3-difluoromethyl-1,5-diphenyl-1H-pyrazole

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 3-difluoromethyl-1,5-diphenyl-1H-pyrazole
• 英文别名: 1,5-Diphenyl-3-(difluoromethyl)-1H-pyrazole；3-(difluoromethyl)-1,5-diphenylpyrazole
• 化学式: C₁₆H₁₂F₂N₂
• 分子量: 270.281
• InChiKey: MFWVYQBSVJBUFT-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.2
• 重原子数：
  20
• 可旋转键数：
  3
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.06
• 拓扑面积：
  17.8
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  3-difluoromethyl-1,5-diphenyl-1H-pyrazole 、 丙烯酸丁酯 在 palladium diacetate 、 silver carbonate 、 对苯醌 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 24.0h， 以29%的产率得到(E)-butyl 3-(3-(difluoromethyl)-1,5-diphenyl-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：

  1-(1-phenylvinyl)tetrahydro-1H-thiophen-1-ium tetraphenylborate 、 2,2-difluoro-N-phenylacetohydrazonoylbromide 在 potassium carbonate 作用下， 以 丙酮 为溶剂， 以85 %的产率得到3-difluoromethyl-1,5-diphenyl-1H-pyrazole
  参考文献：
  名称：

  乙烯基锍盐与腙酰卤的[3 + 2]环加成反应：吡唑的合成

  摘要：

  开发了由腙酰卤和乙烯基锍盐原位生成的腈亚胺之间的有效[3 + 2]环加成反应。腈亚胺被证明是乙烯基锍盐进行[3 + 2]环加成反应的一类新型反应伙伴。该工艺为反应条件温和、底物范围广、产物收率好、区域选择性高的吡唑衍生物的构建提供了一种简洁高效的方法。

  DOI：

  10.1021/acs.joc.4c00910

文献信息

• New hydroxy-pyrazoline intermediates, subtle regio-selectivity and relative reaction rate variations observed during acid catalyzed and neutral pyrazole cyclization
  作者：Timothy Norris、Roberto Colon-Cruz、David H. B. Ripin

  DOI：10.1039/b500413f

  日期：——

  capability of the R and Ar substituents. The reaction conditions that caused cyclization to pyrazoles varied from direct condensation of the hydrazine and 1,3-dicarbonyl compounds, to reactions requiring catalytic quantities of sulfuric acid to sulfuric acid in excess. Unexpected regio-selectivity was observed in the case of R = CF3 that depended upon the reaction conditions.

  芳肼4和1,3-二羰基化合物5通过via异构体对6和7失水而反应生成吡唑，这会产生两种可能的区域异构体。有时观察到3-羟基-3,4-二氢吡唑或羟基吡唑啉9和9是稳定的可分离中间体，可以在失去第二分子水生成吡唑10和11之前对其进行充分表征。类型8和9的中间体相对较少。我们研究了其中R = CH3，CHF2和CF3，Ar = Ph和5-甲磺酰基吡啶-2--2-基的反应系列（方案2），并观察了动力学行为和区域异构现象之间的性质差异，具体取决于电子的程度。 R和Ar取代基的吸收能力。导致环化成吡唑的反应条件从肼和1,3-二羰基化合物的直接缩合到需要催化量的硫酸到过量硫酸的反应之间变化。在R ＝ CF 3的情况下，观察到区域选择性超出预期，这取决于反应条件。
• Compositions of a cyclooxygenase-2 selective inhibitor and phosphodiesterase inhibitor for the treatment of ischemic mediated central nervous system disorders or injury
  申请人：Stephenson T. Diane

  公开号：US20050130971A1

  公开（公告）日：2005-06-16

  The present invention provides compositions and methods for the treatment of central nervous system disorders. In some aspects, the invention provides a combination therapy for the treatment of a central nervous system ischemic mediated disorder comprising the administration to a subject of a PDE inhibitor in combination with a cyclooxygenase-2 selective inhibitor.

  本发明提供了治疗中枢神经系统疾病的组合物和方法。在某些方面，本发明提供了一种用于治疗中枢神经系统缺血介导的疾病的组合疗法，该疗法包括向受试者施用 PDE 抑制剂与环氧合酶-2 选择性抑制剂。
• 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.
• 10.1021/acs.joc.4c00910
  作者：Luo, Wen-Jing、Liang, Xiuwen、Chen, Maizhuo、Wang, Ke-Hu、Huang, Danfeng、Wang, Junjiao、Chen, Dong-Ping、Hu, Yulai

  DOI：10.1021/acs.joc.4c00910

  日期：——

  [3 + 2] cycloaddition reaction between in situ generated nitrile imines from hydrazonoyl halides and vinylsulfonium salts is developed. The nitrile imines are demonstrated to be a new class of reaction partner for vinylsulfonium salts to conduct the [3 + 2] cycloaddition reaction. The process provides a concise and efficient method for the construction of pyrazole derivatives under mild reaction conditions

  开发了由腙酰卤和乙烯基锍盐原位生成的腈亚胺之间的有效[3 + 2]环加成反应。腈亚胺被证明是乙烯基锍盐进行[3 + 2]环加成反应的一类新型反应伙伴。该工艺为反应条件温和、底物范围广、产物收率好、区域选择性高的吡唑衍生物的构建提供了一种简洁高效的方法。