2-benzoylamino-2-(thien-2-yl)methylpenta-3,4-dienoic acid methyl ester | 848675-10-5

• 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: 2-benzoylamino-2-(thien-2-yl)methylpenta-3,4-dienoic acid methyl ester
• CAS: 848675-10-5
• 化学式: C₁₈H₁₇NO₃S
• 分子量: 327.404
• InChiKey: HXPVUZFJMCBLCP-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.1
• 重原子数：
  23
• 可旋转键数：
  7
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.17
• 拓扑面积：
  83.6
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  2-benzoylamino-2-(thien-2-yl)methylpenta-3,4-dienoic acid methyl ester 在 sodium hydride 作用下， 以 二甲基亚砜 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 0.5h， 生成 2-benzoyl-6-methylene-5-oxo-1-(thien-2-yl)methyl-1,2,3,5,6,6a-hexahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester
  参考文献：
  名称：

  Heterocyclic α-Alkylidene Cyclopentenones Obtained via a Pauson−Khand Reaction of Amino Acid Derived Allenynes. A Scope and Limitation Study Directed toward the Preparation of a Tricyclic Pyrrole Library

  摘要：

  [GRAPHICS]The synthesis of a novel class of tricyclic pyrroles has been accomplished by using a Pauson-Khand/Stetter/Paal-Knorr reaction sequence. Full details of the Pauson-Khand reaction of amino acid tethered allenynes 4a-e and 9a-d are disclosed. The study of this reaction led to the discovery of an unprecedented substituent effect on the diastereoselectivity of the MO(CO)(6) mediated allenic Pauson-Khand reaction. It was found that amino acid tethered allenynes with aromatic side chains afford alpha-alkylidene cyclopentenones with the opposite diastereoselectivity compared to those with aliphatic side chains. This effect has been attributed to complexation of the metal mediator to the aromatic ring in the substrate. Furthermore, an isomerization of one of the diastereomers of the a-alkylidene cyclopentenones was encountered, leading to eventual decomposition. The stable diastereomers were found to react well in the Stetter reaction leading to 1,4-diketones that were converted to pyrroles. The observation that the first generation of 2-alkyl-substituted pyrroles was unstable led to a second generation of 2-carboxamide pyrroles with sufficient stability for biological tests which are in progress.

  DOI：

  10.1021/jo0481607
• 作为产物：
  描述：

  2-benzoylamino-3-[2]thienyl-propionic acid 在 4-二甲氨基吡啶 、 三乙胺 、 N,N'-二环己基碳二亚胺 、 三苯基膦 作用下， 以 二氯甲烷 、 乙腈 为溶剂， 反应 27.25h， 生成 2-benzoylamino-2-(thien-2-yl)methylpenta-3,4-dienoic acid methyl ester
  参考文献：
  名称：

  Heterocyclic α-Alkylidene Cyclopentenones Obtained via a Pauson−Khand Reaction of Amino Acid Derived Allenynes. A Scope and Limitation Study Directed toward the Preparation of a Tricyclic Pyrrole Library

  摘要：

  [GRAPHICS]The synthesis of a novel class of tricyclic pyrroles has been accomplished by using a Pauson-Khand/Stetter/Paal-Knorr reaction sequence. Full details of the Pauson-Khand reaction of amino acid tethered allenynes 4a-e and 9a-d are disclosed. The study of this reaction led to the discovery of an unprecedented substituent effect on the diastereoselectivity of the MO(CO)(6) mediated allenic Pauson-Khand reaction. It was found that amino acid tethered allenynes with aromatic side chains afford alpha-alkylidene cyclopentenones with the opposite diastereoselectivity compared to those with aliphatic side chains. This effect has been attributed to complexation of the metal mediator to the aromatic ring in the substrate. Furthermore, an isomerization of one of the diastereomers of the a-alkylidene cyclopentenones was encountered, leading to eventual decomposition. The stable diastereomers were found to react well in the Stetter reaction leading to 1,4-diketones that were converted to pyrroles. The observation that the first generation of 2-alkyl-substituted pyrroles was unstable led to a second generation of 2-carboxamide pyrroles with sufficient stability for biological tests which are in progress.

  DOI：

  10.1021/jo0481607