1-(2-fluorophenyl)-4-methyl-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylic acid ethyl ester | 501426-52-4

• 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-(2-fluorophenyl)-4-methyl-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylic acid ethyl ester
• 英文别名: ethyl 1-(2-fluorophenyl)-5-(4-methoxyphenyl)-4-methyl-1H-pyrazole-3-carboxylate；Ethyl 1-(2-fluorophenyl)-5-(4-methoxyphenyl)-4-methylpyrazole-3-carboxylate
• CAS: 501426-52-4
• 化学式: C₂₀H₁₉FN₂O₃
• 分子量: 354.381
• InChiKey: QXSNEIIDYJVAJC-UHFFFAOYSA-N

物化性质

• 熔点：
  86-88 °C
• 沸点：
  486.7±45.0 °C(Predicted)
• 密度：
  1.20±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  26
• 可旋转键数：
  6
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.2
• 拓扑面积：
  53.4
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  1-(2-fluorophenyl)-4-methyl-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylic acid ethyl ester 在 氢氧化钾 、 氯化亚砜 作用下， 以 甲醇 、 甲苯 为溶剂， 生成
  参考文献：
  名称：

  Synthesis, Structure−Activity Relationship, and Evaluation of SR141716 Analogues:  Development of Central Cannabinoid Receptor Ligands with Lower Lipophilicity

  摘要：

  Exploration of the central CB1 cannabinoid receptors using positron emission tomography (PET) will allow for an understanding of the pharmacological and physiological role played by these receptors in the CNS. Current tracers are highly lipophilic compounds that exhibit very high nonspecific to specific binding ratios and as a result are inapt for use in humans. We have synthesized a series of less lipophilic analogues of SR141716 to serve as potential radioligands. Binding affinities of the series and a functional electrophysiological assay of three of our compounds have been presented.

  DOI：

  10.1021/jm020157x
• 作为产物：
  描述：

  对甲氧基苯丙酮 在 四氯化钛 、 magnesium sulfate 、 N,N-二异丙基乙胺 作用下， 以 乙醇 、 甲苯 为溶剂， 生成 1-(2-fluorophenyl)-4-methyl-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylic acid ethyl ester
  参考文献：
  名称：

  N-(4-Cyanotetrahydro-2H-pyran-4-yl) and N-(1-Cyanocyclohexyl) Derivatives of 1,5-Diarylpyrazole-3-carboxamides Showing High Affinity for 18 kDa Translocator Protein and/or Cannabinoid Receptors

  摘要：

  In order to develop improved radioligands for imaging brain CB(1) receptors with positron emission tomography (PET) based on rimonabant (5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-N-(piperidin-1-yl)-1H-pyrazole-3-carboxamide, 1), we synthesized compounds 9a-s in which the N-piperidinyl ring was replaced with a 4-(4-cyanotetrahydro-2H-pyranyl) or 1-cyanocyclohexyl ring. Such changes were expected to be almost isosteric with 1, confer greater metabolic resistance, and in the case of the 4-(4-cyanotetrahydro-2H-pyranyl) compounds, substantially reduce lipophilicity. One derivative, 1-(2-bromophenyl)-N-(1-cyanocyclohexyl)-5-(4-methoxyphenyl)-4-methylpyrazole-3-carboxamide (9n), showed high affinity (K(i) = 15.7 nM) and selectivity for binding to CB(1) receptors. The corresponding 4-(4-cyanotetrahydro-2H-pyranyl) derivative (9m) also showed quite high affinity for CB(1) receptors (K(i) = 62 nM) but was found to have even higher affinity (K(i) = 29 nM) for the structurally unrelated 18 kDa translocator protein (TSPO). Some other minor structural changes among 9a-s were also found to switch binding selectivity from CB(1) receptors to TSPO or vice versa. These unexpected findings and their implications for the development of selective ligands or PET radioligands for CB(1) receptors or TSPO are discussed in relation to current pharmacophore models of CB(1) receptor and TSPO binding sites.

  DOI：

  10.1021/jm2000536