Ethyl 2-methyl-5-(4-methoxyphenyl)-2(E)-pentenoate | 154807-78-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯酚醚
• 英文名称: Ethyl 2-methyl-5-(4-methoxyphenyl)-2(E)-pentenoate
• 英文别名: ethyl (E)-5-(4-methoxyphenyl)-2-methylpent-2-enoate
• CAS: 154807-78-0
• 化学式: C₁₅H₂₀O₃
• 分子量: 248.322
• InChiKey: QYYVODYYUZFWQV-WUXMJOGZSA-N

物化性质

• 沸点：
  359.2±30.0 °C(predicted)
• 密度：
  1.025±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.5
• 重原子数：
  18
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  Ethyl 2-methyl-5-(4-methoxyphenyl)-2(E)-pentenoate 在 盐酸 、 N,N-二甲基丙烯基脲 、 sodium chlorite 、 sodium dihydrogenphosphate 、 lithium aluminium tetrahydride 、 2-甲基-2-丁烯 、 草酰氯 、 manganese triacetate 、 三溴化磷 、 二异丁基氢化铝 、 二甲基亚砜 、 三乙胺 、 锌 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲醇 、 乙醚 、 二氯甲烷 、 水 、 甲苯 、 叔丁醇 为溶剂， 反应 89.83h， 生成 O-methylpodocarpic acid
  参考文献：
  名称：

  Asymmetric induction in manganese(III)-based oxidative free-radical cyclizations of phenylmenthyl acetoacetates and 2,5-dimethylpyrrolidine acetoacetamides

  摘要：

  Mn(III)-based oxidative free-radical cyclization of phenylmenthyl ester 1e afforded 90% of 13 with 86% de. Cyclization of 31b provided 56% of (+)-podocarpic acid precursor 32e with 82% de. The direction of de was opposite in these two cases. Oxidative cyclization of a-methyl beta-keto ester 44b gave a 1:1.6 mixture of 46b and 47b while alpha-propyl beta-keto ester 44d produced a > 10:1 mixture of 46d and 47d indicating that the extent and direction of de is dependent on the size of the alpha-substituent The reaction proceeds through transition states 12 and 56 with large alpha-substituents and through transition states 19 and 57 with small a-substituents. The de depends on the double-bond substitution pattern as shown by the decreased de with 37b and 37d, and selectivity in the 5-exo cyclization of 64b, 65b, 70b, and 71b is low.

  DOI：

  10.1021/jo00079a006
• 作为产物：
  描述：

  3-(4-甲氧苯基)-1-丙醇 在 sodium hydride 、 pyridinium chlorochromate 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 3.5h， 生成 Ethyl 2-methyl-5-(4-methoxyphenyl)-2(E)-pentenoate
  参考文献：
  名称：

  Asymmetric induction in manganese(III)-based oxidative free-radical cyclizations of phenylmenthyl acetoacetates and 2,5-dimethylpyrrolidine acetoacetamides

  摘要：

  Mn(III)-based oxidative free-radical cyclization of phenylmenthyl ester 1e afforded 90% of 13 with 86% de. Cyclization of 31b provided 56% of (+)-podocarpic acid precursor 32e with 82% de. The direction of de was opposite in these two cases. Oxidative cyclization of a-methyl beta-keto ester 44b gave a 1:1.6 mixture of 46b and 47b while alpha-propyl beta-keto ester 44d produced a > 10:1 mixture of 46d and 47d indicating that the extent and direction of de is dependent on the size of the alpha-substituent The reaction proceeds through transition states 12 and 56 with large alpha-substituents and through transition states 19 and 57 with small a-substituents. The de depends on the double-bond substitution pattern as shown by the decreased de with 37b and 37d, and selectivity in the 5-exo cyclization of 64b, 65b, 70b, and 71b is low.

  DOI：

  10.1021/jo00079a006

文献信息

• Gold-Catalyzed Asymmetric Thioallylation of Propiolates via Charge-Induced Thio-Claisen Rearrangement
  作者：Hanbyul Kim、Jiwon Jang、Seunghoon Shin

  DOI：10.1021/jacs.0c09783

  日期：2020.12.9

  A gold(I)-catalyzed enantioselective thioallylation of propiolates with allyl sulfides is described. The key mechanistic element is a sulfonium-induced Claisen rearrangement which helps minimize the allyl dissociation and render higher enantioselectivity. This protocol features remarkable scope of the allyl moiety, allowing enantiocontrolled synthesis of all-carbon quaternary centers, and exhibits

  描述了金 (I) 催化的丙炔酸酯与烯丙基硫化物的对映选择性硫代烯丙基化。关键的机制元素是锍诱导的克莱森重排，这有助于最大限度地减少烯丙基离解并提供更高的对映选择性。该协议具有显着的烯丙基部分范围，允许全碳四元中心的对映控制合成，并与许多路易斯碱和 π 键表现出卓越的官能团兼容性。Claisen 重排的这种分子间变体同时形成 CS 和 CC 键，为获得有趣的光学活性有机硫化合物提供了有效的途径，这些化合物可以通过乙烯基硫化物作为功能手柄进一步转化。对于烯丙基硫化物，反应速率为零级，这表明可逆抑制，为催化剂提供静止状态。哈米特图显示了与 σp 值的相关性，表明限制周转的 σ 重排，其中硫上电子密度的降低加速了重排。
• Zhang Qingwei, Mohan Raju M., Cook Laura, Kazanis Sophia, Peisach Daniel,+, J. Org. Chem, 58 (1993) N 27, S 7640-7651
  作者：Zhang Qingwei, Mohan Raju M., Cook Laura, Kazanis Sophia, Peisach Daniel,+

  DOI：——

  日期：——