1-(p-nitrophenyl)-5-(p-methoxyphenyl)-3-trifluoromethylpyrazole

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 1-(p-nitrophenyl)-5-(p-methoxyphenyl)-3-trifluoromethylpyrazole
• 英文别名: 5-(4-Methoxyphenyl)-1-(4-nitrophenyl)-3-(trifluoromethyl)pyrazole
• 化学式: C₁₇H₁₂F₃N₃O₃
• 分子量: 363.296
• InChiKey: COCAAVKABWMIAF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.3
• 重原子数：
  26
• 可旋转键数：
  3
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.12
• 拓扑面积：
  72.9
• 氢给体数：
  0
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  1-(p-nitrophenyl)-5-(p-methoxyphenyl)-3-trifluoromethylpyrazole 、 丙烯酸丁酯 在 palladium diacetate 、 silver carbonate 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 24.0h， 以82%的产率得到(E)-butyl 3-(5-(4-methoxyphenyl)-1-(4-nitrophenyl)-3-(trifluoromethyl)-1H-pyrazol-4-yl)acrylate
  参考文献：
  名称：

  A new and direct route to 3-fluoromethyl substituted pyrazol-4-acrylates via Pd-catalyzed C–H activation

  摘要：

  Direct C4-H activation of 3-fluoromethyl pyrazoles followed by an oxidative coupling with acrylates, which is perhaps the most direct method for the synthesis of 3-fluoromethyl substituted pyrazol-4-aciylates of biological interest, remains challenging. Here, the first example of the straightforward olefination via Pd-catalyzed C4-H activation of both C3-CF3 and C3-CF2H substituted pyrazoles is reported. The reaction of various C3-CF3 substituted pyrazoles with acrylates proceeds smoothly in the presence of Pd(OAc)(2) and Ag2CO3, whereas olefination of C3-CF2H substituted pyrazoles requires the addition of benzoquinone. A further computational study reveals that reactivity of the pyrazolyl substrates employed are strongly impacted by the substituents of different nature on their C1 or C5 position, which is in good agreement with the experimental data. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2013.06.058
• 作为产物：
  描述：

  4,4,4-三氟-1-(4-甲氧基苯基)-1,3-丁烷二酮 、 4-硝基苯肼 以 乙醇 为溶剂， 反应 8.0h， 以22%的产率得到1-(p-nitrophenyl)-5-(p-methoxyphenyl)-3-trifluoromethylpyrazole
  参考文献：
  名称：

  芳基和杂芳基肼与芳基三氟甲基β-二酮的反应

  摘要：

  我们报告了当五个芳香族或杂芳香族肼与六个带有三氟甲基和芳基取代基的β-二酮反应时获得的结果。四十二个化合物已被分离出对应于两个同分异构的三氟甲基吡唑和中间体5-CF 3，5-OH吡唑啉。该结果为建立吡唑的合成机理提供了有用的信息。

  DOI：

  10.1002/jhet.5570430428

文献信息

• Synthesis of 1,3,5-Trisubstituted [4-<i>tert</i>-Butyl 2-(5,5-difluoro-2,2-dimethyl-6-vinyl-1,3-dioxan-4-yl)acetate]pyrazoles via a Pd-Catalyzed CH Activation
  作者：Xiaoguang Wang、Xiang Fang、Xueyan Yang、Meng Ni、Fanhong Wu

  DOI：10.1002/cjoc.201201100

  日期：2012.12

  The gem‐difluoromethylenated acetonide 2 was efficiently synthesized as new precursor of HMG‐CoA reductase inhibitor. Straightforward olefination via Pd‐catalyzed C4‐H activation of 1,3,5‐trisubstituted pyrazoles 1 was proceeded smoothly in the presence of Pd(OAc)2 and AgCO3. This protocol has merits in terms of the improved atomic economy and prevention from the generation of by‐products.

  所述宝石-difluoromethylenated丙酮化合物2作为HMG-CoA还原酶抑制剂的新的前体有效地合成。在Pd（OAc）2和AgCO 3的存在下，通过Pd催化的1,3,5-三取代的吡唑1的C 4 -H活化的直链烯烃化反应顺利进行。该协议在改善原子经济和防止副产物生成方面具有优势。
• The reaction of aryl and heteroarylhydrazines with aryl-trifluoromethyl β-diketones
  作者：Shiv P. Singh、Vinod Kumar、Ranjana Aggarwal、Jose Elguero

  DOI：10.1002/jhet.5570430428

  日期：2006.7

  We report the results obtained when five aromatic or heteroaromatic hydrazines react with six β-diketones bearing trifluoromethyl and aryl substituents. Forty-two compounds have been isolated corresponding to two isomeric trifluoromethyl pyrazoles and the intermediate 5-CF3, 5-OH pyrazolines. The results have provided useful information for establishing the mechanism of the synthesis of pyrazoles.

  我们报告了当五个芳香族或杂芳香族肼与六个带有三氟甲基和芳基取代基的β-二酮反应时获得的结果。四十二个化合物已被分离出对应于两个同分异构的三氟甲基吡唑和中间体5-CF 3，5-OH吡唑啉。该结果为建立吡唑的合成机理提供了有用的信息。
• A new and direct route to 3-fluoromethyl substituted pyrazol-4-acrylates via Pd-catalyzed C–H activation
  作者：Xiaoguang Wang、Xiang Fang、Hongyuan Xiao、Dongming Gong、Xueyan Yang、Fanhong Wu

  DOI：10.1016/j.tet.2013.06.058

  日期：2013.8

  Direct C4-H activation of 3-fluoromethyl pyrazoles followed by an oxidative coupling with acrylates, which is perhaps the most direct method for the synthesis of 3-fluoromethyl substituted pyrazol-4-aciylates of biological interest, remains challenging. Here, the first example of the straightforward olefination via Pd-catalyzed C4-H activation of both C3-CF3 and C3-CF2H substituted pyrazoles is reported. The reaction of various C3-CF3 substituted pyrazoles with acrylates proceeds smoothly in the presence of Pd(OAc)(2) and Ag2CO3, whereas olefination of C3-CF2H substituted pyrazoles requires the addition of benzoquinone. A further computational study reveals that reactivity of the pyrazolyl substrates employed are strongly impacted by the substituents of different nature on their C1 or C5 position, which is in good agreement with the experimental data. (C) 2013 Elsevier Ltd. All rights reserved.