dihydroalloxanthoxyletin | 521097-44-9

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 香豆素及其衍生物
• 英文名称: dihydroalloxanthoxyletin
• 英文别名: 3,4-dihydroalloxanthoxyletin；6-methoxy-8,8-dimethyl-9,10-dihydropyrano[3,2-f]chromen-3(8H)-one；5-methoxy-2,2-dimethyl-3,4-dihydro-2H-pyrano[2,3-f]chromen-8-one；5-Methoxy-2,2-dimethyl-3,4-dihydro-2H-pyrano[2,3-f]chromen-8-on；5-Methoxy-2,2-dimethyl-3,4-dihydropyrano[2,3-f]chromen-8-one
• CAS: 521097-44-9
• 化学式: C₁₅H₁₆O₄
• 分子量: 260.29
• InChiKey: CJDHCWMLGCBRCE-UHFFFAOYSA-N

物化性质

• 熔点：
  150-154 °C
• 沸点：
  431.6±45.0 °C(Predicted)
• 密度：
  1?+-.0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.9
• 重原子数：
  19
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  44.8
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  dihydroalloxanthoxyletin 在 2,3-二氯-5,6-二氰基-1,4-苯醌 作用下， 以 苯 为溶剂， 反应 4.0h， 以51%的产率得到別黃木素
  参考文献：
  名称：

  水中的5-甲氧芝麻素和四氧嘧啶无氧骨架的无催化剂一锅结构

  摘要：

  在回流水中且没有其他催化剂的情况下，富含电子的酚可能与炔酸或炔酸反应生成香豆素结构。可以在水性多组分反应中构建两种天然吡喃香豆素的骨架，即5-甲氧基水杨素和别氧蒽氧基letletanthoxyletin（总收率高达76％），其中将异戊二烯乙酸酯，丙酸和间苯三酚简单地混合并在水中回流。

  DOI：

  10.1021/ol401581p
• 作为产物：
  描述：

  3,3-二甲基丙烯酸 在 盐酸 、 palladium diacetate 、 氢氧化钾 、 甲酸 、 sodium acetate 、 potassium carbonate 、 zinc(II) chloride 、 锌 、 三氯氧磷 作用下， 以 乙醇 、 丙酮 为溶剂， 反应 52.0h， 生成 dihydroalloxanthoxyletin
  参考文献：
  名称：

  Atom Economy. Palladium-Catalyzed Formation of Coumarins by Addition of Phenols and Alkynoates via a Net C−H Insertion

  摘要：

  A strategy to achieve ortho substitution of phenols initiated by an ortho-palladation to create coumarins was examined. Indeed, treatment of alkynoates with electron-rich phenols in the presence of a palladium catalyst and an acid does generate coumarins. The scope of the reaction with respect to the phenol and the alkynoates is defined. With unsymmetrical aromatic substrates, generally good regioselectivity that reflects the HOMO coefficients can be observed. In the course of these studies, numerous important naturally occurring coumarins have been synthesized, including fraxinol methyl ether, ayapin, herniarin, xanthoxyletin, and alloxanthoxyletin. The fact that a Pd(0) is the precatalyst rather than a Pd(+2) species and that an acid that reduces Pd(+2) salts, formic acid, functions better than other carboxylic acids raises doubts about the initial working hypothesis. A novel mechanism involving a palladium phenoxide formed from a hydridopalladium carboxylate and phenol is invoked to rationalize the results.

  DOI：

  10.1021/ja0286573

文献信息

• Valorisation of phenols to coumarins through one-pot palladium-catalysed double C–H functionalizations
  作者：Giulia Brufani、Federica Valentini、Flavio Sabatelli、Benedetta Di Erasmo、Anastasiia M. Afanasenko、Chao-Jun Li、Luigi Vaccaro

  DOI：10.1039/d2gc03579k

  日期：——

  chemical production. Among the transformation of phenols, C–H functionalization is limited to a few examples with homogeneous metal-based catalysts. Herein, a robust one-pot approach for constructing C8 alkyl substituted coumarins starting from simple phenols through the palladium-catalysed double C–H functionalizations is presented. In such a combined protocol, a Pd/C was used as a heterogeneous catalyst

  酚类通过步骤和原子效率协议对于向可持续化学品生产的过渡非常重要。在酚类的转化中，C-H 官能化仅限于使用均相金属基催化剂的少数例子。本文提出了一种稳健的一锅法，用于从简单的酚类开始通过钯催化的双 C-H 官能化构建 C8 烷基取代的香豆素。在这样的组合方案中，Pd/C 首次用作非均相催化剂。所开发的方法能够使用潜在的生物质衍生酚以良好的分离产量合成结构多样的香豆素，包括天然产物。
• 320. Constituents of the bark of Zanthoxylum americanum(mill). Part V. The structure of alloxanthoxyletin
  作者：Alexander Robertson、T. S. Subramaniam

  DOI：10.1039/jr9370001545

  日期：——
• Atom Economy. Palladium-Catalyzed Formation of Coumarins by Addition of Phenols and Alkynoates via a Net C−H Insertion
  作者：Barry M. Trost、F. Dean Toste、Kevin Greenman

  DOI：10.1021/ja0286573

  日期：2003.4.1

  A strategy to achieve ortho substitution of phenols initiated by an ortho-palladation to create coumarins was examined. Indeed, treatment of alkynoates with electron-rich phenols in the presence of a palladium catalyst and an acid does generate coumarins. The scope of the reaction with respect to the phenol and the alkynoates is defined. With unsymmetrical aromatic substrates, generally good regioselectivity that reflects the HOMO coefficients can be observed. In the course of these studies, numerous important naturally occurring coumarins have been synthesized, including fraxinol methyl ether, ayapin, herniarin, xanthoxyletin, and alloxanthoxyletin. The fact that a Pd(0) is the precatalyst rather than a Pd(+2) species and that an acid that reduces Pd(+2) salts, formic acid, functions better than other carboxylic acids raises doubts about the initial working hypothesis. A novel mechanism involving a palladium phenoxide formed from a hydridopalladium carboxylate and phenol is invoked to rationalize the results.
• A Catalyst-Free One-Pot Construction of Skeletons of 5-Methoxyseselin and Alloxanthoxyletin in Water
  作者：Jin-Li Cao、Su-Li Shen、Peng Yang、Jin Qu

  DOI：10.1021/ol401581p

  日期：2013.8.2

  In refluxing water and without an additional catalyst, electron-rich phenols could react with alkynoic acids or alkynoates to provide coumarin structures. The skeletons of two natural pyranocoumarins, 5-methoxyseselin and alloxanthoxyletin, could be constructed (total yield up to 76%) in an aqueous multicomponent reaction in which isoprenyl acetate, propiolic acid, and phloroglucinol were simply mixed

  在回流水中且没有其他催化剂的情况下，富含电子的酚可能与炔酸或炔酸反应生成香豆素结构。可以在水性多组分反应中构建两种天然吡喃香豆素的骨架，即5-甲氧基水杨素和别氧蒽氧基letletanthoxyletin（总收率高达76％），其中将异戊二烯乙酸酯，丙酸和间苯三酚简单地混合并在水中回流。