化学合成。
医药
合成路线 1(1. 合成:21075-83-2)
产率:97%
合成条件:With sodium hydroxide In methanol at 0 - 20℃; for 4 h;
实验步骤:将甲基肼(7)(26g,564mmol)和氢氧化钠(23g,575mmol)溶解在甲醇(500mL)中。 在0℃下,在2小时内向该溶液中滴加二碳酸二叔丁酯(123g,564mmol)的甲醇(500mL)溶液。将反应溶液在室温下搅拌2小时,沉积物 通过硅藻土过滤除去,滤液真空蒸发。 加入油状残余物,用氯化铵水溶液中和。用二氯甲烷萃取溶液,用MgSO 4干燥,然后蒸发,得到标题化合物8(79g,97%)。1H NMR(CDCl3)d:4.06(br, 2H),3.05(s,3H),1.47(s,9H); IR(纯)1694,1365,1154 cm1。
参考文献:
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合成路线 2(2. 合成:21075-83-2)
产率:82%
合成条件:With sodium hydrogencarbonate In tetrahydrofuran; water at 5℃; for 12 h;
实验步骤:将7.2g甲基肼硫酸盐(49.9mmol)加入到144ml水中,冷却至5℃,加入4.6g NaHCO 3固体,用NaOH水溶液将pH调节至10.将144ml溶液(Boc) 滴加2O(49.95mmol)的四氢呋喃溶液,搅拌混合物12小时,用TLC(展开溶剂:石油醚/乙酸乙酯= 2/1)完全观察反应。用乙酸乙酯萃取( 合并有机相,用盐水洗涤。用无水硫酸钠干燥,减压浓缩,得到6.0g(产率82%)无色透明的式I化合物。
参考文献:
- [1] Patent: CN108129357, 2018, A. Location in patent: Paragraph 0102; 0104 [2] European Journal of Organic Chemistry, 2010, # 20, p. 3815 - 3822
合成路线 3(3. 合成:21075-83-2)
产率:79%
合成条件:Stage #1: With sodium hydrogencarbonate In water at 0℃; Stage #2: at 20℃;
实验步骤:(1)N-Boc-N-甲基肼的制备[248] BOC“'νH2[249]在冰水外浴下,向搅拌的甲基肼硫酸盐(100g,0.693mol)在水(2.0L)中的悬浮液中小心 加入NaHCO 3至pH 11-12。剧烈搅拌反应混合物,将DiBoc(1.1当量)的THF(2.0L)溶液倒入溶液中,室温搅拌过夜后,除去有机层,用乙酸乙酯萃取。 合并的溶液经硫酸钠干燥并真空蒸发,得到标题化合物(80g,79%,为浅黄色油状化合物),其不经进一步纯化即用于下一步骤。
参考文献:
- [1] Patent: WO2007/139346, 2007, A1. Location in patent: Page/Page column 49