2-benzyloctahydropyrido<1,2-a>pyrazin-6-one | 146367-30-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 哌嗪基哌啶类
• 英文名称: 2-benzyloctahydropyrido<1,2-a>pyrazin-6-one
• 英文别名: 2-benzyl-3,4,7,8,9,9a-hexahydro-1H-pyrido[1,2-a]pyrazin-6-one
• CAS: 146367-30-8
• 化学式: C₁₅H₂₀N₂O
• 分子量: 244.337
• InChiKey: ZKDDKECZFCHLDZ-UHFFFAOYSA-N

物化性质

• 沸点：
  388.9±31.0 °C(Predicted)
• 密度：
  1.15±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  18
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.53
• 拓扑面积：
  23.6
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2-benzyloctahydropyrido<1,2-a>pyrazin-6-one 在 lithium aluminium tetrahydride 、 氢溴酸 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 1.08h， 生成 2-benzyl-7-(diphenylmethylene)octahydro-2H-pyrido<1,2-a>pyrazine
  参考文献：
  名称：

  Synthesis and 2,7-functionalization of the bicyclic lactam 2-benzyloctahydropyrido[1,2-a]pyrazin-6-one

  摘要：

  This report describes the synthesis of the title compound 7 and its conversion into 2,7-substituted octahydro-2H-pyrido[1,2-a]pyrazines, i.e., bicyclic analogues of the monocyclic piperazine drug lidoflazine. The synthesis of 7 is based on a 3-fold amino substitution of methyl 6-chlor-5-oxohexanoate (12), initiated by displacement of chlorine with N-benzyl-N'-trityl-1,2-ethanediamine. The required trielectrophile 12 was prepared readily from commercially available diethyl 2-acetyl-glutarate. The 7-position of compound 7 was functionalized through reaction of the lactam anion with benzophenone electrophiles. Further elaboration into the target compounds 8-10 involved dehydration, reduction of the lactam group, and different modes of N-debenzylation. Conformational aspects for lactam compounds 17 and 18 and the modes of ring fusion for the diastereomeric amines 9 and 10 were examined by using proton NMR and infrared spectroscopy.

  DOI：

  10.1021/jo00055a023
• 作为产物：
  描述：

  在 盐酸 、 sodium cyanoborohydride 作用下， 生成 2-benzyloctahydropyrido<1,2-a>pyrazin-6-one
  参考文献：
  名称：

  Synthesis and 2,7-functionalization of the bicyclic lactam 2-benzyloctahydropyrido[1,2-a]pyrazin-6-one

  摘要：

  This report describes the synthesis of the title compound 7 and its conversion into 2,7-substituted octahydro-2H-pyrido[1,2-a]pyrazines, i.e., bicyclic analogues of the monocyclic piperazine drug lidoflazine. The synthesis of 7 is based on a 3-fold amino substitution of methyl 6-chlor-5-oxohexanoate (12), initiated by displacement of chlorine with N-benzyl-N'-trityl-1,2-ethanediamine. The required trielectrophile 12 was prepared readily from commercially available diethyl 2-acetyl-glutarate. The 7-position of compound 7 was functionalized through reaction of the lactam anion with benzophenone electrophiles. Further elaboration into the target compounds 8-10 involved dehydration, reduction of the lactam group, and different modes of N-debenzylation. Conformational aspects for lactam compounds 17 and 18 and the modes of ring fusion for the diastereomeric amines 9 and 10 were examined by using proton NMR and infrared spectroscopy.

  DOI：

  10.1021/jo00055a023