(R)-N-methylpiperidin-4-yl 2-cyclohexyl-2-hydroxyphenylacetate

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 哌啶类
• 英文名称: (R)-N-methylpiperidin-4-yl 2-cyclohexyl-2-hydroxyphenylacetate
• 英文别名: (1-methylpiperidin-4-yl) (2R)-2-cyclohexyl-2-hydroxy-2-phenylacetate
• 化学式: C₂₀H₂₉NO₃
• 分子量: 331.455
• InChiKey: QZPMHVOJMAXMND-FQEVSTJZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.9
• 重原子数：
  24
• 可旋转键数：
  5
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.65
• 拓扑面积：
  49.8
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  D-扁桃酸 在 palladium on activated charcoal 氢氧化钾 、 硫酸 、 氢气 、 sodium hydride 、 对甲苯磺酸 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲醇 、 乙醚 、 正戊烷 为溶剂， -80.0~25.0 ℃ 、500.0 kPa 条件下， 反应 27.75h， 生成 (R)-N-methylpiperidin-4-yl 2-cyclohexyl-2-hydroxyphenylacetate
  参考文献：
  名称：

  Stereoselective Synthesis and Biodistribution of Potent [¹¹C]-Labeled Antagonists for Positron Emission Tomography Imaging of Muscarinic Receptors in the Airways

  摘要：

  Quantitation of muscarinic receptors in the lungs in vivo with positron emission tomography (PET) is of clinical interest. For that purpose we decided to develop [C-11]-labeled ligands with a high affinity (K-D < 0.1 nM). Three quaternary muscarinic antagonists, racemic N-methylpiperidin-4-yl 2-cyclohexy-2-2-hydroxy-2-phenylacetate methiodide 1a (pK(B) = 10.39), its (R)-isomer 1b (pK(B) = 11.08), and (R,R)-quinuclidin-3-yl 2-cyclohexyl-2-hydroxy-2-phenylacetate methiodide 2 (pK(B) = 11.28), were labeled by reacting [C-11]CH3I With their tertiary amine precursors. The enantiomerically pure tertiary amine precursors were prepared by stereoselective synthesis starting from (R)-(-)-mandelic acid. In vitro binding assay of 1b and 2 demonstrated that both ligands bind with very high affinity to the muscarinic receptor subtypes M(1), M(2), and M(3). They are more potent than the muscarinic antagonist (R)-N-methylquinuclidinyl benzilate ((R)-MQNB). Distribution studies with la, 1b, and 2 in control and atropine-treated male Wistar rats demonstrated significant specific binding (90-99% of total issue uptake) in tissues containing cholinoceptors (heart, intestine, lung, pancreas, spleen, stomach, submandibular gland). Because the tissue/plasma concentration ratios of 1b are most favorable, this ligand was used for further evaluation. Analysis of plasma samples showed a very rapid clearance (t(1/2) = 0.3 min) of the radioligand 1b and a relatively slow appearance of a hydrophilic metabolite. At 15 min postinjection of 1b, analysis of heart, lungs, and liver showed that respectively 99%, 88%, and 8% of the tissue radioactivity corresponded with the parent compound. Ligand 1b appears to be an excellent candidate for PET studies of mAChR receptors in heart and lungs.

  DOI：

  10.1021/jm960374w