4′-desmethoxykealiiquinone | 1572419-11-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡咯
• 英文名称: 4′-desmethoxykealiiquinone
• 英文别名: 6,7-dimethoxy-1-methyl-4-phenyl-1H-naphtho[2,3-d]imidazole-2,5,8-trione
• CAS: 1572419-11-4
• 化学式: C₂₀H₁₆N₂O₅
• 分子量: 364.357
• InChiKey: WHGNXHSRDUWKDN-UHFFFAOYSA-N

物化性质

• 密度：
  1.44±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.42
• 重原子数：
  27.0
• 可旋转键数：
  3.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.15
• 拓扑面积：
  90.39
• 氢给体数：
  1.0
• 氢受体数：
  6.0

反应信息

• 作为产物：
  描述：

  3-benzyl-6,7-dimethoxy-4-phenyl-1H-naphtho[2,3-d]imidazole-5,8-dione 在 N-氯代丁二酰亚胺 、 三氟甲磺酸 、 potassium carbonate 作用下， 以 四氢呋喃 、 乙腈 为溶剂， 反应 4.75h， 生成 4′-desmethoxykealiiquinone
  参考文献：
  名称：

  Total Synthesis of 7′-Desmethylkealiiquinone, 4′-Desmethoxykealiiquinone, and 2-Deoxykealiiquinone

  摘要：

  Synthetic approaches to the imidazonaphthoquinone core of kealiiquinone and related Leucetta-derived alkaloids are described. The polysubstituted benzimidazole framework can be constructed through intramolecular Diels-Alder reactions of propiolate-derived enynes followed by oxidation. Adjustment of the oxidation state of the thus formed lactone allows introduction of the 2,3-dihydroxybenzoquinone moiety through a presumed benzoin-like condensation between a phthaldehyde derivative and a masked glyoxal equivalent catalyzed by a cyanide ion. Oxidation of the C2-position can be accomplished through application of an operationally simple treatment of an imidazolium salt with bleach, thus producing the corresponding 2-imidazolone. Debenzylation of a late stage intermediate en route to kealiiquinone was compromised by concomitant O-demethylation upon treatment with triflic acid resulting in the formation of non-natural 7'-desmethylkealiiquinone. Other endgame strategies were evaluated; however, these efforts did not lead to completion of a synthesis of kealiiquinone but did provide access to other closely related analogues.

  DOI：

  10.1021/jo4027337