反应详情

温度

60 °C

Lithium hydroxide (0.310 g, 7.29 mmol) dissolved in water (2 mL) was added to a solution of iv (0.250 g, 0.730 mmol) in EtOH (2 mL) THF (5 mL). The mixture was warmed to 60° C. for 3 h, cooled to room temperature and reduced in vacuo. The resulting residue was re-dissolved in water (2 mL) and the pH adjusted to pH 2-3 using conc. HCl (35%). The resulting colourless precipitate was filtered, washed with water and dried in vacuo to give vi (0.219 g, 0.695 mmol, 95%) as a colourless powder. 1H NMR (300 MHz, DMSO-d6): δ 9.10 (1H, s), 8.65-8.57 (2H, m), 8.07 (1H, br), 7.75 (1H, dt, J 8.2 and 1.5), 7.38 (1H, dd, J 7.7 and 4.6), 6.64 (1H, s), 4.45 (2H, d, J 6.1), 3.14 (2H, dq, J 7.2 and 5.6), 1.05 (3H, t, J 7.2); [M+H]+ m/z=316.1.

1. temperaturecooled to room temperature
2. filtrationThe resulting colourless precipitate was filtered
3. washwashed with water
4. customdried in vacuo