ethyl 2-methylpenta-2,3-dienoate | 24642-00-0

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: ethyl 2-methylpenta-2,3-dienoate
• 英文别名: ethyl α,γ-dimethylallenoate；ethyl 2-methyl penta-2,3-dienoate；ethyl 2-methyl-penta-2,3-dienoate；2-methyl-penta-2,3-dienoic acid ethyl ester；rac.-2-Methyl-penta-2,3-diensaeure-aethylester；racem. 2-Methyl-2,3-pentadiensaeure-ethylester；2,3-Pentadienoic acid, 2-methyl-, ethyl ester
• CAS: 24642-00-0
• 化学式: C₈H₁₂O₂
• 分子量: 140.182
• InChiKey: LPYOVYXRAKXTLB-UHFFFAOYSA-N

物化性质

• 沸点：
  55 °C(Press: 14 Torr)
• 密度：
  0.897±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.3
• 重原子数：
  10
• 可旋转键数：
  3
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.5
• 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：

  ethyl 2-methylpenta-2,3-dienoate 在 copper(ll) bromide 作用下， 以 乙醇 、 水 为溶剂， 反应 12.0h， 以72%的产率得到4-bromo-3,5-dimethyl-2(5H)-furanone
  参考文献：
  名称：

  CuBr2-mediated direct aqueous bromolactonization of 2,3-allenoates. An efficient access to β-bromobutenolides

  摘要：

  An efficient procedure for the synthesis of beta -bromobutenolides was developed. 2,3-Allenoates with different substitution patterns react with CuBr2 in aqueous ethanol at 80-85 degreesC to afford the corresponding beta -bromobutenolides in moderate to excellent yields (up to 97%). (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0040-4039(01)00634-7
• 作为产物：
  描述：

  {C5H5(CO)Fe}2(μ-CH3CHCC(CH3)CO2CH3) 在 一氧化碳 作用下， 以 氘代苯 为溶剂， 以91%的产率得到ethyl 2-methylpenta-2,3-dienoate
  参考文献：
  名称：

  Photochemical reactions of diiron .mu.-alkenylidene complexes with hydrogen, trialkylsilanes, and diazo compounds: cleavage to alkenes, vinylsilanes and allenes

  摘要：

  DOI：

  10.1021/ja00229a025

文献信息

• A Short Synthesis of Allene- and [3] Cumulenecarboxylates
  作者：Elisabeth Kohl-Mines、Hans-J�rgen Hansen

  DOI：10.1002/hlca.19850680819

  日期：1985.12.18

  [(alkoxycarbonyl)methylidene]phosphoranes to yield the corresponding esters of allene carboxylic acids (ef. Scheme 1 and Table 1). This procedure can also be applied to cinnamic acids which form [3]cumulenecarboxylates in low yield (Table 3). Under the same conditions 4-methyl-2-pentynoic acid can be transformed into (2E)-4-chloro-2,6-dimethylhepta-2,4,5-trienoate (Scheme 4).

  结果表明，在Bu 3 N和2-氯-1-甲基吡啶碘化物在甲苯或CH 2 Cl 2中的存在下，羧酸与[（烷氧基羰基）亚甲基]膦酸酯反应生成相应的烯丙基羧酸酯（ ef。方案1和表1）。该方法也可用于肉桂酸，其以低收率形成[3]枯烯基羧酸盐（表3）。在相同条件下，可以将4-甲基-2-戊酸转化为（2E）-4-氯-2,6-二甲基庚-2,4,5-三烯酸酯（方案4）。
• Synthesis of highly substituted oxetanes via [2+2] cycloaddition reactions of allenoates catalyzed by a guanidine Lewis base
  作者：Philipp Selig、Aleksej Turočkin、William Raven

  DOI：10.1039/c3cc40855h

  日期：——

  The first synthesis of highly substituted 3-alkyl-oxetan-2-ylidenes from allenoates was developed by using the bicyclic guanidine 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as an exceptionally active nitrogen Lewis base catalyst.

  首次报道了利用高活性氮路易斯碱催化剂——双环胍类化合物1,5,7-三氮杂双环[4.4.0]癸-5-烯（TBD），实现了从丙二烯酸盐制备高度取代的3-烷基-氧杂环丁烷-2-亚基的首例合成方法。
• Experimental and computational studies on H₂O-promoted, Rh-catalyzed transient-ligand-free <i>ortho</i>-C(sp²)–H amidation of benzaldehydes with dioxazolones
  作者：Jun Ding、Wei Jiang、He-Yuan Bai、Tong-Mei Ding、Dafang Gao、Xiaoguang Bao、Shu-Yu Zhang

  DOI：10.1039/c8cc04904a

  日期：——

  We develop an efficient and convenient ligand-free, rhodium-catalyzed ortho-C(sp²)–H amidation of benzaldehydes with dioxazolones using H₂O as the key promoter.

  我们开发了一种高效便捷的无配体、钯催化的苯甲醛与双噁唑酮的邻位C(sp2)-H胺化反应，其中以H2O作为关键促进剂。
• Asymmetric Olefin Isomerization of Butenolides via Proton Transfer Catalysis by an Organic Molecule
  作者：Yongwei Wu、Ravi P. Singh、Li Deng

  DOI：10.1021/ja205674x

  日期：2011.8.17

  general olefin isomerization was realized via biomimetic proton transfer catalysis with a new chiral organic catalyst. A broad range of mono- and disubstituted β,γ-unsaturated butenolides were transformed into the corresponding chiral α,β-unsaturated butenolides in high enantioselectivity and yield in the presence of as low as 0.5 mol % catalyst. Mechanistic studies have revealed the protonation as the

  通过使用新型手性有机催化剂的仿生质子转移催化，实现了前所未有的对映选择性和通用烯烃异构化。在低至 0.5 mol% 的催化剂存在下，多种单取代和双取代的 β,γ-不饱和丁烯内酯以高对映选择性和产率转化为相应的手性 α,β-不饱和丁烯内酯。机理研究表明质子化是决定速率的步骤。
• Michael Addition of Allenoates to Electron-Deficient Olefins: Facile Synthesis of 2-Alkynyl-Substituted Glutaric Acid Derivatives
  作者：Le-Ping Liu、Bo Xu、Gerald B. Hammond

  DOI：10.1021/ol801411b

  日期：2008.9.1

  A Michael addition of allenoates to electron-deficient olefins was mediated efficiently by a catalytic amount of commercial tetra-n-butylammonium fluoride (TBAF) under mild conditions. And 2-alkynyl substituted glutaric acid derivatives, which may be potential building blocks in organic synthesis, were obtained in good to excellent yields from these reactions. The mechanism for the Michael addition

  在温和条件下，催化量的商业化四正丁基氟化铵（TBAF）有效介导了烯丙酸酯向缺电子烯烃的迈克尔加成反应。从这些反应中可以很好地获得2-炔基取代的戊二酸衍生物，它们可能是有机合成的潜在组成部分。迈克尔加成反应的机理可能涉及炔属烯酸酯中间体的形成。