1H-benzo[f]isochroman-2(4H)-one

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 萘并吡喃类
• 英文名称: 1H-benzo[f]isochroman-2(4H)-one
• 英文别名: 1,4-Dihydrobenzo[f]isochromen-2-one；1,4-dihydrobenzo[f]isochromen-2-one
• 化学式: C₁₃H₁₀O₂
• 分子量: 198.221
• InChiKey: XRNQCNOCVWVCCX-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  15
• 可旋转键数：
  0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.15
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  1,3-dihydronaphtho[1,2-c]furan 、 碳酸二乙酯 在 lithium 作用下， 以 四氢呋喃 、 水 为溶剂， 反应 3.25h， 以42%的产率得到1H-benzo[f]isochroman-2(4H)-one
  参考文献：
  名称：

  Regiochemistry in the reductive opening of phthalan derivatives

  摘要：

  The lithiation of phthalan derivatives 4, 9 and 12 with an excess of lithium in the presence of a catalytic amount of 4,4'-ditert-butylbiphenyl (DTBB) in THF at -78 degrees C gives dianionic intermediates 5, 10 and 13, respectively, which by reaction with different electrophiles [H2O, tau-BuCHO, Me2CO, (EtO)(2)CO] at the same temperature, followed by hydrolysis, leads to regioselective functionalised naphthalenes 7, and biphenyls 11 and 14. The reductive opening takes place with high or total regioselectivity and can be explained considering the electron density in the dianion or in the radical anion, which are formed previous to the carbon-oxygen bond excision. The lithiation of the dihydrofurophthalan derivative 18 with the same reaction mixture but at higher temperature (0 degrees C) leads to intermediates 19 and 20, resulting from a single and a double reductive cleavage, respectively, which after addition of H2O and benzaldehyde as electrophiles gives a mixture of compounds 21 and 22. (c) 2007 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetlet.2007.03.069

文献信息

• Regiochemistry in the reductive opening of phthalan derivatives
  作者：Francisco Foubelo、Daniel García、Benjamín Moreno、Miguel Yus

  DOI：10.1016/j.tetlet.2007.03.069

  日期：2007.5

  The lithiation of phthalan derivatives 4, 9 and 12 with an excess of lithium in the presence of a catalytic amount of 4,4'-ditert-butylbiphenyl (DTBB) in THF at -78 degrees C gives dianionic intermediates 5, 10 and 13, respectively, which by reaction with different electrophiles [H2O, tau-BuCHO, Me2CO, (EtO)(2)CO] at the same temperature, followed by hydrolysis, leads to regioselective functionalised naphthalenes 7, and biphenyls 11 and 14. The reductive opening takes place with high or total regioselectivity and can be explained considering the electron density in the dianion or in the radical anion, which are formed previous to the carbon-oxygen bond excision. The lithiation of the dihydrofurophthalan derivative 18 with the same reaction mixture but at higher temperature (0 degrees C) leads to intermediates 19 and 20, resulting from a single and a double reductive cleavage, respectively, which after addition of H2O and benzaldehyde as electrophiles gives a mixture of compounds 21 and 22. (c) 2007 Elsevier Ltd. All rights reserved.
• Regioselective reductive opening of substituted phthalans: synthetic applications
  作者：Daniel García、Francisco Foubelo、Miguel Yus

  DOI：10.1016/j.tet.2008.02.072

  日期：2008.5

  The reductive opening of substituted phthalans 6, 11, 12, 20, 21 and 28 with lithium and a catalytic amount of DTBB leads to the formation of corresponding functionalised organolithium intermediates 8, 15, 16, 23, 25 and 29+30 in a regioselective manner. The further reaction of these dianions with different electrophiles, mainly carbonyl compounds, gives the expected functionalised benzylic alcohols 9, 17, 18, 24, 26 and 31+32. The observed stereochemistry can be easily explained taking into account the values of the electron densities deduced by semiempirical PM3 calculations. (c) 2008 Elsevier Ltd. All rights reserved.