化学合成。
化学合成
合成路线 1(1. 合成:102191-92-4)
产率:100%
合成条件:Stage #1: With oxalyl dichloride; dimethyl sulfoxide In dichloromethane at -78℃; for 0.50 h; Inert atmosphere Stage #2: With triethylamine In dichloromethane at -78 - 20℃; for 1.50 h; Inert atmosphere
实验步骤:在-78℃,在N 2下,向(COCl)2(13.7mL,162.2mmol)的无水CH 2 Cl 2(400mL)溶液中加入DMSO(25.1mL,353.9mmol)。 搅拌30分钟后,滴加2 - ((叔丁基二甲基甲硅烷基)氧基)乙醇(26.0g,147.5mmol)的无水CH 2 Cl 2(100mL)溶液。 将混合物在-78℃下搅拌30分钟,然后滴加Et 3 N(102.74mL,737.0mmol)。 在-78℃下搅拌30分钟后,将反应混合物温热至室温并搅拌1小时。 将反应混合物用2N HCl水溶液酸化至pH = 4,然后用CH 2 Cl 2(3×400mL)萃取。 合并的有机层用无水Na 2 SO 4干燥,过滤并减压浓缩,得到2 - ((叔丁基二甲基甲硅烷基)氧基)乙醛(34.0g,100%),为无色油状物。 该物质无需进一步纯化直接用于下一步。
参考文献:
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合成路线 2(2. 合成:102191-92-4)
产率:97%
合成条件:Stage #1: With ozone In dichloromethane at -78℃; Stage #2: With triphenylphosphine In dichloromethane at -78 - 23℃; for 1.50 h; Inert atmosphere
实验步骤:将双 - 甲硅烷基醚5(1.00g,3.16mmol,1.00当量)在CH 2 Cl 2(21.1mL)中的溶液冷却至-78℃并鼓泡通入臭氧直至溶液变为蓝色。 然后将N 2气体鼓泡通过溶液直至反应混合物变为无色。 然后加入PPh 3(0.99g,3.79mmol,1.20当量),将混合物缓慢温热至23℃。 将反应混合物在N 2下搅拌1.5小时,并将溶剂真空蒸发。 通过硅胶色谱法(1:8EtOAc:己烷)纯化残余物,得到醛6(1.07g,97%收率)。
参考文献:
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