4-<(methoxycarbonyl)phenylmethyl>-3,4-dihydro-2H-benzopyran-2-one | 134593-94-5

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 3,4-二氢香豆素
• 英文名称: 4-<(methoxycarbonyl)phenylmethyl>-3,4-dihydro-2H-benzopyran-2-one
• 英文别名: methyl 2-(2-oxo-3,4-dihydrochromen-4-yl)-2-phenylacetate
• CAS: 134593-94-5
• 化学式: C₁₈H₁₆O₄
• 分子量: 296.323
• InChiKey: YSNHZMNOXOLUFK-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.04
• 重原子数：
  22.0
• 可旋转键数：
  3.0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  52.6
• 氢给体数：
  0.0
• 氢受体数：
  4.0

反应信息

• 作为产物：
  描述：

  香豆素 在 2,6-二甲基吡啶 作用下， 以 二氯甲烷 为溶剂， 反应 20.0h， 生成 4-<(methoxycarbonyl)phenylmethyl>-3,4-dihydro-2H-benzopyran-2-one
  参考文献：
  名称：

  Diels-Alder reactions of 2-[(trialkylsilyl)oxy]pyrylium cations of 2H-pyran-2-one and 2H-1-benzopyran-2-one derivatives

  摘要：

  The reactions of 6-methyl-2H-pyran-2-one and 2H-1-benzopyran-2-one with the 2-(trialkylsilyl)oxy dienes 6a-d in the presence of tert-butyldimethylsilyl triflate gave the [4 + 2] cycloadducts 7a-c and 8a-d regio- and stereoselectively in moderate yields. The ring junction in the cycloadducts is cis. The stereochemistry of 8a-d is discussed in terms of the H-1 NMR spectra of the compounds. Similar reactions of 3-(ethoxycarbonyl)-2-pyrones and 3-(alkoxycarbonyl)coumarins with the 2-(trialkylsilyl)oxy dienes 6a-e gave the cycloadducts 14-18 in satisfactory yields. Dehydrogenation of 7c, 8b, and 8c with DDQ in refluxing toluene afforded 23-25, respectively.

  DOI：

  10.1021/jo00017a014

文献信息

• Diels-Alder reactions of 2-[(trialkylsilyl)oxy]pyrylium cations of 2H-pyran-2-one and 2H-1-benzopyran-2-one derivatives
  作者：Katsuo Ohkata、Yong Gyun Lee、Yukinori Utsumi、Kenji Ishimaru、Kinya Akiba

  DOI：10.1021/jo00017a014

  日期：1991.8

  The reactions of 6-methyl-2H-pyran-2-one and 2H-1-benzopyran-2-one with the 2-(trialkylsilyl)oxy dienes 6a-d in the presence of tert-butyldimethylsilyl triflate gave the [4 + 2] cycloadducts 7a-c and 8a-d regio- and stereoselectively in moderate yields. The ring junction in the cycloadducts is cis. The stereochemistry of 8a-d is discussed in terms of the H-1 NMR spectra of the compounds. Similar reactions of 3-(ethoxycarbonyl)-2-pyrones and 3-(alkoxycarbonyl)coumarins with the 2-(trialkylsilyl)oxy dienes 6a-e gave the cycloadducts 14-18 in satisfactory yields. Dehydrogenation of 7c, 8b, and 8c with DDQ in refluxing toluene afforded 23-25, respectively.