反应详情

温度

15 °C

To a stirred suspension of compound 3 (974 g, 3.63 mol) in MeOH (4000 mL) was slowly added NaBH4 (121 g, 3.20 mol) at 0-20° C. The solution was left stirring at 15° C. for 3 hours, and then cooled to 0° C. 2N HCl (aq) (1300 mL) was added dropwise at below 20° C. The solution was then filtered and evaporated to dryness, and the residue was dissolved in MTBE (5 L). The solution was then washed with water (2 L×2) and brine (1.5 L×1). Evaporation of the solvent gave compound 4 as a light-yellow solid which was used in the next reaction without further purification. 1H NMR (DMSO-d6; 400 MHz) δ 7.40 (m), δ 7.32 (m), δ 7.17 (m), δ 6.91 (m), δ 5.09 (s), δ 5.00 (t), δ 4.56 (d), δ 1.26 (s).

1. customat 0-20° C
2. waitThe solution was left
3. temperaturecooled to 0° C
4. filtrationThe solution was then filtered
5. customevaporated to dryness
6. dissolutionthe residue was dissolved in MTBE (5 L)
7. washThe solution was then washed with water (2 L×2) and brine (1.5 L×1)
8. customEvaporation of the solvent