化学合成。
医药; 香料; 染料
合成路线 1(1. 合成:2316-64-5)
产率:84%
合成条件:With sodium tetrahydroborate In ethanol at 0 - 20℃; for 18 h; Schlenk technique; Inert atmosphere
实验步骤:根据文献使用改进的合成方法制备化合物:在0℃下,将5-溴-2-羟基苯甲醛(10.1g,50mmol)溶解在250mL乙醇中。 将NaBH 4(1.88g,50mmol)分批(0.3g)加入到搅拌的溶液中。 将混合物在室温下搅拌18小时。 在减压(10 2毫巴)下除去乙醇后,将得到的浅黄色固体溶于200mL饱和NH 4 Cl水溶液中。 将粗产物用乙醚(三次80mL)萃取。 将有机相用盐水洗涤(三次,20mL)并用MgSO 4干燥2小时。 通过过滤除去MgSO 4并在减压(10 2 mbar)下过量溶剂后,通过快速色谱法用二氧化硅(洗脱液:正己烷/乙酸乙酯 - 体积比为8/2)纯化产物,蒸发后得到无色固体。 溶剂(8.52克,84%);
参考文献:
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合成路线 2(2. 合成:2316-64-5)
产率:60%
合成条件:Stage #1: With lithium aluminium tetrahydride In tetrahydrofuran at 20℃; for 16 h; Stage #2: With hydrogenchloride In tetrahydrofuran; water
实验步骤:步骤3 4-溴-2-(羟甲基)苯酚:将5-溴-2-羟基苯甲酸(21.7g; 100mmol; 1.00当量)的四氢呋喃(200mL)溶液加入到氢化铝锂的悬浮液中( 5.7g; 150mmol; 1.50当量)的四氢呋喃(100mL)溶液。 将该悬浮液在环境温度下粗暴搅拌约16小时,然后通过加入3M盐酸(300mL)淬灭。 用乙酸乙酯进行标准萃取后处理后,将粗残余物用乙酸乙酯/己烷(1/10)重结晶,得到标题产物,为灰色固体(12.4g; 60%收率)。 1 H NMR(400MHz,CDCl 3)δ:9.68(s,1H),7.39(s,1H),7.19(dd,J = 2.0,2.0Hz,1H),6.72(d,J = 8.4Hz,1H), 5.10(s,1H),4.44(s,2H)。
参考文献:
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