and concentrated in vacuo to remove the tetrahydrofuran. A solution of the residue in water (250 mL) was cooled to 0° C., and adjusted to pH 1 by addition of 4 N HCl solution. The resulting precipitate was collected by filtration, washed with water and dried to give the title compound (6.78 g, 95%). 1H NMR (300 MHz, CDCl3): δ 7.25 (m, 5 H), 1.99 (m, 4 H), 1.12 (m, 4 H), 0.90 (t, J=7.17 Hz, 6 H).

1. temperatureat reflux for 18 hours
2. concentrationconcentrated in vacuo
3. customto remove the tetrahydrofuran
4. temperatureA solution of the residue in water (250 mL) was cooled to 0° C.
5. additionadjusted to pH 1 by addition of 4 N HCl solution
6. filtrationThe resulting precipitate was collected by filtration
7. washwashed with water
8. customdried