6-Isobutyl-3-ethoxy-2-cyclohexenone | 99196-14-2

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 6-Isobutyl-3-ethoxy-2-cyclohexenone
• 英文别名: 3-ethoxy-6-isobutylcyclohex-2-en-1-one；6-(2-Methylpropyl)-3-ethoxy-2-cyclohexenone；3-Ethoxy-6-(2-methylpropyl)cyclohex-2-en-1-one
• CAS: 99196-14-2
• 化学式: C₁₂H₂₀O₂
• 分子量: 196.29
• InChiKey: VLVZOBLLQVRDIM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  14
• 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：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  6-Isobutyl-3-ethoxy-2-cyclohexenone 在 盐酸 、 sodium hydroxide 、 双氧水 作用下， 以 甲醇 、 乙醚 、 正己烷 、 水 、 乙酸乙酯 为溶剂， 反应 3.5h， 生成 3-Methyl-4-isobutyl-2,3-epoxycyclohexan-1-one
  参考文献：
  名称：

  New approaches to the synthesis of alkyl-substituted enol lactone systems, inhibitors of the serine protease elastase

  摘要：

  We have synthesized a series of alkyl-substituted enol lactones designed to act as mechanism-based inhibitors of human neutrophil elastase (HLE). General methods were developed for the preparation of alpha- and beta-alkyl-substituted 5-hexynoic acids by the bromoform reaction on the corresponding alkynoic methyl ketone, prepared by an Eschenmoser-Tanabe fragmentation sequence from a suitably substituted cyclohexenone. By this method, beta-methyl- and beta,beta-dimethyl-5-hexynoic acids were synthesized from commercially available isophorone and 3,5-dimethyl-2-cyclohexen-1-one, respectively. Alpha-Substituted 5-hexynoic acids were prepared from 3-ethoxy-2-cyclohexen-1-one, using a novel ZnCl2-mediated alkylation that we developed; this method gives high yields of alpha'-alkylation products, even with secondary halides. The most efficient method for the preparation of alpha-substituted 5-hexynoic acids involved a four-reaction sequence-alkylation of the alpha-substituted ester with 1,4-dibromobutane, elimination, bromination and bisdehydrobromination-that proceeded in high overall yield. Protio enol lactonizations were performed with mercury(II) catalysis in CH2Cl2 or CH2Cl2-H2O. Stereo-selective Z-bromo enol lactonization was carried out by Br+-induced lactonization in the presence of Ag+. E-Bromo enol lactonization with N-bromosuccinimide in CH2Cl2 in the presence of a small amount of water gave better yields and shorter reaction times than the traditional anhydrous conditions. In studies of the inhibitory activity of these lactones toward several proteases (reported in full elsewhere), we found that the alpha-alkyl-substituted protio and bromo enol lactones 1-3 were very good inhibitors of HLE, with k(a)/K(i) values ranging from 14 500 to 37 500 M-1 s-1; the beta-alkyl-substituted enol lactones 5-8 showed only moderate inhibition of HLE.

  DOI：

  10.1021/jo00059a049
• 作为产物：
  描述：

  3-ethoxy-6-(2-methylallyl)cyclohex-2-en-1-one 在 Cp*Rh(2-(2-pyridyl)phenyl)H 、 氢气 作用下， 以 甲醇 为溶剂， 20.0 ℃ 、551.59 kPa 条件下， 反应 24.0h， 以93%的产率得到6-Isobutyl-3-ethoxy-2-cyclohexenone
  参考文献：
  名称：

  氢化铑催化C=C键的高选择性加氢

  摘要：

  在温和条件下（室温，80 psi H 2）Cp*Rh(2-(2-吡啶基)苯基)H催化α,β-不饱和羰基化合物（包括天然产物前体）中C=C键的选择性氢化在 β 位具有庞大的取代基，并且底物具有一系列额外的官能团。它还催化许多分离的双键的氢化。机理研究表明，不涉及自由基中间体，并且催化剂似乎是均相的，从而为类似氢化过程的现有方案提供了重要的互补性。

  DOI：

  10.1021/jacs.1c04683

文献信息

• Pyrazolopyridine cycloalkanone derivatives
  申请人：ICI AMERICAS INC.

  公开号：EP0141608A2

  公开（公告）日：1985-05-15

  Novel tetrahydropyrazolo-[3,4-b]quinolinones, cyclo- benta[b]pyrazolo-[4,3-e]pyridinones and cyclohepta[b]-pyraz- olo-[4,3-e]pyridinones are disclosed useful as anxiolytics hav- ng reduced side effects are disclosed, including methods of preparation, pharmaceutical compositions containing them and intermediates used in their preparation.

  公开了新型四氢吡唑并-[3,4-b]喹啉酮类、环庚并[b]吡唑并-[4,3-e]吡啶酮类和环庚并[b]吡唑并-[4,3-e]吡啶酮类抗焦虑药物，包括制备方法、含有这些药物的药物组合物以及用于制备这些药物的中间体。
• US4546104A
  申请人：——

  公开号：US4546104A

  公开（公告）日：1985-10-08
• Highly Selective Hydrogenation of C═C Bonds Catalyzed by a Rhodium Hydride
  作者：Yiting Gu、Jack R. Norton、Farbod Salahi、Vladislav G. Lisnyak、Zhiyao Zhou、Scott A. Snyder

  DOI：10.1021/jacs.1c04683

  日期：2021.6.30

  Under mild conditions (room temperature, 80 psi of H2) Cp*Rh(2-(2-pyridyl)phenyl)H catalyzes the selective hydrogenation of the C═C bond in α,β-unsaturated carbonyl compounds, including natural product precursors with bulky substituents in the β position and substrates possessing an array of additional functional groups. It also catalyzes the hydrogenation of many isolated double bonds. Mechanistic

  在温和条件下（室温，80 psi H 2）Cp*Rh(2-(2-吡啶基)苯基)H催化α,β-不饱和羰基化合物（包括天然产物前体）中C=C键的选择性氢化在 β 位具有庞大的取代基，并且底物具有一系列额外的官能团。它还催化许多分离的双键的氢化。机理研究表明，不涉及自由基中间体，并且催化剂似乎是均相的，从而为类似氢化过程的现有方案提供了重要的互补性。
• New approaches to the synthesis of alkyl-substituted enol lactone systems, inhibitors of the serine protease elastase
  作者：Wei Dai、John A. Katzenellenbogen

  DOI：10.1021/jo00059a049

  日期：1993.3

  We have synthesized a series of alkyl-substituted enol lactones designed to act as mechanism-based inhibitors of human neutrophil elastase (HLE). General methods were developed for the preparation of alpha- and beta-alkyl-substituted 5-hexynoic acids by the bromoform reaction on the corresponding alkynoic methyl ketone, prepared by an Eschenmoser-Tanabe fragmentation sequence from a suitably substituted cyclohexenone. By this method, beta-methyl- and beta,beta-dimethyl-5-hexynoic acids were synthesized from commercially available isophorone and 3,5-dimethyl-2-cyclohexen-1-one, respectively. Alpha-Substituted 5-hexynoic acids were prepared from 3-ethoxy-2-cyclohexen-1-one, using a novel ZnCl2-mediated alkylation that we developed; this method gives high yields of alpha'-alkylation products, even with secondary halides. The most efficient method for the preparation of alpha-substituted 5-hexynoic acids involved a four-reaction sequence-alkylation of the alpha-substituted ester with 1,4-dibromobutane, elimination, bromination and bisdehydrobromination-that proceeded in high overall yield. Protio enol lactonizations were performed with mercury(II) catalysis in CH2Cl2 or CH2Cl2-H2O. Stereo-selective Z-bromo enol lactonization was carried out by Br+-induced lactonization in the presence of Ag+. E-Bromo enol lactonization with N-bromosuccinimide in CH2Cl2 in the presence of a small amount of water gave better yields and shorter reaction times than the traditional anhydrous conditions. In studies of the inhibitory activity of these lactones toward several proteases (reported in full elsewhere), we found that the alpha-alkyl-substituted protio and bromo enol lactones 1-3 were very good inhibitors of HLE, with k(a)/K(i) values ranging from 14 500 to 37 500 M-1 s-1; the beta-alkyl-substituted enol lactones 5-8 showed only moderate inhibition of HLE.