化学合成。
化学合成
合成路线 1(1. 合成:16932-44-8)
产率:71%
合成条件:Stage #1: With n-butyllithium In diethyl ether; hexane at -35℃; for 30 h; Stage #2: With iodine In diethyl ether at 20℃; for 24 h;
实验步骤:向1,3-二甲氧基苯(25g,180mmol)的乙醚(150mL)溶液中缓慢加入丁基锂(112.5mL 1.6M己烷溶液,180mmol)。 将反应搅拌30小时,然后冷却至-35℃。 加入碘(45.7g,180mmol)并将反应在20℃下搅拌24小时,然后倒入10%氯化二甲酸(60mL)中。 将水相分离并用乙酸乙酯(2×60mL)萃取,并将合并的有机萃取液用饱和硫代硫酸钠水溶液(60mL),盐水(60mL)洗涤,经硫酸钠干燥,过滤并真空浓缩。 通过结晶(二乙醚)纯化产物,得到16(34g,71%),为白色固体; 熔点105-106℃(Lit.104℃)[1]; 1 H NMR(CDCl 3):δ3.80(s,6H),6.43(d,J 8.4,2H),7.17(t,J 8.4,1H); 13C NMR(CDCl3):δ56.6,76.3,103.9,129.8,159.5; C8H9IO2的分析计算值:C,36.39; H,3.44; 实测值:C,36.40; H,3.46。
参考文献:
- [1] Tetrahedron, 2010, vol. 66, # 46, p. 8904 - 8910 [2] Journal of the American Chemical Society, 2007, vol. 129, # 49, p. 15102 - 15103 [3] Organic and Biomolecular Chemistry, 2007, vol. 5, # 15, p. 2433 - 2440 [4] Journal of the American Chemical Society, 2004, vol. 126, # 34, p. 10526 - 10527 [5] Journal of the American Chemical Society, 2007, vol. 129, # 7, p. 1921 - 1930 [6] Chemistry - A European Journal, 2015, vol. 21, # 5, p. 2241 - 2249 [7] Heteroatom Chemistry, 2003, vol. 14, # 4, p. 360 - 364 [8] European Journal of Medicinal Chemistry, 2017, vol. 126, p. 1034 - 1038 [9] Beilstein Journal of Organic Chemistry, 2014, vol. 10, p. 2071 - 2076 [10] Patent: EP2351761, 2011, A1. Location in patent: Page/Page column 22-23 [11] Patent: JP5812764, 2015, B2. Location in patent: Paragraph 0100 [12] Tetrahedron, 2007, vol. 63, # 11, p. 2391 - 2403 [13] Journal of the Chemical Society - Perkin Transactions 1, 1998, # 13, p. 2023 - 2029 [14] Acta Chemica Scandinavica, Series B: Organic Chemistry and Biochemistry, 1982, vol. 36, # 2, p. 135 - 136 [15] Journal of Medicinal Chemistry, 1988, vol. 31, # 7, p. 1466 - 1471 [16] Tetrahedron, 1993, vol. 49, # 47, p. 10843 - 10854
合成路线 2(2. 合成:16932-44-8)
产率:93%
合成条件:With N-iodo-succinimide; palladium diacetate In N,N-dimethyl-formamide at 80℃; for 3 h; Inert atmosphere
实验步骤:一般步骤:将2,6-二甲氧基苯甲酸(0.1mmol),碘试剂,钯催化剂,溶剂(1.0mL)溶液加入到10mL反应容器中,进行氮气保护,加热反应,通过下式分析产物:GC-MS。 各对照组的具体反应条件如表1所示。
参考文献:
- [1] Journal of Organic Chemistry, 2016, vol. 81, # 7, p. 2794 - 2803 [2] Journal of the American Chemical Society, 2017, vol. 139, # 33, p. 11527 - 11536 [3] Patent: CN106748604, 2017, A. Location in patent: Paragraph 0039; 0040; 0097; 0098; 0099; 0100 [4] Patent: CN107325002, 2017, A. Location in patent: Paragraph 0133
合成路线 3(3. 合成:16932-44-8)
产率:99%
合成条件:With caesium tribromide In water; N,N-dimethyl-formamide at 80℃; for 3.30 h;
实验步骤:通用方法:向三氟硼酸盐(1mmol)的3mL DMF水溶液(2:1v / v)溶液中加入三碘化铯(1mmol)。 将混合物在80℃下搅拌适当的时间(表3),然后用10mL乙醚稀释。 将水层用乙醚(5mL)萃取两次,并将合并的有机相用无水Na 2 SO 4干燥。 蒸发溶剂后,残余物通过硅胶柱色谱法纯化[洗脱液:己烷(或戊烷) - 乙酸乙酯(或Et 2 O)]。
参考文献:
- [1] Tetrahedron, 2012, vol. 68, # 19, p. 3738 - 3743