[2-Allyl-cyclopent-(E)-ylidene]-isobutyl-amine | 137496-60-7

• 英文名称: [2-Allyl-cyclopent-(E)-ylidene]-isobutyl-amine
• 英文别名: N-(2-methylpropyl)-2-prop-2-enylcyclopentan-1-imine
• CAS: 137496-60-7
• 化学式: C₁₂H₂₁N
• 分子量: 179.305
• InChiKey: CWMWNBSWWRNWNR-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3
• 重原子数：
  13
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  12.4
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  [2-Allyl-cyclopent-(E)-ylidene]-isobutyl-amine 在 lithium aluminium tetrahydride 作用下， 生成 (2-Allyl-cyclopentyl)-isobutyl-amine
  参考文献：
  名称：

  Lewis acid-promoted 3-aza-Cope rearrangement of N-alkyl-N-allyl enamines

  摘要：

  The 3-aza-Cope rearrangement of the N-alkyl-N-allylenamines derived from isobutyraldehyde, which proceeds thermally at 250-degrees-C, has been accelerated by a variety of electrophilic reagents to give gamma,delta-unsaturated imines. Protic acids, such as HCl (0.5 equiv), and the Lewis acidic reagents TiCl4 (0.1-0.2 equiv), Et2O.BF3 (0.5 equiv), and AlMe3 (1.0 equiv) produced complete [3,3] rearrangement of substrates at 111-degrees-C. By increasing the Lewis acidity of the aluminum reagents, this transformation was achieved at 50-degrees-C with ClAlMe2, Cl2AlMe, and methylaluminum bis(2,6-diphenylphenoxide). Reaction conditions were studied initially by GLC analysis of the N-isobutyl derivative. These optimum conditions were then used to obtain isolated yields of 59-99% for rearrangement and in situ LiAlH4 reduction of the analogous N-methylcyclohexyl substrate to the corresponding delta,epsilon-unsaturated amine. Substrates derived from 2-phenylpropanal, n-butanal, cyclohexanone, and cyclopentanone were used to examine the general effectiveness of HCl, TiCl4, and AlMe3 as reagents for acceleration of the [3,3] rearrangement. The most versatile and efficient reagent for promoting this reaction, AlMe3, produced overall yields of 83-96% for the two-step rearrangement and reduction of these substrates.

  DOI：

  10.1021/jo00028a016
• 作为产物：
  描述：

  Allyl-cyclopent-1-enyl-isobutyl-amine 在 三甲基铝 作用下， 以 甲苯 为溶剂， 生成 [2-Allyl-cyclopent-(E)-ylidene]-isobutyl-amine
  参考文献：
  名称：

  Lewis acid-promoted 3-aza-Cope rearrangement of N-alkyl-N-allyl enamines

  摘要：

  The 3-aza-Cope rearrangement of the N-alkyl-N-allylenamines derived from isobutyraldehyde, which proceeds thermally at 250-degrees-C, has been accelerated by a variety of electrophilic reagents to give gamma,delta-unsaturated imines. Protic acids, such as HCl (0.5 equiv), and the Lewis acidic reagents TiCl4 (0.1-0.2 equiv), Et2O.BF3 (0.5 equiv), and AlMe3 (1.0 equiv) produced complete [3,3] rearrangement of substrates at 111-degrees-C. By increasing the Lewis acidity of the aluminum reagents, this transformation was achieved at 50-degrees-C with ClAlMe2, Cl2AlMe, and methylaluminum bis(2,6-diphenylphenoxide). Reaction conditions were studied initially by GLC analysis of the N-isobutyl derivative. These optimum conditions were then used to obtain isolated yields of 59-99% for rearrangement and in situ LiAlH4 reduction of the analogous N-methylcyclohexyl substrate to the corresponding delta,epsilon-unsaturated amine. Substrates derived from 2-phenylpropanal, n-butanal, cyclohexanone, and cyclopentanone were used to examine the general effectiveness of HCl, TiCl4, and AlMe3 as reagents for acceleration of the [3,3] rearrangement. The most versatile and efficient reagent for promoting this reaction, AlMe3, produced overall yields of 83-96% for the two-step rearrangement and reduction of these substrates.

  DOI：

  10.1021/jo00028a016