| 157731-52-7

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• CAS: 157731-52-7
• 化学式: C₁₂H₂₂O₂
• 分子量: 198.305
• InChiKey: WJQQGYNOHSSPLB-UHFFFAOYSA-N

物化性质

• 沸点：
  254.1±9.0 °C(Predicted)
• 密度：
  0.887±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.47
• 重原子数：
  14.0
• 可旋转键数：
  7.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  26.3
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为反应物：
  描述：

  在 正丁基锂 、 三苯基甲烷 、 三甲基铝 、 1,2-环氧辛烷 、 天然维生素E 作用下， 以 various solvent(s) 为溶剂， 反应 11.25h， 生成 (Z)-3-Butyl-5-ethylidene-4-propyl-2-cyclopenten-1-one
  参考文献：
  名称：

  Enynones in Organic Synthesis. 6. Synthesis of Spirocyclic Methylenecyclopentenones and Analogs of the Methylenomycin Class of Antibiotics. Mechanism of Phenol Catalysis

  摘要：

  Spirocyclic methylenecyclopentenones of general structure 18 were prepared in a single step from bis-acetylenic alcohols 29 by a process involving initial oxy-Cope rearrangement to afford (Z)-enynones 30-Z followed by electrocyclic ring closure. Mechanistic studies indicate that the initial step leading from 30-Z to 18 is a thermal 1,5-prototropic shift to afford dienols which can cyclize by a symmetry-allowed (pi(4)s + sigma(2)s + pi(2)a) process. This last step is catalyzed by certain phenols having low oxidation potentials, most likely by a mechanism involving single electron transfer. Dramatic rate enhancements were also observed for the cyclization of simple enynones 37 to methylenecyclopentenones 39 upon catalysis with either a-tocopherol (vitamin E, 40) or tert-butylcatechol(41). Further enhancements in both rate and yield were obtained under conditions of photoassisted single electron transfer (PET), which afforded 39 in yields of 80-98%.

  DOI：

  10.1021/jo00097a035
• 作为产物：
  描述：

  5-壬酮 、 三甲基膦酰基乙酸酯 在 六甲基磷酰三胺 、 正丁基锂 作用下， 以 乙醚 、 正己烷 为溶剂， 以78%的产率得到
  参考文献：
  名称：

  Enynones in Organic Synthesis. 6. Synthesis of Spirocyclic Methylenecyclopentenones and Analogs of the Methylenomycin Class of Antibiotics. Mechanism of Phenol Catalysis

  摘要：

  Spirocyclic methylenecyclopentenones of general structure 18 were prepared in a single step from bis-acetylenic alcohols 29 by a process involving initial oxy-Cope rearrangement to afford (Z)-enynones 30-Z followed by electrocyclic ring closure. Mechanistic studies indicate that the initial step leading from 30-Z to 18 is a thermal 1,5-prototropic shift to afford dienols which can cyclize by a symmetry-allowed (pi(4)s + sigma(2)s + pi(2)a) process. This last step is catalyzed by certain phenols having low oxidation potentials, most likely by a mechanism involving single electron transfer. Dramatic rate enhancements were also observed for the cyclization of simple enynones 37 to methylenecyclopentenones 39 upon catalysis with either a-tocopherol (vitamin E, 40) or tert-butylcatechol(41). Further enhancements in both rate and yield were obtained under conditions of photoassisted single electron transfer (PET), which afforded 39 in yields of 80-98%.

  DOI：

  10.1021/jo00097a035

文献信息

• 4-<i>Endo</i>-<i>T</i><i>rig</i> Cyclization Processes Using Bis(collidine)bromine(I) Hexafluorophosphate as Reagent:  Preparation of 2-Oxetanones, 2-Azetidinones, and Oxetanes
  作者：Fadi Homsi、Gérard Rousseau

  DOI：10.1021/jo9810361

  日期：1999.1.1

  Reaction in methylene chloride of bis(collidine)bromine(I) hexafluorophosphate with alpha,beta-unsaturated acids and alpha,beta-unsaturated N-sulfonamides was found to lead diastereospecifically to the corresponding 2-oxetanones and 2-azetidinones in moderate yields (23-60%), by an almost unknown 4-endo cyclization. This process allow the synthesis of these interesting classes of products in one step

  发现六氟磷酸双（可力丁）溴（I）在二氯甲烷中与α，β-不饱和酸和α，β-不饱和N-磺酰胺的反应以中等收率非对映特异性地导致相应的2-氧杂环丁烷和2-氮杂环丁烷酮（23 -60％），几乎是未知的4内环化。该方法允许一步一步从普通底物合成这些有趣的产品类别。类似地，肉桂醇的反应通过相同的环化步骤导致了氧杂环丁烷（20-36％）；在醇官能团的α中存在宝石-二甲基基团似乎是有益的。