ethyl 2,4-dimethylpent-2-enoate | 13979-26-5

• 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 2,4-dimethylpent-2-enoate
• 英文别名: Ethyl 2,4-dimethyl-2-pentenoate
• CAS: 13979-26-5
• 化学式: C₉H₁₆O₂
• 分子量: 156.225
• InChiKey: AAYYTNPAPOADFH-UHFFFAOYSA-N

物化性质

• 沸点：
  187.8±9.0 °C(Predicted)
• 密度：
  0.895±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  11
• 可旋转键数：
  4
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.67
• 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 2,4-dimethylpent-2-enoate 在 三乙基硼 、 碘 、 silver nitrate 作用下， 以 正己烷 、 二氯甲烷 为溶剂， 反应 9.0h， 生成 (S)-2-((R)-1-Methoxy-2-methyl-propyl)-2-methyl-pent-4-enoic acid ethyl ester
  参考文献：
  名称：

  Stereoselective Radical Carbon−Carbon Bond Forming Reactions of β-Alkoxy Esters:  Atom and Group Transfer Allylations under Bidentate Chelation Controlled Conditions

  摘要：

  The radical allylation of a series of beta-alkoxy esters using allyltrimethylsilane in the presence of MgBr2 . OEt(2) is described. Under bidentate chelation-controlled conditions, allyltrimethylsilane rivals allyltributyltin in efficiency and is a superior reagent from ecological and practical perspectives. The reactions work with iodides and bromides as well as phenylselenides. The isolation of gamma-phenylseleno intermediates indicates that the reaction proceeds by an atom transfer process. These reactions require initiation with Et(3)B and can be inhibited by galvinoxyl, m- and p-dinitrobenzene indicating that this atom transfer sequence involves the intermediacy of radicals.

  DOI：

  10.1021/ja9541241
• 作为产物：
  描述：

  (E)-乙基4-甲基戊-2-烯酯 在 silica gel 作用下， 以 甲苯 为溶剂， 反应 49.0h， 生成 ethyl 2,4-dimethylpent-2-enoate
  参考文献：
  名称：

  利用共轭加成的氮亲核试剂（R 2 NLi）对α，β-不饱和酯进行立体选择性α-烷基化

  摘要：

  用酰胺化锂[LiNPr i 2和LiN（CH 2 Ph）SiMe 3 ]处理α，β-不饱和酯（1），然后烷基化并消除氨基基团产生具有高立体选择性的三取代烯酸酯（2）。

  DOI：

  10.1039/c39870001410

文献信息

• B(C₆F₅)₃: A New Class of Strong and Bulky Lewis Acid for <i>Exo</i>-Selective Intermolecular Diels–Alder Reactions of Unreactive Acyclic Dienes with α,β-Enals
  作者：Jia-Hui Zhou、Bing Jiang、Fei-Fan Meng、Yun-He Xu、Teck-Peng Loh

  DOI：10.1021/acs.orglett.5b02066

  日期：2015.9.18

  Lewis acid B(C6F5)3 catalyzed the Diels–Alder reactions of multisubstituted open-chain dienes and α,β-enals to afford the desired products with high exo-selectivities are reported. The substituent effect of the dienes and dienophiles on the product’s stereoselectivity was thoroughly investigated, and it was found that most of the desired exo-Diels–Alder products could be obtained in good yields and

  据报道，路易斯酸B（C 6 F 5）3催化多取代的开链二烯和α，β-烯醛的Diels-Alder反应，可提供所需的具有高外选择性的产物。彻底研究了二烯和亲二烯体对产物立体选择性的取代作用，发现大多数所需的exo -Diels-Alder产品可以高收率和高exo-立体选择性获得。
• Synthesis and Odor of Aliphatic Musks: Discovery of a New Class of Odorants
  作者：Philip Kraft、Walter Eichenberger

  DOI：10.1002/ejoc.200300578

  日期：2004.1

  4′′-trimethylpent-2′′-enyloxy)propyl cyclopropanecarboxylate [(2′′E)-19], which has a powerful and sweet musk odor and slightly fruity nuances, was found to be a typical representative of this new class of musk odorants, was subjected to conformational analysis. In addition, we report the synthesis and olfactory properties of the related ketones 28−30, the 2-methyl-2-(1′,4′,4′-trimethylpent-2′-enyloxy)propyl

  为了寻找新的脂肪族麝香，我们合成了 2-[1'-(3'',3''-二甲基环己-1''-烯基)乙氧基]-2-甲基丙醇 (8) 的丙酸酯，2-[1' -(5'',5''-二甲基环己-1''-烯基)乙氧基]-2-甲基丙醇(11)，羟基乙酸1-(3'，3'-二甲基环己-1'-烯基)乙酯( 12)，以及以 1-(3',3'-二甲基环己-1'-烯基)乙酮 (5) 为原料的羟基乙酸 1-(5',5'-二甲基环己-1'-烯基)乙酯 (13)和 1-乙炔基-3,3-二甲基环己醇 (9)。我们发现 3,3-二甲基环己烯基衍生物 8（气味阈值 0.2 ng/空气）和 12（气味阈值 0.6 ng/空气）是优良的麝香气味剂，因此，我们构建了 1,2,4-trimethylpent-2-烯氧基类似物作为 seco 版本。酯 17-26 的合成开始于异丁醛 (14) 的 Wittig-Horner-Emmons 反应，然后皂化，甲基锂烷基化、LAH
• New Methods for Synthesis of α,β-Unsaturated Carboxylic Esters from Carbonyl Compounds Using Monoanions of Dithiocarbonates, and Dianions of Ethyl Mercaptoacetate and Ethyl 2-Mercaptopropionate
  作者：Kazuhiko Tanaka、Nobuyuki Yamagishi、Rikuhei Tanikaga、Aritsune Kaji

  DOI：10.1246/bcsj.52.3619

  日期：1979.12

  The lithium enolates of O-alkyl S-alkoxycarbonylmethyl dithiocarbonates and monothiocarbonates were found to be efficient reagents for the synthesis of α,β-unsaturated esters from carbonyl compound...

  发现 O-烷基 S-烷氧基羰基甲基二硫代碳酸酯和单硫代碳酸酯的锂烯醇化物是从羰基化合物合成 α,β-不饱和酯的有效试剂...
• Asymmetric Dihydroxylation of β,γ-Unsaturated Carboxylic Esterswith Trisubstituted C=C Bonds – Enantioselective Syntheses of Trisubstituted γ-Butyrolactones
  作者：Tobias Kapferer、Reinhard Brückner

  DOI：10.1002/ejoc.200500963

  日期：2006.5

  β,γ-Unsaturated esters with stereodefined trisubstitued C=C double bonds were prepared by the Arndt–Eistert homologation of α,β-unsaturated carboxyl halides, by two-step methoxycarbonylation of allylbarium reagents, by deconjugation of α,β-unsaturated esters, and by Horner–Wadsworth–Emmons variants of the Stobbe condensation. Sharpless asymmetric dihydroxylation of the β,γ-unsaturated esters, followed

  具有立体定义的三取代 C=C 双键的 β,γ-不饱和酯是通过 α,β-不饱和羧基卤化物的 Arndt-Eistert 同系物制备的，通过烯丙基钡试剂的两步甲氧基羰基化，通过 α,β-不饱和酯的解偶联，和霍纳-沃兹沃思-埃蒙斯的 Stobbe 凝聚变体。β,γ-不饱和酯的 Sharpless 不对称二羟基化，然后自发环化，以中等至良好的产率得到 β-羟基-γ-内酯，对映体过量高达 97%。类似地，四羟基-γ-内酯是从二不饱和酯中获得的；这些内酯被转化为双内酯和不饱和β-羟基γ-内酯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
• Lithium n-benzyltrimethylsilylamide (LSA): a new reagent for conjugate addition - enolate trapping reactions
  作者：Naoki Asao、Tadao Uyehara、Yoshinori Yamamoto

  DOI：10.1016/s0040-4020(01)86664-3

  日期：1988.1

  4-manner, though the reaction of ordinary lithium amides with α,β-unsaturated carbonyl compounds is accompanied with a 1,2-addition and hydrogen abstraction at the γ-position. The conjugate addition via LSA followed by enolate trapping with electrophiles produces the corresponding α-substituted β-amino esters, which are, in turn, converted into β-lactams and α-substituted α, β-unsaturated esters.

  尽管普通锂酰胺与α，β-不饱和羰基化合物的反应伴随有1,2-加成和γ-氢的夺氢，但N-苄基三甲基甲硅烷基锂（LSA）可以1,4-方式添加到巴豆酸中。位置。经由LSA的共轭添加，然后用亲电试剂进行烯醇化捕集，产生相应的α-取代的β-氨基酯，其随后转化为β-内酰胺和α-取代的α，β-不饱和酯。