化学合成。
化学合成
合成路线 1(1. 合成:419536-33-7)
产率:81%
合成条件:Stage #1: With n-butyllithium In tetrahydrofuran; hexane at -78℃; for 1 h; Stage #2: With Triisopropyl borate In tetrahydrofuran; hexane at -78 - 20℃; for 12 h;
实验步骤:将化合物3-1(35g,108.6mmol)溶解在THF(600mL)中,并在-78℃下向反应混合物中加入n-BuLi(52mL,130.35mmol,2.5M的己烷溶液),反应混合物 搅拌1小时。 将反应混合物在室温下搅拌12小时,同时向反应混合物中缓慢加入B(Oi-Pr)3(37mL,162.9mmol),并缓慢升高温度。 用EA萃取后,将得到的有机层用无水MgSO 4干燥,除去残留的水分,在减压下蒸馏除去溶剂,用EA和己烷重结晶,得到化合物3-2(25g,81%)。。
参考文献:
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合成路线 2(2. 合成:419536-33-7)
产率:85%
合成条件:Stage #1: With n-butyllithium In tetrahydrofuran; hexane at -78 - -70℃; for 1.50 h; Inert atmosphere Stage #2: at -70 - 20℃; Inert atmosphere
实验步骤:向含有2-2(11.13g,34.67mmol)的150mL无水THF的200mL双颈圆底烧瓶中,在-78℃下滴加2.4M n-BuLi的己烷溶液(10mL,24mmol)。 N2保护。 在低于-70℃的温度下搅拌1.5小时后,将B(OMe)3(8mL,71.8mmol)滴加到反应混合物中。 将溶液混合物搅拌过夜,并缓慢升温至环境温度。 之后,将溶液用水淬灭并用乙酸乙酯萃取。 将合并的有机层用饱和NaCl(aq)洗涤并经Na 2 SO 4干燥。 因此,使用柱色谱法浓缩和纯化,得到白色固体8.46g,收率85%,将其直接用于下一步骤。
参考文献:
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合成路线 3(3. 合成:419536-33-7)
产率:86%
合成条件:Stage #1: With n-butyllithium In tetrahydrofuran; hexane for 1 h; Inert atmosphere Stage #2: Inert atmosphere
实验步骤:将Cz-PhBr(15mmol)溶解在烧瓶中的THF中,用Ar气体置换三次。 冷却至78°C 10分钟后。 滴加正丁基锂(t-BuLi,11mL,1.6mol L1的己烷溶液)并在78℃下搅拌1小时。 将三异丙基硼酸盐(23mmol)滴入烧瓶中并在78℃下搅拌另外1小时,缓慢升温至室温并搅拌过夜。 将盐酸(HCl,30mL,2mol L1)加入烧瓶中并再搅拌30分钟。 产物用二氯甲烷(CH 2 Cl 2)萃取。 蒸发后,用纯石油醚洗涤粗产物。 白色粉末,产量为86%。
参考文献:
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