4-methyl-7-octen-2-one | 140902-60-9

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 4-methyl-7-octen-2-one
• 英文别名: 4-methyl-7-en-2-one；4-Methyloct-7-en-2-one
• CAS: 140902-60-9
• 化学式: C₉H₁₆O
• 分子量: 140.225
• InChiKey: XWIZYKUTPBZTJX-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.3
• 重原子数：
  10
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  4-methyl-7-octen-2-one 在 六甲基磷酰三胺 、 samarium diiodide 作用下， 以 四氢呋喃 、 叔丁醇 为溶剂， 以86%的产率得到(1R*,2R*)-1,2,5-trimethylcyclohexan-1-ol
  参考文献：
  名称：

  Samarium(II) iodide-induced reductive cyclization of unactivated olefinic ketones. Sequential radical cyclization/intermolecular nucleophilic addition and substitution reactions

  摘要：

  Samarium(II) iodide in the presence of HMPA effectively promotes the intramolecular coupling of unactivated olefinic ketones by a reductive ketyl-olefin radical-cyclization process. The reaction is quite general for the formation of 5- and 6-membered carbocycles and even provides modest yields in less facile cyclization processes as evidenced by the generation of methylcyclooctanol via an 8-endo cyclization. Sequential radical cyclization-intermolecular nucleophilic addition/substitution processes set the SmI2 reaction apart from its radical-chain, photochemical, and electrochemical counterparts. In addition to delineating the synthetic potential of this reaction, the role played by HMPA in enhancing SmI2 reactivity has been further refined, and a model correlating the high diastereoselectivity and product distribution in SmI2-promoted reductive coupling processes with HMPA concentration has been established.

  DOI：

  10.1021/jo00037a033
• 作为产物：
  描述：

  甲基三苯基溴化膦 、 N-methoxy-N-methyl-3-methyl-6-oxohexanamide 在 正丁基锂 、 盐酸 作用下， 以 四氢呋喃 、 正己烷 、 乙醚 为溶剂， 反应 15.5h， 以42%的产率得到4-methyl-7-octen-2-one
  参考文献：
  名称：

  Direct Conversion of N-Methoxy-N-methylamides (Weinreb Amides) to Ketones via a Nonclassical Wittig Reaction

  摘要：

  N-Methoxy-N-methylamides (Weinreb amides) are converted efficiently into ketones by reaction with alkylidenetriphenylphosphoranes and in situ hydrolysis of the product.

  DOI：

  10.1021/ol050337b

文献信息

• Stereochemical Investigations of Samarium(II) Iodide-Promoted 5-Exo and 6-Exo Ketyl-Olefin Radical Cyclization Reactions
  作者：Gary A. Molander、Jeffrey A. McKie

  DOI：10.1021/jo00109a018

  日期：1995.2

  Samarium(II) iodide (SmI2)-promoted ketyl cyclizations of several substituted, unsaturated ketones, providing various cyclopentyl and cyclohexyl systems, have been investigated. The resulting experiments provide stereochemical insight into these reactions and in addition outline the synthetic potential of these 5-exe and 6-exo radical cyclization processes.