化学合成。
医药化工
合成路线 1(1. 合成:603-86-1)
产率:89%
合成条件:Stage #1: With methyl trifluoromethanesulfonate In toluene at 100℃; for 2 h; Inert atmosphere Stage #2: With sodium In methanol; toluene at 80℃; for 0.50 h; Inert atmosphere
实验步骤:(4)2-(2-氯-6-硝基苯氧基)吡啶0.5mmol,0.08ml三氟甲磺酸甲酯,在氮气气氛下,在三个反应烧瓶中,在100±2小时下溶于20ml甲苯中。 除去溶剂后,在80分钟的氮气保护下,加入10mmol,20ml甲醇的金属钠。 在通过TLC,乙酸乙酯完成反应后,将萃取物经无水硫酸钠干燥以在减压下通过柱色谱法(洗脱液比率:石油醚至乙酸乙酯体积比6:1)除去溶剂,得到2- 氯-6-硝基 - 苯酚(89%收率)。
参考文献:
- [1] Patent: CN104262159, 2016, B. Location in patent: Paragraph 0059; 0060; 0061 [2] Patent: CN105085275, 2017, B. Location in patent: Paragraph 0059-0060 [3] Journal of Organic Chemistry, 2014, vol. 79, # 23, p. 11508 - 11516
合成路线 2(2. 合成:603-86-1)
产率:18%
合成条件:With nitric acid In acetic acid at 5℃; for 1.25 h;
实验步骤:向冷却至5℃的2-氯苯酚(0.155mol,15.8mL)在冰醋酸(42mL)中的溶液中,在45分钟内用恒定磁力滴加硝酸(0.163mol,6.8mL)。搅拌。 将反应在5℃保持30分钟,然后倒入冰(~250mL)中。 通过过滤除去反应过程中形成的黑色固体。 将得到的深棕色液体蒸汽蒸馏,得到黄色固体,将其从水中重结晶,得到标题化合物,收率18%。
参考文献:
- [1] Chinese Chemical Letters, 2010, vol. 21, # 4, p. 403 - 406 [2] Synthetic Communications, 2011, vol. 41, # 20, p. 2985 - 2992 [3] Journal of Medicinal Chemistry, 1996, vol. 39, # 18, p. 3435 - 3450 [4] Bioorganic and Medicinal Chemistry Letters, 2014, vol. 24, # 15, p. 3521 - 3525 [5] Journal of the Chemical Society, 1927, p. 1692 [6] Yakugaku Zasshi, 1925, # 517, p. 15 [7] Chem. Zentralbl., 1926, vol. 97, # I, p. 80 [8] Patent: CN104262159, 2016, B [9] Patent: CN105085275, 2017, B [10] Patent: CN107915677, 2018, A. Location in patent: Paragraph 0013; 0014
合成路线 3(3. 合成:603-86-1)
产率:92%
合成条件:With silica supported Al(NO 3 )3*9H 2 O In acetone at 20℃; for 0.42 h;
实验步骤:通用方法:向苯酚(1mmol)的丙酮(5mL)溶液中加入二氧化硅负载的Al(NO 3)3·9H 2 O(1mmol),并将得到的混合物在室温下搅拌。 反应完成后,如TLC所示,过滤反应物料,用乙酸乙酯(25mL)洗涤残余物(二氧化硅)。 将滤液和洗涤物在减压下共同浓缩,并将粗制化合物用柱色谱法二硅胶(100-200目)纯化,得到纯的邻硝基苯酚(95%)和对硝基苯酚(3%)。
参考文献:
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