ethyl 3-methyl-4-oxononanoate | 344798-49-8

• 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: ethyl 3-methyl-4-oxononanoate
• 英文别名: Nonanoic acid, 3-methyl-4-oxo-, ethyl ester
• CAS: 344798-49-8
• 化学式: C₁₂H₂₂O₃
• 分子量: 214.305
• InChiKey: SMJQOCFRGMBQGT-UHFFFAOYSA-N

物化性质

• 沸点：
  289.1±13.0 °C(Predicted)
• 密度：
  0.941±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.6
• 重原子数：
  15
• 可旋转键数：
  9
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.83
• 拓扑面积：
  43.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  ethyl 3-methyl-4-oxononanoate 在 吡啶 、 氢氧化钾 、 sodium hydroxide 、 lithium aluminium tetrahydride 、 baker's yeast 、 porcine pancreatic lipase 、 葡萄糖 、 tap water 作用下， 以 四氢呋喃 、 甲醇 、 乙醇 、 水 、 二甲基亚砜 为溶剂， 反应 75.0h， 生成 (+)-(4S,5R)-5-acetoxy-4-methylnonanonitrile
  参考文献：
  名称：

  Baker's yeast-mediated approach to (−)-cis- and (+)-trans-Aerangis lactones

  摘要：

  The first enantioselective synthesis of natural (-)-cis-Aerangis lactone (-)-1a and its (+)-trans-diastereoisomer (+)-lb is described. The key steps in the synthesis are: (i) the enantiospecific and 100% diastereoselective baker's yeast reduction of 1,4-keto acid 2, to afford enantiopure trans- cognac lactone (+)-10; (ii) the regioselective PPL-mediated hydrolysis of the primary acetate moiety of diacetate (+)-(3S,4R)-3, obtained from (+)-10. Chain elongation by one carbon atom via cyanide substitution, and inversion of the configuration of C(5) in nitrile derivative (+)-21a are also required to complete the synthetic route to (-)-1a. (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(01)00314-7
• 作为产物：
  描述：

  3-甲基-4-氧代-2-丁烯酸乙酯 在 XAD 1180 resin manganese(IV) oxide 、 baker's yeast 、 葡萄糖 、 tap water 、 magnesium 作用下， 以 四氢呋喃 、 乙醇 、 二氯甲烷 为溶剂， 反应 52.0h， 生成 ethyl 3-methyl-4-oxononanoate
  参考文献：
  名称：

  Baker's yeast-mediated approach to (−)-cis- and (+)-trans-Aerangis lactones

  摘要：

  The first enantioselective synthesis of natural (-)-cis-Aerangis lactone (-)-1a and its (+)-trans-diastereoisomer (+)-lb is described. The key steps in the synthesis are: (i) the enantiospecific and 100% diastereoselective baker's yeast reduction of 1,4-keto acid 2, to afford enantiopure trans- cognac lactone (+)-10; (ii) the regioselective PPL-mediated hydrolysis of the primary acetate moiety of diacetate (+)-(3S,4R)-3, obtained from (+)-10. Chain elongation by one carbon atom via cyanide substitution, and inversion of the configuration of C(5) in nitrile derivative (+)-21a are also required to complete the synthetic route to (-)-1a. (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(01)00314-7

文献信息

• Enantioselective, Catalytic One‐Pot Synthesis of <i>γ</i> ‐Butyrolactone‐Based Fragrances
  作者：Ceyda Kumru、Thomas Classen、Jörg Pietruszka

  DOI：10.1002/cctc.201801040

  日期：2018.11.7

  Herein the preparative (1 g scale), stereoselective syntheses of various alkyl‐substituted γ‐butyrolactone fragrances 1 is described. The α,β‐unsaturated γ‐keto esters 2 as starting materials were synthesized by a Horner‐Wadsworth‐Emmons reaction and are further reduced by an ene reductase and alcohol dehydrogenase in a one‐pot enzyme cascade to nine desired γ‐butyrolactones 1, among them whisky (1 c)

  本文描述了各种烷基取代的γ-丁内酯香料1的制备（1 g规模）的立体选择性合成。以Horner-Wadsworth-Emmons反应合成作为原料的α，β-不饱和γ-酮酸酯2，并通过单罐酶级联反应中的烯还原酶和醇脱氢酶进一步将其还原为九种所需的γ-丁内酯1，其中威士忌（1 c）和白兰地内酯（1 d）。产品1以中等至良好的收率和非常好的非对映选择性获得了C。此外，对n Bu取代基的位置进行了置换，以研究其对酶级联反应的影响。
• Microbial bioreductions of γ- and δ-ketoacids and their esters
  作者：Cristina Forzato、Raffaella Gandolfi、Francesco Molinari、Patrizia Nitti、Giuliana Pitacco、Ennio Valentin

  DOI：10.1016/s0957-4166(01)00184-7

  日期：2001.5

  best choice for the bioreduction of ethyl 2-oxocyclohexylacetate 2e, which afforded cis-(−)-5e and trans-(−)-5e with 98 and 99% e.e., respectively. Reduction of 3-(2-oxocyclohexyl)propionic acid 3e with Pichia glucozyma gave predominantly the corresponding δ-lactone trans-(−)-6e with 94% e.e., whose absolute configuration was determined by means of CD spectroscopy.

  一系列酵母被用于脂肪族和芳香族γ-和δ-酮酸和酯的生物还原中，以研究通过其相应的γ-和δ-羟基酸和酯的中间体制备对映体纯的γ-和δ-内酯。用刻氏毕赤酵母生物还原4-氧代壬酸乙酯2a可得到具有99％ee的γ-壬醇（+）- 5a，而事实证明，毕赤酵母是2-氧代环己基乙酸乙酯2e生物还原的最佳选择，后者可提供顺式-（- ）-5e和反式-（-）- 5e的ee分别为98％和99％。还原3-（2-氧代环己基）丙酸具有葡糖酵母的3e主要产生具有94％ee的相应的δ-内酯反式-（-）- 6e，其绝对构型是通过CD光谱法确定的。
• A chemoenzymatic synthesis of optically active aza analogues of Quercus lactones
  作者：Fulvia Felluga、Valentina Gombac、Michela Pavan、Giuliana Pitacco、Ennio Valentin

  DOI：10.1016/j.tetasy.2003.10.014

  日期：2004.1

  The synthesis of optically active 4-methyl-5-n-butyl- and 5-n-pentylpyrrolidin-2-ones, aza analogues of the corresponding Quercus lactones, has been achieved by a chemoenzymatic procedure, involving in the enantiodifferentiating step the enzymatic kinetic resolution of the corresponding γ-ketoester precursors, followed by reductive amination and subsequent cyclization of the enantiomerically pure hydrolysis

  光学活性的4-甲基-5-正丁基和5-正戊基吡咯烷二-2-酮（相应的栎内酯的氮杂类似物）的合成已通过化学酶促方法完成，该化学酶促方法包括在对映异构步骤中进行酶促动力学。拆分相应的γ-酮酸酯前体，然后进行还原胺化，然后将对映体纯水解产物环化。还研究了反应条件的影响以及底物结构对酶水解的影响。
• Synthesis of all stereoisomers of cognac lactones via microbial reduction and enzymatic resolution strategies
  作者：Fabio Benedetti、Cristina Forzato、Patrizia Nitti、Giuliana Pitacco、Ennio Valentin、Michela Vicario

  DOI：10.1016/s0957-4166(01)00059-3

  日期：2001.3

  Both enantiomers of the diastereomeric cognac lactones have been synthesised using enzyme assisted reactions in the enantiodifferentiating step. This was accomplished by baker's yeast reduction of their precursors 3-methyl-4-oxononanoic acid and ester and by enzymatic hydrolysis of the latter. An inhibition of hydrolases by the products was observed. Trans-(+)-, trans-(-)-, cis-(+)- and cis-(-)-cognac lactones having 99, 88, 88 and 99% e.e., respectively, were thus obtained. Their CD spectra have also been studied. (C) 2001 Elsevier Science Ltd. All rights reserved.