Ethyl (2E,4E)-2-benzyl-3-ethoxy-5-phenyl-2,4-pentadienoate | 153864-79-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: Ethyl (2E,4E)-2-benzyl-3-ethoxy-5-phenyl-2,4-pentadienoate
• 英文别名: ethyl (2E,4E)-2-benzyl-3-ethoxy-5-phenylpenta-2,4-dienoate
• CAS: 153864-79-0
• 化学式: C₂₂H₂₄O₃
• 分子量: 336.431
• InChiKey: NPDKUCWPCCKUGW-YZORZNRUSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.3
• 重原子数：
  25
• 可旋转键数：
  9
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.23
• 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 (2E,4E)-2-benzyl-3-ethoxy-5-phenyl-2,4-pentadienoate 在 硫酸 、 水 、 silica gel 、 sodium chloride 作用下， 以 二氯甲烷 、 二甲基亚砜 为溶剂， 反应 76.0h， 生成 (E)-1,5-diphenyl-1-penten-3-one
  参考文献：
  名称：

  Allylidenetriphenylphosphorane as a bifunctional reagent: synthesis of cyclopentenones and .alpha.,.beta.-unsaturated ketones with [3-(alkoxycarbonyl)-2-ethoxy-2-propenylidene]triphenylphosphorane

  摘要：

  When (3-(ethoxycarbonyl)-2-ethoxy-2-propenylidene) triphenylphosphorane (6) was allowed to react with cu-bromo ketones 8a-d in dichloromethane in the presence of Cs2CO3 at room temperature, a [3 + 2] annulation occurred and led to the formation of the corresponding 2-ethoxycyclopentadienes 9a-d in excellent yields. Similarly, bromo thioester 8g underwent the annulation to give 4-(ethylthio)-cyclopentadiene 9g. Secondary bromides 2-bromo-3-pentanone and 2-bromocyclohexanone also afforded tetrasubstituted cyclopentadienes 9e and 9f in moderate yields when 2 equiv of 6 was used. The annulation is believed to proceed through a sequence involving a stepwise alkylation at the gamma position of 6 and an intramolecular Wittig reaction because of the fact that intermediate 11 was isolated. The resulting 2-ethoxycyclopentadienes 9a-g were converted quantitatively into the corresponding cyclopentenones 10a-g upon mild acid treatment. Furthermore, allylidenetriphenylphosphorane underwent a carbon elongation at both ends of the three-carbon unit via an alkylation-Wittig reaction sequence. (3-(tert-Butoxycarbonyl)-2-ethoxy-2-propenylidene)triphenylphosphorane (7) reacted first with alkyl halides and then with aldehydes in the presence of Cs2CO3 to give enol ethers 23a-f, which were converted into alpha,beta-unsaturated ketones 20, 21, and 25c-f by hydrolysis of the enol ether and then decarboxylation. In this way, shogaol (29), the pungent principle component of ginger, was conveniently synthesized starting from 2-methoxy-4-methylphenol.

  DOI：

  10.1021/jo00080a019
• 作为产物：
  描述：

  ethyl (E)-4-bromo-3-ethoxy-2-butenoate 在 sodium hydroxide 、 potassium tert-butylate 作用下， 以 N,N-二甲基甲酰胺 、 苯 为溶剂， 反应 119.0h， 生成 Ethyl (2E,4E)-2-benzyl-3-ethoxy-5-phenyl-2,4-pentadienoate
  参考文献：
  名称：

  Allylidenetriphenylphosphorane as a bifunctional reagent: synthesis of cyclopentenones and .alpha.,.beta.-unsaturated ketones with [3-(alkoxycarbonyl)-2-ethoxy-2-propenylidene]triphenylphosphorane

  摘要：

  When (3-(ethoxycarbonyl)-2-ethoxy-2-propenylidene) triphenylphosphorane (6) was allowed to react with cu-bromo ketones 8a-d in dichloromethane in the presence of Cs2CO3 at room temperature, a [3 + 2] annulation occurred and led to the formation of the corresponding 2-ethoxycyclopentadienes 9a-d in excellent yields. Similarly, bromo thioester 8g underwent the annulation to give 4-(ethylthio)-cyclopentadiene 9g. Secondary bromides 2-bromo-3-pentanone and 2-bromocyclohexanone also afforded tetrasubstituted cyclopentadienes 9e and 9f in moderate yields when 2 equiv of 6 was used. The annulation is believed to proceed through a sequence involving a stepwise alkylation at the gamma position of 6 and an intramolecular Wittig reaction because of the fact that intermediate 11 was isolated. The resulting 2-ethoxycyclopentadienes 9a-g were converted quantitatively into the corresponding cyclopentenones 10a-g upon mild acid treatment. Furthermore, allylidenetriphenylphosphorane underwent a carbon elongation at both ends of the three-carbon unit via an alkylation-Wittig reaction sequence. (3-(tert-Butoxycarbonyl)-2-ethoxy-2-propenylidene)triphenylphosphorane (7) reacted first with alkyl halides and then with aldehydes in the presence of Cs2CO3 to give enol ethers 23a-f, which were converted into alpha,beta-unsaturated ketones 20, 21, and 25c-f by hydrolysis of the enol ether and then decarboxylation. In this way, shogaol (29), the pungent principle component of ginger, was conveniently synthesized starting from 2-methoxy-4-methylphenol.

  DOI：

  10.1021/jo00080a019

文献信息

• Allylidenetriphenylphosphorane as a bifunctional reagent: synthesis of cyclopentenones and .alpha.,.beta.-unsaturated ketones with [3-(alkoxycarbonyl)-2-ethoxy-2-propenylidene]triphenylphosphorane
  作者：Minoru Hatanaka、Yuichiro Himeda、Ritsuo Imashiro、Yasuhiro Tanaka、Ikuo Ueda

  DOI：10.1021/jo00080a019

  日期：1994.1

  When (3-(ethoxycarbonyl)-2-ethoxy-2-propenylidene) triphenylphosphorane (6) was allowed to react with cu-bromo ketones 8a-d in dichloromethane in the presence of Cs2CO3 at room temperature, a [3 + 2] annulation occurred and led to the formation of the corresponding 2-ethoxycyclopentadienes 9a-d in excellent yields. Similarly, bromo thioester 8g underwent the annulation to give 4-(ethylthio)-cyclopentadiene 9g. Secondary bromides 2-bromo-3-pentanone and 2-bromocyclohexanone also afforded tetrasubstituted cyclopentadienes 9e and 9f in moderate yields when 2 equiv of 6 was used. The annulation is believed to proceed through a sequence involving a stepwise alkylation at the gamma position of 6 and an intramolecular Wittig reaction because of the fact that intermediate 11 was isolated. The resulting 2-ethoxycyclopentadienes 9a-g were converted quantitatively into the corresponding cyclopentenones 10a-g upon mild acid treatment. Furthermore, allylidenetriphenylphosphorane underwent a carbon elongation at both ends of the three-carbon unit via an alkylation-Wittig reaction sequence. (3-(tert-Butoxycarbonyl)-2-ethoxy-2-propenylidene)triphenylphosphorane (7) reacted first with alkyl halides and then with aldehydes in the presence of Cs2CO3 to give enol ethers 23a-f, which were converted into alpha,beta-unsaturated ketones 20, 21, and 25c-f by hydrolysis of the enol ether and then decarboxylation. In this way, shogaol (29), the pungent principle component of ginger, was conveniently synthesized starting from 2-methoxy-4-methylphenol.