化学合成。
化学合成
合成路线 1(1. 合成:31686-94-9)
产率:96%
合成条件:at 10℃;
实验步骤:4-(4-氟苯基)-2,4-二氧代丁酸乙酯的合成:在装有回流冷凝器和CaCl2干燥管的2L圆底烧瓶中,将金属钠(49.9g,2.17mol,3.0当量)溶解在乙醇中。 (1.0升)仔细。 将得到的乙醇钠溶液冷却至约10℃,然后将1-(4-氟苯基)乙-1-酮(100.0g,0.72mol)和草酸二乙酯(2)的混合物(295mL,2.17mol,3.0当量) 。)慢慢倒进去。 将反应混合物搅拌约15分钟,然后在冰箱中静置过夜。 将反应混合物倒入锥形混合物中。 HCl溶液(300mL)和冰(约1kg)。 滤出所得沉淀物并用大量水洗涤,最后在真空干燥器中用P 2 O 5 / KOH干燥。 产量:165.5g(3)(96%),为浅黄色粉末。
参考文献:
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合成路线 2
产率:100%
合成条件:With sodium hydride In N,N-dimethyl-formamide at 0 - 45℃; for 1.75 h;
实验步骤:一般步骤:在三颈烧瓶中,在0℃下将苯乙酮(5g,41.61mmol)和草酸二乙酯(6.76mL,50mmol)溶于无水DMF(65mL)中,并将NaH 60%(2g,83.25mmol)溶解。 缓慢加入混合物,将混合物在0℃下搅拌15分钟并在室温下再搅拌30分钟,然后在45℃下加热1小时。 将反应物倒入水 - 乙酸中,用乙酸乙酯萃取产物。 合并有机层,用水和盐水洗涤,用硫酸镁干燥,过滤并浓缩,得到标题化合物,为油状物(62%收率)。 LRMS:m / z 221(M + 1)+保留时间:6.30分钟(方法B)
参考文献: