O-acetoacetylTEMPO | 878494-37-2

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 酮酸及其衍生物
• 英文名称: O-acetoacetylTEMPO
• 英文别名: (2,2,6,6-Tetramethylpiperidin-1-yl) 3-oxobutanoate
• CAS: 878494-37-2
• 化学式: C₁₃H₂₃NO₃
• 分子量: 241.331
• InChiKey: RSDWSWPHNSWYTI-UHFFFAOYSA-N

物化性质

• 沸点：
  98-99 °C(Press: 0.06 Torr)
• 密度：
  1.03±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.3
• 重原子数：
  17
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.85
• 拓扑面积：
  46.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  O-acetoacetylTEMPO 在 哌啶 、 溶剂黄146 作用下， 以 二氯甲烷 为溶剂， 生成 3-Oxo-2-[1-pyridin-3-yl-meth-(E)-ylidene]-butyric acid 2,2,6,6-tetramethyl-piperidin-1-yl ester
  参考文献：
  名称：

  E- or Z-Selective Knoevenagel Condensation of Acetoacetic Derivatives:  Effect of Acylated Substituent, that is, TEMPO and Amines, as an Auxiliary, and New Accesses to Trisubstituted E- and Z-2-Alkenals and Furans

  摘要：

  Knoevenagel condensation of O-acetoacetylTEMPOs (2,2,6,6-tetramethylpiperidine-1-oxyl) with aldehydes substituted with an electron-withdrawing group such as aromatic and heteroaromatic ones leads preferentially to E-adducts, while acylacetoamides including Weinreb amides produce Z-adducts, exclusively. These E- and Z-adducts are selectively converted to the corresponding (2E)- and (2Z)-2hyroxyalkyl-2-alkenals, respectively, by stepwise reductions of the acyl group with DIBALH and then the carboxylic functions after protection of the hydroxy group. Transformation of the Knoevenagel products by taking advantage of the E-geometry to trisubstituted furans is also developed.

  DOI：

  10.1021/jo051952w
• 作为产物：
  描述：

  乙酸异丙烯酯 、 1-acetoxy-2,2,6,6-tetramethylpiperidine 在 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 正己烷 为溶剂， 反应 5.33h， 以49%的产率得到O-acetoacetylTEMPO
  参考文献：
  名称：

  E- or Z-Selective Knoevenagel Condensation of Acetoacetic Derivatives:  Effect of Acylated Substituent, that is, TEMPO and Amines, as an Auxiliary, and New Accesses to Trisubstituted E- and Z-2-Alkenals and Furans

  摘要：

  Knoevenagel condensation of O-acetoacetylTEMPOs (2,2,6,6-tetramethylpiperidine-1-oxyl) with aldehydes substituted with an electron-withdrawing group such as aromatic and heteroaromatic ones leads preferentially to E-adducts, while acylacetoamides including Weinreb amides produce Z-adducts, exclusively. These E- and Z-adducts are selectively converted to the corresponding (2E)- and (2Z)-2hyroxyalkyl-2-alkenals, respectively, by stepwise reductions of the acyl group with DIBALH and then the carboxylic functions after protection of the hydroxy group. Transformation of the Knoevenagel products by taking advantage of the E-geometry to trisubstituted furans is also developed.

  DOI：

  10.1021/jo051952w

文献信息

• Substituent-Controlled Electrocyclization of 2,4-Dienones: Synthesis of 2,3,6-Trisubstituted 2H-Pyran-5-carboxylates and Their Transformations
  作者：Wei Peng、Toshiaki Hirabaru、Hiroyuki Kawafuchi、Tsutomu Inokuchi

  DOI：10.1002/ejoc.201100780

  日期：2011.10

  A facile access to 2,3,6-trisubstituted 2H-pyran-5-carboxylates is developed by employing 2-alkyl-2-enals as reactants with acetoacetates. The reaction involves Knoevenagel condensation followed by a 6π-electrocyclization, in which the presence of the C2 alkyl substituent in the enals favors the formation of (E)-Knoevenagel adducts for the ensuing electrocyclization. The resulting 2H-pyrans are hydrogenated

  通过使用 2-烷基-2-烯醛作为与乙酰乙酸酯的反应物，可以轻松获得 2,3,6-三取代的 2H-吡喃-5-羧酸酯。该反应涉及 Knoevenagel 缩合，然后是 6π-电环化，其中烯醛中 C2 烷基取代基的存在有利于形成 (E)-Knoevenagel 加合物，用于随后的电环化。所得的 2H-吡喃被氢化形成 3,4-二氢-2H-吡喃并通过单线态氧环加成转化为内过氧化物。
• <i>E</i>- or <i>Z</i>-Selective Knoevenagel Condensation of Acetoacetic Derivatives:  Effect of Acylated Substituent, that is, TEMPO and Amines, as an Auxiliary, and New Accesses to Trisubstituted <i>E</i>- and <i>Z</i>-2-Alkenals and Furans
  作者：Tsutomu Inokuchi、Hiroyuki Kawafuchi

  DOI：10.1021/jo051952w

  日期：2006.2.1

  Knoevenagel condensation of O-acetoacetylTEMPOs (2,2,6,6-tetramethylpiperidine-1-oxyl) with aldehydes substituted with an electron-withdrawing group such as aromatic and heteroaromatic ones leads preferentially to E-adducts, while acylacetoamides including Weinreb amides produce Z-adducts, exclusively. These E- and Z-adducts are selectively converted to the corresponding (2E)- and (2Z)-2hyroxyalkyl-2-alkenals, respectively, by stepwise reductions of the acyl group with DIBALH and then the carboxylic functions after protection of the hydroxy group. Transformation of the Knoevenagel products by taking advantage of the E-geometry to trisubstituted furans is also developed.