Pd(dppf)Cl2催化Suzuki偶联反应合成4-(4-叔丁基苯基)-6-甲基-1,2,3,5-四氢-s-引达省
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TQ241.3; O625.13

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上海市科委科技计划资助项目(13XD1421700)


Synthesis of 4-(4-tert-Butylphenyl)-6-methyl-1,2,3,5-tetrahydro-s-indacene by Pd(dppf)Cl2 Catalyzed Suzuki-Miyaura Cross Coupling Reaction
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    摘要:

    以Pd(dppf)Cl2为催化剂催化Suzuki偶联反应合成了一种在烯烃聚合中有重要作用的茂金属催化剂配体——4-(4-叔丁基苯基)-6-甲基-1,2,3,5-四氢-s-引达省(III),其结构经1H NMR,IR,GC-MS和MS进行了表征。考察了催化剂、添加剂、溶剂的种类及其与反应物的配比等因素对反应的影响,以底物4-溴-6甲基-1,2,3,5-四氢-s-引达省计,得到的最佳合成工艺条件为:1.5 mol% Pd(dppf)Cl2,4-叔丁基苯硼酸1.1 mol/mol,无水碳酸钾1.5 mol/mol,异丙醇1000 mL/mol,回流至溴代茚底物转化保持恒定(约需26 h),III的收率为82.1%,GC纯度99%。探索出一种以溴代茚类化合物为底物合成联芳基茚类化合物的方法,有效控制了合成过程中“双键移位”副产物的产生。

    Abstract:

    4-((4-tert-Butyl) phenyl)-6-methyl-1,2,3,5-tetrahydro-s-indacene (III), an important ligand to prepare metallocene catalysts for olefin polymerization, was synthesized by Suzuki-Miyaura cross-coupling reaction catalyzed by Pd(dppf)Cl2 . The structure of the product was confirmed by 1H NMR, IR, GC-MS and MS. The effects of the kinds of catalysts, solvents, and bases on the reaction were studied in detail. Calculated on the base of 4-bromo-6-methyl- 1,2,3,5- tetrahydro-s-indacene, the optimized conditions were determined as follows: In the presence of 1.5 mol% of Pd(dppf)Cl2, 1.1 mol/mol of 4-tert-butylphenyl boronic acid, 1.5 mol/mol of K2CO3 and 1000 mL/mol of i-PrOH, the reaction mixture was stirred under reflux until reaching stable conversion of the bromoindene (ca. 26 h needed), the yield of III was 82.1%, and the purity was 99%. According to this practical method, bromide indene was successfully used as an intermediate to prepare aryl substituted indene,and the forming of indene double bond isomers was effectively inhibited in the present system.

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李永清,曹育才,周慧. Pd(dppf)Cl2催化Suzuki偶联反应合成4-(4-叔丁基苯基)-6-甲基-1,2,3,5-四氢-s-引达省[J].精细化工,2014,31(2):

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  • 收稿日期:2013-08-01
  • 最后修改日期:2013-10-31
  • 录用日期:2013-11-01
  • 在线发布日期: 2014-02-08
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