7H-1,3-Dioxolo[4,5-h][2]benzopyran-9-ol,7-[6-[2-(dimethylamino)ethyl]-1,3-benzodioxol-5-yl]-6,9-dihydro- | 64550-61-4

• 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: 7H-1,3-Dioxolo[4,5-h][2]benzopyran-9-ol,7-[6-[2-(dimethylamino)ethyl]-1,3-benzodioxol-5-yl]-6,9-dihydro-
• 英文别名: 7-[6-(2-Dimethylamino-ethyl)-benzo[1,3]dioxol-5-yl]-6,9-dihydro-7H-[1,3]dioxolo[4,5-h]isochromen-9-ol
• CAS: 64550-61-4
• 化学式: C₂₁H₂₃NO₆
• 分子量: 385.417
• InChiKey: IXXBORNZQQECQY-UHFFFAOYSA-N

物化性质

• 沸点：
  525.6±50.0 °C(Predicted)
• 密度：
  1.357±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.55
• 重原子数：
  28.0
• 可旋转键数：
  4.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  69.62
• 氢给体数：
  1.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  7H-1,3-Dioxolo[4,5-h][2]benzopyran-9-ol,7-[6-[2-(dimethylamino)ethyl]-1,3-benzodioxol-5-yl]-6,9-dihydro- 在 pyridinium chlorochromate 作用下， 以 氯仿 为溶剂， 反应 0.5h， 生成 Peshawarin
  参考文献：
  名称：

  Reaction of Benzocyclobutene Oxides with Aldehydes: Synthesis of Peshawarine and Other 3,4-Dihydroisocoumarins

  摘要：

  Deprotonation of benzocyclobutenols 6 in the presence of aromatic aldehydes affords benzopyranols 7 in high yield. In the key step of this process, an o-tolualdehyde anion generated by the known ring-opening of benzocyclobutenoxides adds to the aldehyde to give 7 which is easily oxidized to 3-substituted 3,4-dihydroisocoumarins 8 including intermediates in some natural product syntheses. For example, reaction of 6-methoxybenzocyclobutenol (1) with LTMP and p-anisaldehyde gave in 96% yield the benzopyranol 16, which subsequently was converted to (+/-)-hydrangenol (17). Similar treatment of 1 with LDA and isovanillin benzyl ether afforded the benzopyranol 19 (87% yield) which already has been converted to (+/-)-phyllodulcin (21). Finally, reaction of 5,6-(methylenedioxy)-benzocyclobutenol (10) with LTMP and the aldehyde 26 (from treatment of hydrastinine with ClCO2-Me) followed by methanolysis produced the acetal 28 in 96% yield. The overall yield was 65% for the five-step synthesis of the alkaloid (+/-)-peshawawine (24) from 10 and 26. Extension of the process to aliphatic aldehydes was illustrated by the preparation of 32 from benzocyclobutenol and isobutyraldehyde in 69% overall yield after oxidation with PCC.

  DOI：

  10.1021/jo00094a022
• 作为产物：
  描述：

  5,6-(methylenedioxy)benzocyclobutenol 在 盐酸 、 lithium aluminium tetrahydride 、 硫酸 、 2,2,6,6-tetramethylpiperidinyl-lithium 作用下， 以 四氢呋喃 、 1,4-二氧六环 、 甲醇 为溶剂， 反应 10.0h， 生成 7H-1,3-Dioxolo[4,5-h][2]benzopyran-9-ol,7-[6-[2-(dimethylamino)ethyl]-1,3-benzodioxol-5-yl]-6,9-dihydro-
  参考文献：
  名称：

  Reaction of Benzocyclobutene Oxides with Aldehydes: Synthesis of Peshawarine and Other 3,4-Dihydroisocoumarins

  摘要：

  Deprotonation of benzocyclobutenols 6 in the presence of aromatic aldehydes affords benzopyranols 7 in high yield. In the key step of this process, an o-tolualdehyde anion generated by the known ring-opening of benzocyclobutenoxides adds to the aldehyde to give 7 which is easily oxidized to 3-substituted 3,4-dihydroisocoumarins 8 including intermediates in some natural product syntheses. For example, reaction of 6-methoxybenzocyclobutenol (1) with LTMP and p-anisaldehyde gave in 96% yield the benzopyranol 16, which subsequently was converted to (+/-)-hydrangenol (17). Similar treatment of 1 with LDA and isovanillin benzyl ether afforded the benzopyranol 19 (87% yield) which already has been converted to (+/-)-phyllodulcin (21). Finally, reaction of 5,6-(methylenedioxy)-benzocyclobutenol (10) with LTMP and the aldehyde 26 (from treatment of hydrastinine with ClCO2-Me) followed by methanolysis produced the acetal 28 in 96% yield. The overall yield was 65% for the five-step synthesis of the alkaloid (+/-)-peshawawine (24) from 10 and 26. Extension of the process to aliphatic aldehydes was illustrated by the preparation of 32 from benzocyclobutenol and isobutyraldehyde in 69% overall yield after oxidation with PCC.

  DOI：

  10.1021/jo00094a022