| 1295503-43-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 异喹啉及其衍生物
• CAS: 1295503-43-3
• 化学式: C₁₈H₁₄N₂O₃
• 分子量: 306.321
• InChiKey: RRMBFKXNMHNFAV-HNNXBMFYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.22
• 重原子数：
  23.0
• 可旋转键数：
  1.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.17
• 拓扑面积：
  57.69
• 氢给体数：
  0.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  在 三乙胺 作用下， 以 乙醇 为溶剂， 生成 2-benzoyl-10,10a-dihydro-5H-imidazo[1,5-b]isoquinoline-1,3-dione
  参考文献：
  名称：

  Kinetics and mechanism of racemization of Tic-hydantoins, potent sigma-1 agonists

  摘要：

  The configurational stability of seven Tic-hydantoin sigma-1 agonists 1-7 was studied in organic and aqueous media to mimic conditions encountered during either their synthesis or their evaluation as a drug candidate (physico chemical property determination and pharmacological study). This study was performed from the enantiomers directly obtained by asymmetric synthesis (hydantoins 1,3-7) or after semi-preparative separation of the racemic obtained according to the same asymmetric procedure (thiohydantoin 2), by chiral HPLC. The racemization phenomenon was followed using recently validated chiral HPLC and capillary electrophoresis separation methods using derivatized cellulose and amylose chiral stationary phases (Chiralcel OD-H and Chiralpak AD) and highly sulphated cyclodextrins [highly S-beta-CD in the background electrolyte (BGE)], respectively. The kinetic parameters (rate constant, half-life and apparent free energy barriers) of racemization were calculated using a first-order reaction model. The influence of the acid-base content, pH in aqueous medium, concentration of the buffer, and temperature were investigated. The fastest racemization rates were observed under basic conditions. All hydantoins were shown to present the same magnitude of configurational stability, whereas thiohydantoin 2 was characterized by a high chiral instability, especially in ethanolic and aqueous media: its high instability in ethanol explains that a racemic mixture was obtained after asymmetric synthesis; its instantaneous racemization observed from the neutral pH makes the preparation of the enantiomers of 2 not relevant. Finally, the mechanism of racemization was elucidated using nuclear magnetic resonance (NMR): the comparison of the kinetics of the deuteration to the kinetics of the racemization suggests the involvement of a common reaction mechanism of S(E)1 type for hydantoin 1, while an S(E)2 type reaction seems to be involved for thiohydantoin 2. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2011.01.015