ethyl 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate | 1196054-51-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: ethyl 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate
• 英文别名: Ethyl 4-cyano-1-(2-iodophenyl)-5-(4-methoxyphenyl)pyrazole-3-carboxylate
• CAS: 1196054-51-9
• 化学式: C₂₀H₁₆IN₃O₃
• 分子量: 473.27
• InChiKey: RUXCJKVHXLMQQL-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.4
• 重原子数：
  27
• 可旋转键数：
  6
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.15
• 拓扑面积：
  77.1
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  ethyl 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate 在 lithium hydroxide 、 盐酸 作用下， 以 四氢呋喃 、 水 为溶剂， 生成
  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
• 作为产物：
  描述：

  2-碘苯胺 在 盐酸 、 N,N-二异丙基乙胺 作用下， 以 水 、 乙腈 为溶剂， 反应 16.0h， 生成 ethyl 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate
  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

文献信息

• Synthesis and in vitro autoradiographic evaluation of a novel high-affinity radioiodinated ligand for imaging brain cannabinoid subtype-1 receptors
  作者：Sean R. Donohue、Katarina Varnäs、Zhisheng Jia、Balázs Gulyás、Victor W. Pike、Christer Halldin

  DOI：10.1016/j.bmcl.2009.08.092

  日期：2009.11

  There is strong interest to study the involvement of brain cannabinoid subtype-1 (CB1) receptors in neuropsychiatric disorders with single photon emission computed tomography ( SPECT) and a suitable radioligand. Here we report the synthesis of a novel high-affinity radioiodinated CB1 receptor ligand ([I-125]8, [I-125]1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-N-(piperidin-1-yl)-1H-pyrazole-3-carboxylate, [I-125] SD7015). By autoradiography in vitro, [I-125]8 showed selective binding to CB1 receptors on human brain postmortem cryosections and now merits labeling with iodine-123 for further evaluation as a SPECT radioligand in non-human primate. (c) 2009 Elsevier Ltd. All rights reserved.
• [EN] RADIOTRACERS FOR IMAGING CANNABINOID SUB-TYPE1 (CB1) RECEPTOR<br/>[FR] TRACEURS RADIOACTIFS POUR L'IMAGERIE DES RÉCEPTEURS CANNABINOÏDES  DE SOUS-TYPE 1 (CB1)
  申请人：US GOV HEALTH & HUMAN SERV

  公开号：WO2009140210A2

  公开（公告）日：2009-11-19

  Imaging of cannabinoid subtype-1 (CB1) receptors in vivo is important for understanding their role in neuropsychiatric disorders and for drug development. Radioligands for imaging with PET or SPECT are required for this purpose. The present invention provides new ligands, including (-)-3-(4-chlorophenyl)-N'-[(4-cyanophenyl)sulfonyl]-4-phenyl-4,5-dihydro-1H-pyrazole-1-carboxamidine) and 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-N-(piperidin-1-yl)-1H-pyrazole-3-carboxylate, which were found to have high affinity and selectivity for binding to CB1 receptors. These compounds were labeled and evaluated as a PET and SPECT radioligands for use in mammals. After injection of [11C] (-)-3-(4-chlorophenyl)-N'-[(4-cyanophenyl)sulfonyl]-4-phenyl-4,5-dihydro-1H-pyrazole-1-carboxamidine) into mammals, high uptake and retention of radioactivity across brain according to the rank order of CB1 receptor densities was observed. Likewise 125I-labeled 1-(2-iodophenyl)-4-cyano-5-(4-methoxyphenyl)-N-(piperidin-1-yl)-1H-pyrazole-3-carboxylate showed a distinct regional distribution of radioactivity in brain tissue according to the known CB1 receptor densities. Ligands of the present invention are useful for in vivo imaging CB1 receptor function in mammals.