2-ethyl-4H-1-benzopyran-3-carboxylic acid methyl ester

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 英文名称: 2-ethyl-4H-1-benzopyran-3-carboxylic acid methyl ester
• 英文别名: methyl 2-ethyl-4H-chromene-3-carboxylate
• 化学式: C₁₃H₁₄O₃
• 分子量: 218.252
• InChiKey: CCSXOGHIXSFCDS-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  16
• 可旋转键数：
  3
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.31
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  2-(2-Bromo-benzyl)-3-oxo-pentanoic acid methyl ester 在 copper(l) iodide 、 caesium carbonate 作用下， 以 四氢呋喃 为溶剂， 反应 3.0h， 以99%的产率得到2-ethyl-4H-1-benzopyran-3-carboxylic acid methyl ester
  参考文献：
  名称：

  O-Arylation versus C-Arylation:  Copper-Catalyzed Intramolecular Coupling of Aryl Bromides with 1,3-Dicarbonyls

  摘要：

  The copper-catalyzed intramolecular coupling of aryl bromides with 1,3-dicarbonyls via a six-membered ring closure was examined. With CuI (10 mol %) as the catalyst, N,N'-dimethylethylenediamine as the ligand, and Cs2CO3 as the base, the reactions of alpha-(2-bromobenzyl)-beta-keto esters in THF at refluxing temperature afforded the corresponding substituted 4H-1-benzopyrans in high yields via O-arylation. On the other hand, the reactions of delta-(2-bromophenyl)-beta-keto esters in refluxing dioxane led to the formation of 3,4-dihydronaphthalen-2(1H)-one derivatives via C-arylation.

  DOI：

  10.1021/jo060747t

文献信息

• Cu(I)-Catalyzed Domino Reactions: Efficient and Selective Synthesis of 4<i>H</i>-Chromenes and Naphthalenes
  作者：Chandi C. Malakar、Dietmar Schmidt、Jürgen Conrad、Uwe Beifuss

  DOI：10.1021/ol200347g

  日期：2011.4.15

  Depending on the ratio of the substrates and the reaction conditions, the Cu(I)-catalyzed domino reaction between bromobenzyl bromides and beta-ketoesters exclusively yields either 4H-chromenes or naphthalenes.
• O-Arylation versus C-Arylation:  Copper-Catalyzed Intramolecular Coupling of Aryl Bromides with 1,3-Dicarbonyls
  作者：Yewen Fang、Chaozhong Li

  DOI：10.1021/jo060747t

  日期：2006.8.1

  The copper-catalyzed intramolecular coupling of aryl bromides with 1,3-dicarbonyls via a six-membered ring closure was examined. With CuI (10 mol %) as the catalyst, N,N'-dimethylethylenediamine as the ligand, and Cs2CO3 as the base, the reactions of alpha-(2-bromobenzyl)-beta-keto esters in THF at refluxing temperature afforded the corresponding substituted 4H-1-benzopyrans in high yields via O-arylation. On the other hand, the reactions of delta-(2-bromophenyl)-beta-keto esters in refluxing dioxane led to the formation of 3,4-dihydronaphthalen-2(1H)-one derivatives via C-arylation.