(R)-3-(2,5-dimethoxy-4-methylphenyl)butanoic acid | 1313051-72-7

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 异戊烯醇脂质
• 英文名称: (R)-3-(2,5-dimethoxy-4-methylphenyl)butanoic acid
• 英文别名: (R)-3-(2,5-dimethoxy-4-methylphenyl)butan-1-ol
• CAS: 1313051-72-7
• 化学式: C₁₃H₂₀O₃
• 分子量: 224.3
• InChiKey: NLSRVIVKVIZYSL-SECBINFHSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  16.0
• 可旋转键数：
  5.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.54
• 拓扑面积：
  38.69
• 氢给体数：
  1.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  (R)-3-(2,5-dimethoxy-4-methylphenyl)butanoic acid 在 pyridinium chlorochromate 作用下， 以 二氯甲烷 为溶剂， 反应 3.0h， 生成
  参考文献：
  名称：

  Enantioselective syntheses of the assigned structures of the helibisabonols A and B

  摘要：

  The enantioselective syntheses of the compounds with the assigned structures of the helibisabonols A and B have been accomplished. Using an enzymatic desymmetrization of the sigma-symmetrical diol (route a) and a diastereoselective conjugate addition of the methyl to the enone with a chiral auxiliary (route b) we constructed the key tertiary stereogenic center at the benzylic position (C7) and then used an asymmetric dihydroxylation for assembling the C10 stereogenic center. In addition, possible diastereoisomers of the natural products were prepared and detailed comparisons of the H-1 and C-13 NMR spectra were conducted. As a result, the structure originally assigned to helibisabonol A may be revised to (7R,10R)-1. In the case of helibisabonol B, the (7R,10R)-2 would be reasonable based on a comparison of the NMR data and the biogenetic parallelism with helibisabonol A. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2011.03.064
• 作为产物：
  描述：

  (S)-2-(2,5-dimethoxy-4-methylphenyl)propan-1-ol 在 吡啶 、 lithium aluminium tetrahydride 、 sodium hydroxide 作用下， 以 乙醚 、 二甲基亚砜 为溶剂， 反应 20.0h， 生成 (R)-3-(2,5-dimethoxy-4-methylphenyl)butanoic acid
  参考文献：
  名称：

  Lipase-mediated resolution of substituted 2-aryl-propanols: application to the enantioselective synthesis of phenolic sesquiterpenes

  摘要：

  A comprehensive study of the lipase-mediated resolution of substituted 2-aryl-propanols is reported. The latter alcohols were submitted to the irreversible acetylation catalyzed either by PPL, CRL, or lipase PS. The enantioselectivity of these transformations was dependent on the type of lipase used. The type of substituents and particularly their position on the aromatic ring strongly affected the selectivity of the reaction. The experiments described prove that PPL is the more versatile lipase catalyzing the acetylation with an enantiomeric ratio (E) value that ranges from 1 up to 144, depending on the substrate used. Conversely, the same transformations were catalyzed by CRL and lipase PS with an enantiomeric ratio value, which is always less than 5. The remarkable behavior of PPL was exploited in the large scale resolution of some substituted 2-aryl-propanols whose enantiomeric forms are relevant building blocks in the enantioselective synthesis of phenolic sesquiterpenes. By these means, the synthesis of (S)-turmeronol B and the formal syntheses of (R)-curcumene, (R)-curcuphenol, (R)-xanthorrhizol, and (R)-curcuhydroquinone were accomplished. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2011.03.012

文献信息

• Highly Enantioselective Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Esters
  作者：Jia-Qi Li、Xu Quan、Pher G. Andersson

  DOI：10.1002/chem.201200907

  日期：2012.8.20

  α,β‐Unsaturated esters have been employed as substrates in iridium‐catalyzed asymmetric hydrogenation. Full conversions and good to excellent enantioselectivities (up to 99 % ee) were obtained for a broad range of substrates with both aromatic‐ and aliphatic substituents on the prochiral carbon. The hydrogenated products are highly useful as building blocks in the synthesis of a variety of natural

  在铱催化的不对称氢化反应中，α，β-不饱和酯已被用作底物。对于在手性碳上同时具有芳族和脂族取代基的多种底物，可实现完全转化和良好至优异的对映选择性（高达99％  ee）。氢化产物在多种天然产物和药物的合成中作为构建基非常有用。